Method for preparing polymeric monodispersed particles by suspension polymerization and unit for its realization


FIELD: chemistry of polymers, chemical technology.

SUBSTANCE: invention relates to technology for producing granules used in preparing ion-exchange resins. Invention describes a method for producing polymeric monodispersed particles by suspension polymerization and involves the following steps: preparing monodispersed drops by adding a drop-forming device for preparing an aqueous dispersion medium into a chamber that formed the continuous phase, ejection of monomer hydrophobic liquid to aqueous dispersion medium through draw plate holes up under effect of regular vibration to form monomer liquid drops of a equal size preferably in aqueous dispersion medium; carrying out preliminary polymerization by adding prepared monomer liquid drops in aqueous dispersion medium into the first reactor, carrying out the polymerization reaction in a quasi-liquid layer to prepared suspension of partially polymerized drops of monomer in aqueous dispersion medium to degree when drops can't fuse or break; carrying out the final suspension polymerization at intensive stirring in the second reactor; at step for preparing monodispersed drops an aqueous dispersion medium is added to the form-forming device chamber at temperature 60-90°C, and monomer hydrophobic liquid is added into the drop-forming device at temperature 5-25°C or at environment temperature. Invention provides expanding zone for monodispersing drops of hydrophobic monomeric liquid in the drop-forming device allowing to vary sizes of prepared monodrops, and technical and technological simplifying the unit device.

EFFECT: improved producing method.

13 cl, 7 dwg, 1 ex

 

The invention relates to the production technology of polymer granules used to obtain ion-exchange resins.

Production of monodisperse copolymer particles includes a stage of generation of monodisperse droplets and carrying out suspension polymerization, which is usually performed in two stages: preliminary polymerization monocoil in an aqueous dispersion medium and the final polymerization in a separate apparatus with getting monotermicheskih granules.

A known method of generating monodisperse droplets in Bupleurum device (patent US 5 380 496, 08 F 2/20, 01 F 13/00, publ. 10.01.1995), carried out by feeding in caplease device aqueous dispersion medium, the ejection it through a die plate having at least one hole, a hydrophobic liquid monomer under the action of regular vibrations to the liquid monomer droplets predominantly of equal size. At the same time as the aqueous dispersion medium can be used water-insoluble inorganic salt or mixtures thereof, such as calcium phosphate, calcium carbonate, etc. and as a Monomeric liquid - monovinyl and di - and triphenylene compounds, examples of which include styrene, divinylbenzene, esters and NITRILES of acrylic and methacrylic acids, and mixtures thereof.

This method provides moznosti create the conditions for the formation of the jets, when in Bupleurum device generates a region of formation of droplets of equal size. These conditions are the flow rate of the liquid monomer, the frequency and amplitude of vibration.

Next, the resulting monocable in the aqueous dispersion medium is directed to the first reactor for partial polymerization and then in a second reactor for final suspension polymerization.

The method is designed primarily to obtain particles of relatively large size - 1,0-0,5 mm

On the chemical-physical nature of the process, the closest one is the method of generating droplets (patent US 5 061 741, 08 L 25/00, 08 F 2/04, 08 F 2/00, publ. 29.10.1991), including the filing with the camera cableamerica device aqueous dispersion medium containing a dispersion stabilizer and forming a continuous phase, the ejection in the aqueous dispersion medium is hydrophobic liquid monomer through the many holes of the nozzle jets upwards under the action of vibration or without for the formation of liquid droplets of the monomer mainly of equal size in the aqueous dispersion medium, having a density less than the density of the aqueous dispersion medium. In the stabilizer is used as water-insoluble inorganic salt or substances that form in water, a colloidal solution, such as karboksimetilcelljuloza, polyvine the new alcohol, gelatin or starch, etc. as Monomeric liquid is usually used styrene, esters or NITRILES of acrylic and methacrylic acid, divinylbenzene, divinely ether of diethylene glycol or their mixtures in different ratios and peroxide (e.g. benzoyl peroxide) as an initiator. The aqueous dispersion medium and the liquid monomer is served in caplease device at equal temperatures of both streams from 0 to 40°and in the camera drop set temperature 20-25°C. Receive drops of equal size in the range of 0.3-1.0 mm

Further polymerization of the obtained monodisperse droplets is carried out in the first reactor with partial polymerization of the monomer droplets in the second reactor to obtain the desired product. The process is conducted under stirring in both reactors.

The main disadvantage of this method is that when filing, monomer liquid and the aqueous dispersion medium with equal temperature of both streams in Bupleurum device generates a fairly narrow range of velocity to the expiration of the monomer and the vibration frequency, which produces a very narrow zone of formation of droplets of equal size. A narrow zone monodispersive drops does not allow monocable different sizes on the same filiere. If you need to get monocoil another dimension come is seeking to replace the Spinneret.

The task of the method of generating droplets is the expansion of monodispersive drops hydrophobic monomer liquid in Bupleurum device that allows you to vary the sizes of received monocoil on one filiere the change of vibration frequency or speed of expiration, as well as to optimize the process and increase the efficiency cableamerica device. In addition, at the stage of polymerization seeks to simplify the process at the stage of partial polymerization in the first reactor.

The problem is solved by applying a method of generating monodisperse droplets, comprising feeding into the chamber cableamerica device aqueous dispersion medium containing a dispersion stabilizer and forming a continuous phase, the ejection in the aqueous dispersion medium is hydrophobic liquid monomer through the holes of the nozzle jets upwards under the action of regular vibration for the formation of liquid droplets of the monomer mainly of equal size in the aqueous dispersion medium, which offers a water dispersion medium is introduced into the chamber cableamerica device at an elevated temperature, and the hydrophobic liquid monomer to enter into the camera cableamerica device at low temperature or ambient temperature.

When this aqueous dispersion medium in which W ill result in caplease device at a temperature of from 60 to 90° With and hydrophobic liquid monomer is injected at a temperature of from 5 to 25°C.

And the temperature in the chamber cableamerica device installed within 40-60°C.

In addition, at the stage of formation of the drops as a stabilizer of the droplets in the aqueous dispersion medium used methylhydroxyethylcellulose at a concentration of from 0.05 to 0.2% of the volume of the aqueous dispersion medium.

And the ratio of the volume of the hydrophobic liquid monomer to the aqueous dispersion medium is from 1:1 to 1:3, respectively, at all stages.

And when the linear velocity of the expiration of the jet monomer in aqueous dispersion stream in the range from 1.2 to 2.2 m/sec regular vibration in Bupleurum device are at a frequency in the range from 500 to 1500 Hz.

Characteristic also is the controlling process of the formation of liquid monomer droplets by visualization using optical-digital complex.

In this invention as the physical basis for the generation of drops used known method of stimulated capillary jet breakup (VCRS), which lies in the fact that the jet hydrophobic liquid when introduced into the aquatic environment through hole is subjected to vibration activating an external source of vibration with a frequency corresponding to the resonant decay of the jet with the formation of the column drops equal to RA is a measure in the aquatic environment (photo on figa). The process can be visualized using optical-digital complex. Conditions for the hydrodynamic regime, in which are formed Monomeric droplets of equal size in a continuous phase aqueous dispersion medium include a number of characteristics, among which are the flow velocity of the jets of the monomer and the vibration frequency. According to patent US 5 380 496 equally important characteristic is the amplitude of the vibration.

However, the task of the known methods is only finding the area of monodispersive to establish a stable working hydrodynamic mode.

In contrast to the known methods, it is found experimentally that the resistance mode monodispersive increases in a wide range of frequencies of vibration and the speed of the expiration of the jet monomer, if dispersible and continuous phases have different temperature. It was found that the optimal combination is lowered temperature of the monomer 5-25°and high temperature water of the dispersion medium 60-90°C. On figa shown hatched area sustainable mode monodispersive at equal temperatures of both phases 20°C. On figb shows the area monodispersive when the temperature of the mixture of monomers 20°and aqueous dispersion medium 78°C, while the temperature in the chamber to preobrazuemogo device was 44° C.

As seen on figa and 2B frequency range of monodispersive is within 420-500 Hz at equal temperatures of both phases and within 500-1130 Hz at different temperatures of the phases. Also somewhat increases the interval velocity of the expiration of the monomer while maintaining monodisperse mode. This allows the second case to smoothly adjust the diameter of the droplets on the filter hole diameter, for example, 200 μm in the range from 0.4 to 0.58 mm, and significantly increases the stability of the process with different process variations of process parameters. On figb given stroboscopically displayed pictures made with optical-digital complex. Pictures obtained in the same conditions with the only variable parameter is the frequency of vibration. Frequency is indicated above each column. In this process when monodisperse mode, one cycle of the vibrator corresponds to the formation of a single drop. Therefore, when the constant speed of the expiration of the jet increased frequency vibration reduces the diameter of the drops and increases their number per unit time, as shown in figb. Lowering the temperature of the mixture of monomers, on the one hand, allows to reduce the polymerization in the area of the Spinneret holes and extend their services from cleaning to cleaning, and, on the other hand, increases the viscosity of the resulting structure is. The simultaneous increase in the viscosity of the jet of the mixture of monomers and lowering the viscosity of the heated aqueous dispersion medium and the heat exchange between them create hydrodynamic conditions for expansion zone monodispersive drops. When the temperature drops Monomeric liquid below 5°increases the danger of excessive cooling of the water environment and the formation of stagnant zones in the camera drop, and when the temperature rises above 25°With accelerated growth of the Spinneret holes. It is found experimentally that the optimum temperature of the mixture of monomers is in the range from 5 to 25°better from 10 to 15°C. In the selection of combinations of temperature continuous and Monomeric phase region monodispersive drops can be extended in the frequency range from 500 to 1500 Hz. Visual observation of the process monodispersive drops, controlling borders of monodispersive, operational control parameters hydrodynamic regime: frequency vibration, flow rate of the monomer and the flow temperatures of both phases is in the on-line mode using optical-digital complex (BCC), whose schema is shown in figure 3.

As the monomer mixture is used, the composition comprising monovinyl connection - styrene in the amount of 80-85%, polyvinylene connection - divinyl Sol 7-10% and atillery 5-8%, and benzoyl peroxide 0,3-0,6% as an initiator. The presence of di - and trivinyl crosslinking agents in the mixture provides resistance patterns get drops when they are soft stirring in the fluidized bed, since the viscoelastic behavior of the droplets is achieved with a small (3-10%) degree of conversion already at the initial stage of polymerization.

As the dispersion stabilizer obtained monomer droplets can be used water-insoluble inorganic salts and their mixtures or compounds forming with water a colloidal solutions are chosen depending on the required conditions, providing the density of the aqueous dispersion medium, sufficient to create the conditions for fluidized bed (back fluidized layer in relation to the density of the monomer. To apply a mixture of monomers as the optimal stabilizer selected methylhydroxyethylcellulose, mark EUMM - 8000, industrial name culminal. The optimal concentration of the solution culminal for various stages of the formation of droplets and their polymerization. On stage, drop the minimum concentration of culminal is 0.05%. At a lower concentration to disrupt the stability of emulsion droplets stick. The maximum concentration of 0.2%, since at higher its value increases the viscosity of the aqueous dispersion medium and decrased the frequency range zone monodispersive. The concentration of culminal to 0.2% ensures the stability of the emulsion under the conditions of polymerization.

A device for carrying out suspension polymerization (patent US 4870143, 08 F 2/20 08 F 12/08, publ. 26.09.1989), which contains caplease device, through which the supply line is supplied Monomeric liquid and through the holes of the die with the formation of droplets of equal size is introduced into the aqueous dispersion medium is introduced into the device through the supply line; the reactor tower with a conical upper and lower parts, containing an inlet opening at the top for the introduction and formation flow down the water dispersion medium and an outlet opening at the bottom to its conclusion, the circulation line connected to the outlet for removing the aqueous dispersion medium and circulating it into the inlet, the supply line suspension liquid droplets of monomer in the aqueous dispersion medium, connected to the circulation line at the top, and the line formed by removing the polymer particles in the aqueous dispersion medium. In such a device the process of suspension polymerization is carried out in one apparatus due to the circulation line.

Most similar to that proposed by the instrumental composition is a plant for the production of polymer particles of equal size suspension poly is arizala (patent US 5 380 496, 08 F 2/20, 01 F 13/00, publ. 10.01.1995), including:

device the formation of droplets containing at least one die plate with at least one aperture through which passes the liquid monomer, having a density less than the density of the aqueous dispersion medium, and a device for vibration Monomeric liquid when passing through the pores, in which caplease the device also includes a line of circulation of the aqueous dispersion medium for contacting the aqueous dispersion medium with drops in counterflow;

the first reactor containing the entrance for the introduction of the aqueous dispersion medium containing the formed droplets; means for circulating the aqueous dispersion medium from the lower to the upper part of the reactor; means for mixing the aqueous dispersion medium containing droplets; and an output for outputting a liquid dispersion medium with partially polymerized droplets; the reactor is partially polimerizuet liquid droplets of the monomer introduced from cableamerica device so that the density of droplets does not exceed the density of the aqueous dispersion medium at a given temperature of polymerization; and

the second reactor, containing the entrance for the introduction of a partially polymerized droplets, the output from the first reactor to the second reactor, and means for mixing the droplets and the aqueous dispersion is ionic environment for further polymerization.

The disadvantages of the device include the use of circulation water of the dispersion medium in the first reactor, requiring the installation of additional equipment in the form of tanks, pumps, heat exchangers and control devices, flow and temperature in the circulation line. Furthermore, the presence of line circulation complicates the separation of the droplets produced directly from the bottom of the first reactor.

Thus, the object of the invention to device setup for the suspension polymerization is its technical and technological simplification by eliminating from its loop bypass line circulation water of the dispersion medium.

The problem is solved by the use of plants for the production of monodisperse polymer particles by suspension polymerization, comprising: caplease device containing the camera for the formation of monodisperse droplets, the die plate with many holes for ejection of jets hydrophobic liquid monomer, a means for vibration when the ejection of jets, as well as access to a supply of water of the dispersion medium above the die, the input line of the introduction of hydrophobic liquid monomer below the die and the exit in the upper part of the chamber for removal of the emulsion formed droplets of monomer in the aqueous dispersion medium; a first reactor containing WMO is at the top for introducing the emulsion formed droplets of monomer in the aqueous dispersion medium, and the output in the lower part for the conclusion of the suspension of partially polymerized monomer droplets in the aqueous dispersion medium; and a second reactor containing the entrance for introducing a suspension of partially polymerized monomer droplets in the aqueous dispersion medium, a means for mixing the suspension and an outlet for removal of the target product, the first digester is made in the form of at least one tubular cylindrical body with a tapered upper and lower parts, with a ratio of length to diameter of at least 20:1, respectively.

The ratio of length to diameter of the first reactor is preferably (100-500):1 respectively.

And a tubular cylindrical body of the first reactor is made divided by internal partitions into sections.

And the conical upper and lower part of the body have a cone angle of not more than 30°.

The first reactor is made in the form of a cascade of series-connected buildings with a uniform vertical displacement of successive buildings down relative to each other.

In addition, caplease the device is equipped with means for regulating the temperature of the aqueous dispersion medium and Monomeric liquid introduced into the line supply.

A distinctive feature is that in caplease the device part of the CTE is key camera over Villeroy made transparent and it is equipped with optical-digital system for visual monitoring of the process drop which includes a video camera, set against a transparent part of a wall, connected to the video display, strobe illuminator, set against a transparent part of a wall, connected through a frequency divider with a frequency generator and a vibrator.

The process of partial polymerization is based on carrying out the polymerization of the obtained monomer droplets by gentle mixing in a fluidized bed (reverse boiling) layer generated by the water flow of the dispersion medium (GVA) from top to bottom through the inverse fluidized bed droplets formed due to their lower density and buoyancy that makes them up. Such soft mixing does not destroy the membrane of the stabilizer on the surface of the droplets and therefore do not merge and split. Soft mixing terpolymerization made up until droplets during polymerization will not lose fluidity and stickiness, i.e. to the degree of conversion of from 3 to 10% (in the presence of di - and trivinyl components in the mixture of monomers)at which the viscosity of the droplets is high enough to further mixing only they could keep their shape. Optimal conditions of polymerization and soft mixing terpolymerization are created by the combination of the following factors:

temperature terpolymerization 72-85°C;

the concentration of stabilizer is the Torah (culminal) in the aqueous dispersion medium -0,2± 0,05% of the total GVA;

the concentration of the polyvinyl monomer is 4-20% of the total weight of monomers;

the concentration of initiator (benzoyl peroxide) in a mixture of monomers 0,3-0,6 %;

- the ratio of the volume of monomer droplets and GVA 1:(1-3);

- feed rate of GVA per empty section of the cylindrical tubular reactor 9 to 15 m/h.

The heating temperature of the emulsion affects the residence time of the droplets in terpolymerization. Found that at a temperature of 75°With a stay must be between 82 to 152 min, at 80°With a residence time of from 40 to 108 min, 82,5°With the time from 26 to 90 min at 85°With the time from 19 to 74 minutes

However, at low temperature and long residence time of the droplets in terpolymerization decreases the efficiency of the process.

While at high temperature and low residence time of the droplets in terpolymerization exothermic process can become difficult to manage, that can lead to boiling and emissions of the reaction mass.

The optimal combination of temperature and residence time of the droplets with the desired degree of conversion of partial polymerization are the temperature of 80-82°and With a residence time of from 40 to 110 minutes

Thus, to achieve the desired degree of conversion of all monomer droplets in the process of terpolymerization every drop must be in what erom reactor from 40 to 110 minutes This is achieved by increasing the length of the tubular reactor apparatus. It is established that to achieve the required conditions, the length of the device to exceed its diameter is not less than 20 times, possibly up to 500 times and preferably may range (100-500):1.

Therefore, to implement a process terpolymerization offers a simple form of the first reactor in the form of an elongated tubular apparatus (body), which can be divided into partitions internal partitions with holes that prevent backward slippage of the suspension and guide the thread down.

The partitioning of the tubular apparatus terpolymerization carried out by performing in one long tubular housing sections by establishing internal partitions with a hole, as shown in figa to provide a mostly one-way traffic emulsion, without reverse current or one long tubular apparatus is carried out in a cascade of multiple buildings, each of which has a conical upper and lower part (5B). In such buildings can also be performed by internal partitions (5V).

Thus, by lengthening the hull of the first reactor and its sectionrowindex possible to avoid circulation of the solution stabilisatoren on the bypass line and the use of additional process equipment on stage, h is a partial suspension polymerization.

The invention is illustrated the accompanying drawings.

On figa given image columns monocoil formed from jets monomer under the action of regular vibration.

On figb shows the variation in droplet size when changing frequency vibromassage. Frequency in Hz are listed in the upper part of each bar drops.

On figa chart shows zone monodispersive at the same temperature flow of the monomer and the aqueous dispersion medium - 22°C.

On figb shows the same chart, but at different temperatures flow: water dispersion medium - 78°for monomer - 20°C.

Figure 3 - schematic representation cableamerica device and optical-digital system for visual monitoring of the process of dripping.

Figure 4 - schematic diagram of installation for the production of monodisperse particles in a continuous mode.

Figure 5 - schematic partition of the first reactor (terpolymerization).

Presented on figure 3 caplease device 1 includes a camera 2 generation of droplets at the bottom of which there is filler 3 with many holes. The chamber 2 has an inlet for feed water of the dispersion medium above the die and the input feed of the mixture of monomers below the Spinneret. At the top of the device 1 has an outlet for draining the obtained emulsion droplets monomial is RA in the aqueous dispersion medium. Under the camera 2 is placed the vibrator 4, connected to the frequency generator 5. Part of the walls of the chamber 2 above Villeroy 3 made of a transparent circular window 6, against which one side of the video camera 7 is connected to the video display 8, and on the other hand has stratoshpere illuminator 9, connected through a divider 10 frequency frequency generator 5.

4 shows schematic diagram of installation for the production of monodisperse particles in a continuous mode. The installation includes caplease device 1 containing the die plate 3 with lots of holes and the vibrator 4. Through the entrance above the die 3 in the device served aqueous dispersion medium containing a dispersion stabilizer, from the tank 11 by a pump 12 through the expansion device 13. And through the entrance below the die 3 in the unit is a liquid containing a mixture of monomers from the tank 14 by a pump 15 through expansion device 16. The resulting suspension of monomer droplets in the aqueous dispersion medium via the top of the device 1 is at the stage of preliminary polymerization in the first reactor 17 (terpolymerization) through expansion device 18. And in the first reactor 17 is served aqueous dispersion medium from the tank 19 by a pump 20. The first reactor is made in the same Tr is bcatid housings 17, serially connected to each other in cascade. From the last case of the cascade suspension of partially polymerized droplets is directed to the second reactor at the final suspension polymerization and processing of the finished particles. The second reactor can be made of two reactors 21-22 with mixing devices.

Figure 5 presents options for construction of the first reactor. The reactor can be made of multiple sections in a single tubular housing (option a) in the form of multiple series-connected tubular sections, each of which has a conical top and bottom (option b). As well as buildings themselves can be partitioned and evenly vertically shifted down relative to each other to ensure the flow of suspension by gravity due to the difference of levels of the buildings.

Method of preparation of monodisperse polymer particles, such as granules copolymers for the production of ion exchange resins, as follows.

Example 1.

The mixture of monomers from the tank 14 (figure 4) by the pump 15 through the heat exchanger 16 is dosed in an amount of 28 ml/min at a temperature of 18 -20°With the camera 2 cableamerica device 1 under the die plate 3. In the composition of the mixture using a styrene - 83,5%, divinylbenzene - 8%, atistical - 8% benzoyl peroxide and 0.5%. The aqueous dispersion medium is 0.1% aqueous the solution of the stabilizer - methylhydroxyethylcellulose (culminal) in the amount of 33 ml/min at a temperature of 78°from tank 11 by pump 12 through the heat exchanger 13 is dosed into the chamber 2 cableamerica device 1 in the space above Villeroy 3. Excited vibration from electrodynamic vibrator 4 at a frequency of 900 Hz jet of a mixture of monomers agentized through the holes of the die 3 up in an aqueous dispersion medium, where the decay into monodisperse droplets in the aqueous dispersion medium, forming an emulsion. Filler 3 has 8 holes with a diameter of 0.2 mm, in which the channel length is equal to the diameter of the hole. The transparent part of the wall - viewing window 6 (3) camera 2 allows you to record using the video camera 7 technological mode drop when illuminated by the strobe 9 and visually see it on the screen of the video display 8. The frequency of the strobe 9 is selected multiple of the frequency of excitation of the jets of the mixture of monomers with the help of divider 10 frequency, which allows to cover the area of the drop and get the image recorded by the camera 7, each 4, 8, 16, or 32 drops. At the same time on the monitor screen there is a picture shown in figure 1. Thanks to the regularity of (resonance) process each subsequent drop is in space and time in the same place as the previous drop, making the picture on mon the Torah is constant (frozen). When this mode is formed column drops up to 10 mm When the violation mode, the column is missing or is not monodisperse (the appearance of small satellite droplets fused droplets and the like).

Thus, the visualization device in the form of optical-digital complex allows on-line control of flow rate and flow velocity of the mixture of monomers, the frequency of vibration, temperature of both streams (solution stabilizer and a mixture of monomers), etc. and maintain the conditions in the area of monodispersive.

Due to the temperature difference between the flow of the mixture of monomers and a solution of culminal area monodispersive greatly expanded, as shown in figb that allows you to change the size of the droplets, changing the frequency and the speed of feed of the mixture of monomers in the range of drop diameters from 0.4 to 0.58 mm, when the diameter of the hole Spinneret, equal to 0.2 mm (figb). At the output of cableamerica device 1 to the emulsion continuously added to a 0.5%solution of the stabilizer in the amount of 12-15 ml/min, so that the concentration of culminal in the aqueous dispersion medium after mixing with the emulsion was 0,15-0,25%, after which the emulsion obtained is heated by the heat exchanger 18 to a temperature of 75-78°C. as the heat exchanger may be used first housing terpolymerization 17, which in this case is heated with hot water the temperature up to 120° C.

The process is carried out by continuously passing the reaction mixture through the multitude of series-connected buildings of the first reactor, providing a residence time therein of monodisperse drops 40-110 minutes

To carry out a continuous process of terpolymerization was used the apparatus of the 4 tubular housings 17 (figure 4) with an inner diameter of 25 mm single section length 3 meters of Housing are connected by tubes and vertically offset relative to each other for flow of the polymerized emulsion sequentially from the 1st to the 4th corps of gravity due to the differential housings 150 mm (figb). All buildings are situated in a common housing and are heated by hot water 75-76°C. the residence Time of the droplets in terpolymerization 40-110 min, the degree of conversion of up to 20%. Partially polymerized droplets with a diameter of 0.48 mm at the exit of terpolymerization have viscoelastic state and not capable of crushing or coalescence. To prevent leakage neapolitani drops used, on the one hand, the partitioning of the hull, the use of 2 or more buildings, and, on the other hand, the use of long lengths of casing to its diameter (100-500):1.

In a reactor provided is of uniform cross-section (without bypass flows) boiling drops, for which the conditional linear velocity of the aqueous phase (without taking into account the volumes of the and drops monomers) is from 9 to 15 m/h, and the angle of taper of the upper and lower parts of the machine not more than 30°avoid stagnant zones at the inlet and outlet mass from the reactor).

With this construction, the first reactor temperature change in sections due to the heat of reaction does not exceed 1°i.e. able to dissipate heat without the use of a heat exchanger in the line of recycling and receive a partial polymerization of the droplets with the degree of transformation (conversion) up to 10-20%.

At the outlet of the reaction mixture from the first reactor 17 drops due to the polymerization process when the selected conditions are viscoelastic, not capable of crushing and agglomeration. The degree of polymerization less than 20% and, therefore, more than 80% of the heat of reaction is allocated in the second reactor. The amount of heat of polymerization for the most commonly used mixture of styrene and divinylbenzene is that causes boiling of the reaction mass and dangerous pressure increase in the apparatus. Therefore, in the second reactor for the intensification of heat exchange is required to provide strong stirring and at this stage used a standard reactor with mechanical stirring.

The second reactor is divided at least into two sections.

In the first section 21 temperature is between 72-82°and the degree of polymerization of up to ˜90%.

In the second section 22, the temperature of the support is carried out more than 90° And the polymerization is completed to the degree of conversion of greater than 99%.

The copolymers produced by this technology and with the use of the proposed equipment, used for the production of ion exchange resins (cation and anion)with enhanced properties on the durability of pellets in operating conditions and low hydraulic resistance of the filter.

Ensuring an even rate of filtration over the whole cross section, filters, loaded the monodisperse ion exchangers, have increased by 20% sorption capacity before breakthrough and reduce regenerating substances by 20% compared with filters loaded polydisperse ion exchange resins.

1. Method for the production of monodisperse polymer particles by suspension polymerization, which includes stages: preparation of monodisperse droplets by introducing into the chamber cableamerica device aqueous dispersion medium containing a dispersion stabilizer and forming a continuous phase, the ejection in the aqueous dispersion medium is hydrophobic liquid monomer through the holes of the nozzle jets upwards under the action of regular vibration for the formation of liquid droplets of the monomer mainly of equal size in the aqueous dispersion medium; the preliminary polymerization is injected into the first reactor recip is the R liquid droplets of monomer in the aqueous dispersion medium, carrying out polymerization in the fluidized bed with taking the suspension of partially polymerized monomer droplets in the aqueous dispersion medium to such an extent that the droplets cannot be discharged or broken; the final suspension polymerization with vigorous stirring in the second reactor, characterized in that at the stage of preparation of monodisperse droplets of aqueous disperse medium is injected into the chamber cableamerica device at a temperature of 60-90°and a hydrophobic liquid monomer is introduced into the chamber cableamerica device at a temperature of 5-25°or the ambient temperature.

2. The method according to claim 1, characterized in that the temperature in the chamber cableamerica device installed within 40-60°C.

3. The method according to claim 1, characterized in that at the stage of formation of the drops as a stabilizer of the droplets in the aqueous dispersion medium used methylhydroxyethylcellulose at a concentration of from 0.05 to 0.2% of the volume of the aqueous dispersion medium.

4. The method according to claim 1, characterized in that the ratio of the volume of the hydrophobic liquid monomer to the aqueous dispersion medium is from 1:1 to 1:3, respectively, at all stages.

5. The method according to claim 1, characterized in that the linear speed of the expiration of the jet monomer in an aqueous dispersion medium in the range from 1.2 to 2.2 m/s R is regular vibration in Bupleurum device are at a frequency in the range from 500 to 1500 Hz.

6. The method according to claim 1, characterized in that the control process of the formation of droplets by visualization using optical-digital complex.

7. Installation for the production of monodisperse polymer particles by suspension polymerization, including caplease device containing the camera for the formation of monodisperse droplets, the die plate with many holes for ejection of jets hydrophobic liquid monomer, a means for vibration when the ejection of jets, as well as access to a supply of water of the dispersion medium above the die, the input line of the introduction of hydrophobic liquid monomer below the die and the exit in the upper part of the chamber for removal of the emulsion formed droplets of monomer in the aqueous dispersion medium;

the first reactor containing the entrance at the top for introducing the emulsion droplets of monomer in the aqueous dispersion medium, and an outlet at the bottom for withdrawal of the suspension of partially polymerized monomer droplets in the aqueous dispersion medium;

and the second reactor containing the entrance for introducing a suspension of partially polymerized monomer droplets in the aqueous dispersion medium, a tool for intensive mixing of the suspension and an outlet for removal of the target product,

wherein the first reactor is made in the form of at least one tubular qi is indicacao housing with tapered upper and lower parts with respect to the case length to diameter of at least 20:1, respectively.

8. Installation according to claim 7, characterized in that the ratio of length to diameter of the first reactor is preferably (100-500):1 respectively.

9. Installation according to claim 7, characterized in that the tubular cylindrical body of the first reactor is made divided by internal partitions into sections.

10. Installation according to claim 7, characterized in that the tapered upper and lower portions have a taper angle of not more than 30°.

11. Installation according to claim 9, characterized in that the first reactor is made in the form of a cascade of series-connected buildings with a uniform vertical displacement of successive buildings down relative to each other.

12. Installation according to claim 7, characterized in that caplease the device is equipped with means for regulating the temperature of the aqueous dispersion medium and Monomeric liquid introduced into the line supply.

13. Installation according to claim 7, characterized in that caplease the device part of the chamber wall above Villeroy made transparent and it is equipped with optical-digital system for visual monitoring of the process of dripping, which includes a video camera, set against a transparent part of a wall, connected to the video display, strobe illuminator, set against a transparent part of a wall, connected through a frequency divider with a frequency generator and vibrator is m



 

Same patents:

FIELD: chemistry of polymers, chemical technology.

SUBSTANCE: invention relates to copolymers consisting of monomers comprising acid groups with double bond and other hydrophobic monomeric component used in prophylaxis of inorganic and organic deposits in water-bearing systems. Invention describes a water-soluble copolymer comprising: (a) monoethylene-unsaturated monomers chosen from group consisting of monocarboxylic acids, dicarboxylic acids and sulfoacids that can be neutralized; (b) at least copolymerizable hydrophobic acrylic, monocyclic and/or bicyclic terpene comprising unsaturated double bond wherein terpene hydrocarbon is preferable, and copolymer is prepared by free-radical copolymerization of components (a) and (b) in an aqueous phase. Also, invention describes a method for synthesis of abovementioned copolymer and methods for its using. Invention provides synthesis of nontoxic copolymer used for prevention of deposits in water-bearing systems that can be easily prepared from available components and able to store for a long time without loss of activity.

EFFECT: improved preparing method, valuable properties of copolymers.

22 cl, 6 tbl, 6 ex

FIELD: polymer production.

SUBSTANCE: invention provides elastomeric polymer composition comprising at least polymers and copolymers obtained from substituted and unsubstituted vinylaromatic monomers and from diene monomers and including 15 to 85% copolymer containing (i) at least one block formed by 10 to 5000 mainly syndiotactic structural sequences of monomer units derived from at least one substituted or unsubstituted vinylaromatic monomer and (ii) at least one block formed by 10 to 4000 monomer units derived from at least one diene monomer with predominant 1,4-cis structure, wherein 15-85 wt % of polymer obtained from diene monomers has molecular weight between 6000 and 600000 with content of 1,4-cis monomer units constituting at least 90%, while up to 70% of polymer obtained from substituted and unsubstituted vinylaromatic monomers has molecular weight between 10000 and 500000 and degree of syndiotacticity (expressed through syndiotactic pentads) at least 95%, a part formed by monomer units derived from diene monomer is optionally partially or completely hydrogenised. Method of preparing such elastomeric composition is also described.

EFFECT: extended temperature range for elastomeric performance of composition.

42 cl, 5 tbl, 27 ex

FIELD: polymerization processes.

SUBSTANCE: polymer containing at least one boronate substituent or its precursor is prepared by controlled living radical polymerization of monomers in presence of living chain growth control agent, in particular sulfur-containing compound having S-C(S)- bond, said monomers being represented by (i) at least one monomer having at least one boronate substituent or its precursor and selected from group consisting of acryloylbenzeneboronic acid, methacryloylbenzeneboronic acid, vinyl-4-benzeneboronic acid, 3-acrylamidophenylboronic acid, 3-methacrylamidophenylboronic acid, individually or in mixture, or in salt form, and (ii) at least having no boronate substituents nor their precursors. Also described is associate containing above-defined polymer with at least one compound ligand having at least one group capable of forming complex with the polymer containing at least one boronate substituent or its precursor.

EFFECT: narrowed molecular mass distribution and uniformity along the polymer chain.

FIELD: polymer production.

SUBSTANCE: invention is directed to production of water-soluble polymers or water-swellable hydrogels, detergents, and various composites based thereon, as well as to preparation of novel therapeutical forms. Acrylate-type polymer are obtained via light-induced polymerization of acrylate monomers in presence of metal-free porphyrins and accurately dosed quantities of molecular oxygen under irradiation by visible light within wavelength range 400-700 nm. Distinguishing feature of such a polymerization resides in high oxygen-sensitivity and concentration of porphyrin, by variation of which one can vary polymer characteristics within a wide range and. in case of acrylic acids, additionally structurize polyelectrolytes based thereon resulting in hydrogels showing different degrees of swelling in water.

EFFECT: simplified process, reduced consumption of photoinitiator, enabled polymerization of acrylic monomers in absence of their alkyl-substituted derivatives, and enabled carrying out process in bulk, in solution, or in emulsion.

6 cl, 1 tbl, 7 ex

FIELD: polymer production.

SUBSTANCE: invention is directed to production of water-soluble polymers or water-swellable hydrogels, detergents, and various composites based thereon, as well as to preparation of novel therapeutical forms. Acrylate-type polymer are obtained via light-induced polymerization of acrylate monomers in presence of metal-free porphyrins and accurately dosed quantities of molecular oxygen under irradiation by visible light within wavelength range 400-700 nm. Distinguishing feature of such a polymerization resides in high oxygen-sensitivity and concentration of porphyrin, by variation of which one can vary polymer characteristics within a wide range and. in case of acrylic acids, additionally structurize polyelectrolytes based thereon resulting in hydrogels showing different degrees of swelling in water.

EFFECT: simplified process, reduced consumption of photoinitiator, enabled polymerization of acrylic monomers in absence of their alkyl-substituted derivatives, and enabled carrying out process in bulk, in solution, or in emulsion.

6 cl, 1 tbl, 7 ex

FIELD: resins, chemical technology.

SUBSTANCE: invention relates to frothing polystyrene resin showing the best mechanical strength. Invention describes frothing polystyrene resin of high strength and comprising the following components, mas. p. p.: (a) styrene monomer, 100; (b) calcium carbonate nanoparticles, 0.5-5, and (c) dye, 0.5-10. Also, invention describes a method for preparing colored frothing polystyrene resin and frothing molded product prepared from styrene resin particles and exhibiting high strength. Invention provides preparing colored frothing resin of high strength, good degree of coloring, resistance to chemical effects and mechanical strength.

EFFECT: improved and valuable properties of resin.

4 cl, 1 tbl, 11 ex

FIELD: chemical industry; other industries; methods of the continuous gaseous-phase polymerization.

SUBSTANCE: the invention is pertaining to the method of the continuous gaseous-phase polymerization for production of the ethylene and propylene homopolymers and copolymers. The invention presents the method of the gaseous-phase polymerization for production of the ethylene and propylene homopolymers and copolymers, in which ethylene, propylene or the mixtures containing ethylene and propylene and α-monoolefins with 3-8 atoms of carbon are polymerized in the zone of polymerization of the reactor of the gaseous-phase polymerization at the temperature from 30°С up to 125°С and the pressure from 1 bar up to 100 bar in the gaseous phase in the layer, which includes the finely dispersed polymer. In the presence of the catalyst the reactor gas is exposed to circulation for withdrawal of the polymerization reaction heat, and the circulated reactor gas after its withdrawal from the reactor is exposed to action of the catalytic poison having the boiling temperature exceeding the maximum temperature in the gas circulating system, which is notable for the fact, that the circulated reactor gas after treatment with the catalytic poison is gated through the cyclone and in the capacity of the catalytic poison they use the catalytic poison having the vapor tension at the temperature of 20°С less, than 10000 Pa. The technical result of the invention is prevention of formation of the polymeric settlings in the system of the gas circulation of the installations of the gaseous-phase polymerization, the increased service life of the installations, the improved quality of the polymerization product.

EFFECT: the invention ensures prevention of formation of the polymeric settlings in the system of the gas circulation of the installations of the gaseous-phase polymerization, the increased service life of the installations, the improved quality of the polymerization product.

6 cl, 2 tbl, 10 ex

FIELD: chemical industry; other industries; methods of the continuous gaseous-phase polymerization.

SUBSTANCE: the invention is pertaining to the method of the continuous gaseous-phase polymerization for production of the ethylene and propylene homopolymers and copolymers. The invention presents the method of the gaseous-phase polymerization for production of the ethylene and propylene homopolymers and copolymers, in which ethylene, propylene or the mixtures containing ethylene and propylene and α-monoolefins with 3-8 atoms of carbon are polymerized in the zone of polymerization of the reactor of the gaseous-phase polymerization at the temperature from 30°С up to 125°С and the pressure from 1 bar up to 100 bar in the gaseous phase in the layer, which includes the finely dispersed polymer. In the presence of the catalyst the reactor gas is exposed to circulation for withdrawal of the polymerization reaction heat, and the circulated reactor gas after its withdrawal from the reactor is exposed to action of the catalytic poison having the boiling temperature exceeding the maximum temperature in the gas circulating system, which is notable for the fact, that the circulated reactor gas after treatment with the catalytic poison is gated through the cyclone and in the capacity of the catalytic poison they use the catalytic poison having the vapor tension at the temperature of 20°С less, than 10000 Pa. The technical result of the invention is prevention of formation of the polymeric settlings in the system of the gas circulation of the installations of the gaseous-phase polymerization, the increased service life of the installations, the improved quality of the polymerization product.

EFFECT: the invention ensures prevention of formation of the polymeric settlings in the system of the gas circulation of the installations of the gaseous-phase polymerization, the increased service life of the installations, the improved quality of the polymerization product.

6 cl, 2 tbl, 10 ex

FIELD: polymerization catalyst and polymer production.

SUBSTANCE: invention relates to preparation of high-activity catalyst deposited on solid support and designed for suspension polymerization of ethylene and copolymerization of ethylene with α-olefins, in particular, for production of ultrahigh-molecular weight polyethylene. Catalyst according to invention comprises organoaluminum compound (40-200 wt parts) and solid component (1 wt part) containing 12-15% catalytically active titanium compounds and 85-88% magnesium dichloride support prepared by interaction of magnesium metal, ethanol, aluminum, silicon, and titanium compounds, said solid component being represented by particles containing titanium, magnesium, chlorine, aluminum, and silicon at atomic ratio between 1.0:6:16:0.07:0,02 and 1:7:18:0.06:0.01, respectively. Described are also preparation of solid catalyst component, and (co)polymerization of ethylene at temperature between 0 and 100°C and pressure between 0.1 and 5.0 MPa. Catalyst according to invention allows obtaining polyethylene with elevated molecular weight under high polymer yield conditions, which minimizes time required for preparation of homogenous spinning solutions in the gel formation process and minimizes degree of degradation of dissolved polymer properties.

EFFECT: increased molecular weight and yield of polyethylene .

8 cl, 1 dwg, 3 tbl, 26 ex

FIELD: polymer materials.

SUBSTANCE: invention relates to inverter mixture and application thereof, to "water in oil" polymer dispersion, and to a methods for preparation and use of the latter. Inverter mixture contains at least one oxyethylated fatty alcohol and at least one oxyethylated mono- and/or dialkanolamide of fatty acid or at least one oxyethylated fatty alcohol and at least one alkylpolyglycoside. Inverter mixtures finds use as additives for "water in oil" polymer dispersions to convert them into "oil in water" polymer dispersions when being diluted with large amount of water. "Water in oil" polymer dispersion, consisting of continuous essentially water-immiscible organic phase and, finely distributed therein, water-soluble and/or water-swellable polymers and, optionally, auxiliary substances, contains inverter mixture. Such a dispersion is prepared via emulsion polymerization inducing inversion of phases by adding to polymers inverter mixture when polymerization process is ended. Inverted dispersion is used as flocculant in sedimentation of solids, especially in water, industrial water, and waste water treatment processes, in mining operations, especially in production of coal, aluminum, and oil, or as supplements in paper manufacture industry and sugar industry.

EFFECT: reduced environmental toxicity of inverter mixtures and increased their dispersibility and solubility in "water in oil" polymer dispersions.

12 cl, 13 tbl, 18 ex

FIELD: chemistry of polymers, chemical technology.

SUBSTANCE: invention relates to copolymers consisting of monomers comprising acid groups with double bond and other hydrophobic monomeric component used in prophylaxis of inorganic and organic deposits in water-bearing systems. Invention describes a water-soluble copolymer comprising: (a) monoethylene-unsaturated monomers chosen from group consisting of monocarboxylic acids, dicarboxylic acids and sulfoacids that can be neutralized; (b) at least copolymerizable hydrophobic acrylic, monocyclic and/or bicyclic terpene comprising unsaturated double bond wherein terpene hydrocarbon is preferable, and copolymer is prepared by free-radical copolymerization of components (a) and (b) in an aqueous phase. Also, invention describes a method for synthesis of abovementioned copolymer and methods for its using. Invention provides synthesis of nontoxic copolymer used for prevention of deposits in water-bearing systems that can be easily prepared from available components and able to store for a long time without loss of activity.

EFFECT: improved preparing method, valuable properties of copolymers.

22 cl, 6 tbl, 6 ex

FIELD: polymer production.

SUBSTANCE: invention provides elastomeric polymer composition comprising at least polymers and copolymers obtained from substituted and unsubstituted vinylaromatic monomers and from diene monomers and including 15 to 85% copolymer containing (i) at least one block formed by 10 to 5000 mainly syndiotactic structural sequences of monomer units derived from at least one substituted or unsubstituted vinylaromatic monomer and (ii) at least one block formed by 10 to 4000 monomer units derived from at least one diene monomer with predominant 1,4-cis structure, wherein 15-85 wt % of polymer obtained from diene monomers has molecular weight between 6000 and 600000 with content of 1,4-cis monomer units constituting at least 90%, while up to 70% of polymer obtained from substituted and unsubstituted vinylaromatic monomers has molecular weight between 10000 and 500000 and degree of syndiotacticity (expressed through syndiotactic pentads) at least 95%, a part formed by monomer units derived from diene monomer is optionally partially or completely hydrogenised. Method of preparing such elastomeric composition is also described.

EFFECT: extended temperature range for elastomeric performance of composition.

42 cl, 5 tbl, 27 ex

FIELD: polymerization processes.

SUBSTANCE: polymer containing at least one boronate substituent or its precursor is prepared by controlled living radical polymerization of monomers in presence of living chain growth control agent, in particular sulfur-containing compound having S-C(S)- bond, said monomers being represented by (i) at least one monomer having at least one boronate substituent or its precursor and selected from group consisting of acryloylbenzeneboronic acid, methacryloylbenzeneboronic acid, vinyl-4-benzeneboronic acid, 3-acrylamidophenylboronic acid, 3-methacrylamidophenylboronic acid, individually or in mixture, or in salt form, and (ii) at least having no boronate substituents nor their precursors. Also described is associate containing above-defined polymer with at least one compound ligand having at least one group capable of forming complex with the polymer containing at least one boronate substituent or its precursor.

EFFECT: narrowed molecular mass distribution and uniformity along the polymer chain.

FIELD: polymer production.

SUBSTANCE: invention is directed to production of water-soluble polymers or water-swellable hydrogels, detergents, and various composites based thereon, as well as to preparation of novel therapeutical forms. Acrylate-type polymer are obtained via light-induced polymerization of acrylate monomers in presence of metal-free porphyrins and accurately dosed quantities of molecular oxygen under irradiation by visible light within wavelength range 400-700 nm. Distinguishing feature of such a polymerization resides in high oxygen-sensitivity and concentration of porphyrin, by variation of which one can vary polymer characteristics within a wide range and. in case of acrylic acids, additionally structurize polyelectrolytes based thereon resulting in hydrogels showing different degrees of swelling in water.

EFFECT: simplified process, reduced consumption of photoinitiator, enabled polymerization of acrylic monomers in absence of their alkyl-substituted derivatives, and enabled carrying out process in bulk, in solution, or in emulsion.

6 cl, 1 tbl, 7 ex

FIELD: polymer production.

SUBSTANCE: invention is directed to production of water-soluble polymers or water-swellable hydrogels, detergents, and various composites based thereon, as well as to preparation of novel therapeutical forms. Acrylate-type polymer are obtained via light-induced polymerization of acrylate monomers in presence of metal-free porphyrins and accurately dosed quantities of molecular oxygen under irradiation by visible light within wavelength range 400-700 nm. Distinguishing feature of such a polymerization resides in high oxygen-sensitivity and concentration of porphyrin, by variation of which one can vary polymer characteristics within a wide range and. in case of acrylic acids, additionally structurize polyelectrolytes based thereon resulting in hydrogels showing different degrees of swelling in water.

EFFECT: simplified process, reduced consumption of photoinitiator, enabled polymerization of acrylic monomers in absence of their alkyl-substituted derivatives, and enabled carrying out process in bulk, in solution, or in emulsion.

6 cl, 1 tbl, 7 ex

FIELD: resins, chemical technology.

SUBSTANCE: invention relates to frothing polystyrene resin showing the best mechanical strength. Invention describes frothing polystyrene resin of high strength and comprising the following components, mas. p. p.: (a) styrene monomer, 100; (b) calcium carbonate nanoparticles, 0.5-5, and (c) dye, 0.5-10. Also, invention describes a method for preparing colored frothing polystyrene resin and frothing molded product prepared from styrene resin particles and exhibiting high strength. Invention provides preparing colored frothing resin of high strength, good degree of coloring, resistance to chemical effects and mechanical strength.

EFFECT: improved and valuable properties of resin.

4 cl, 1 tbl, 11 ex

FIELD: chemical industry; other industries; methods of the continuous gaseous-phase polymerization.

SUBSTANCE: the invention is pertaining to the method of the continuous gaseous-phase polymerization for production of the ethylene and propylene homopolymers and copolymers. The invention presents the method of the gaseous-phase polymerization for production of the ethylene and propylene homopolymers and copolymers, in which ethylene, propylene or the mixtures containing ethylene and propylene and α-monoolefins with 3-8 atoms of carbon are polymerized in the zone of polymerization of the reactor of the gaseous-phase polymerization at the temperature from 30°С up to 125°С and the pressure from 1 bar up to 100 bar in the gaseous phase in the layer, which includes the finely dispersed polymer. In the presence of the catalyst the reactor gas is exposed to circulation for withdrawal of the polymerization reaction heat, and the circulated reactor gas after its withdrawal from the reactor is exposed to action of the catalytic poison having the boiling temperature exceeding the maximum temperature in the gas circulating system, which is notable for the fact, that the circulated reactor gas after treatment with the catalytic poison is gated through the cyclone and in the capacity of the catalytic poison they use the catalytic poison having the vapor tension at the temperature of 20°С less, than 10000 Pa. The technical result of the invention is prevention of formation of the polymeric settlings in the system of the gas circulation of the installations of the gaseous-phase polymerization, the increased service life of the installations, the improved quality of the polymerization product.

EFFECT: the invention ensures prevention of formation of the polymeric settlings in the system of the gas circulation of the installations of the gaseous-phase polymerization, the increased service life of the installations, the improved quality of the polymerization product.

6 cl, 2 tbl, 10 ex

FIELD: chemical industry; other industries; methods of the continuous gaseous-phase polymerization.

SUBSTANCE: the invention is pertaining to the method of the continuous gaseous-phase polymerization for production of the ethylene and propylene homopolymers and copolymers. The invention presents the method of the gaseous-phase polymerization for production of the ethylene and propylene homopolymers and copolymers, in which ethylene, propylene or the mixtures containing ethylene and propylene and α-monoolefins with 3-8 atoms of carbon are polymerized in the zone of polymerization of the reactor of the gaseous-phase polymerization at the temperature from 30°С up to 125°С and the pressure from 1 bar up to 100 bar in the gaseous phase in the layer, which includes the finely dispersed polymer. In the presence of the catalyst the reactor gas is exposed to circulation for withdrawal of the polymerization reaction heat, and the circulated reactor gas after its withdrawal from the reactor is exposed to action of the catalytic poison having the boiling temperature exceeding the maximum temperature in the gas circulating system, which is notable for the fact, that the circulated reactor gas after treatment with the catalytic poison is gated through the cyclone and in the capacity of the catalytic poison they use the catalytic poison having the vapor tension at the temperature of 20°С less, than 10000 Pa. The technical result of the invention is prevention of formation of the polymeric settlings in the system of the gas circulation of the installations of the gaseous-phase polymerization, the increased service life of the installations, the improved quality of the polymerization product.

EFFECT: the invention ensures prevention of formation of the polymeric settlings in the system of the gas circulation of the installations of the gaseous-phase polymerization, the increased service life of the installations, the improved quality of the polymerization product.

6 cl, 2 tbl, 10 ex

FIELD: polymerization catalyst and polymer production.

SUBSTANCE: invention relates to preparation of high-activity catalyst deposited on solid support and designed for suspension polymerization of ethylene and copolymerization of ethylene with α-olefins, in particular, for production of ultrahigh-molecular weight polyethylene. Catalyst according to invention comprises organoaluminum compound (40-200 wt parts) and solid component (1 wt part) containing 12-15% catalytically active titanium compounds and 85-88% magnesium dichloride support prepared by interaction of magnesium metal, ethanol, aluminum, silicon, and titanium compounds, said solid component being represented by particles containing titanium, magnesium, chlorine, aluminum, and silicon at atomic ratio between 1.0:6:16:0.07:0,02 and 1:7:18:0.06:0.01, respectively. Described are also preparation of solid catalyst component, and (co)polymerization of ethylene at temperature between 0 and 100°C and pressure between 0.1 and 5.0 MPa. Catalyst according to invention allows obtaining polyethylene with elevated molecular weight under high polymer yield conditions, which minimizes time required for preparation of homogenous spinning solutions in the gel formation process and minimizes degree of degradation of dissolved polymer properties.

EFFECT: increased molecular weight and yield of polyethylene .

8 cl, 1 dwg, 3 tbl, 26 ex

FIELD: polymer materials.

SUBSTANCE: invention relates to inverter mixture and application thereof, to "water in oil" polymer dispersion, and to a methods for preparation and use of the latter. Inverter mixture contains at least one oxyethylated fatty alcohol and at least one oxyethylated mono- and/or dialkanolamide of fatty acid or at least one oxyethylated fatty alcohol and at least one alkylpolyglycoside. Inverter mixtures finds use as additives for "water in oil" polymer dispersions to convert them into "oil in water" polymer dispersions when being diluted with large amount of water. "Water in oil" polymer dispersion, consisting of continuous essentially water-immiscible organic phase and, finely distributed therein, water-soluble and/or water-swellable polymers and, optionally, auxiliary substances, contains inverter mixture. Such a dispersion is prepared via emulsion polymerization inducing inversion of phases by adding to polymers inverter mixture when polymerization process is ended. Inverted dispersion is used as flocculant in sedimentation of solids, especially in water, industrial water, and waste water treatment processes, in mining operations, especially in production of coal, aluminum, and oil, or as supplements in paper manufacture industry and sugar industry.

EFFECT: reduced environmental toxicity of inverter mixtures and increased their dispersibility and solubility in "water in oil" polymer dispersions.

12 cl, 13 tbl, 18 ex

FIELD: chemistry of polymers, chemical technology.

SUBSTANCE: invention relates to copolymers consisting of monomers comprising acid groups with double bond and other hydrophobic monomeric component used in prophylaxis of inorganic and organic deposits in water-bearing systems. Invention describes a water-soluble copolymer comprising: (a) monoethylene-unsaturated monomers chosen from group consisting of monocarboxylic acids, dicarboxylic acids and sulfoacids that can be neutralized; (b) at least copolymerizable hydrophobic acrylic, monocyclic and/or bicyclic terpene comprising unsaturated double bond wherein terpene hydrocarbon is preferable, and copolymer is prepared by free-radical copolymerization of components (a) and (b) in an aqueous phase. Also, invention describes a method for synthesis of abovementioned copolymer and methods for its using. Invention provides synthesis of nontoxic copolymer used for prevention of deposits in water-bearing systems that can be easily prepared from available components and able to store for a long time without loss of activity.

EFFECT: improved preparing method, valuable properties of copolymers.

22 cl, 6 tbl, 6 ex

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