Method of synthesis of carbamide and the column for its realization

FIELD: chemical industry; methods of synthesis of carbamide and the column for its realization.

SUBSTANCE: the invention is pertaining to the method of synthesis of carbamide from ammonia and carbon dioxide in the column of synthesis with the gas-liquid recycle, at which the stream of the water solution of the carbon-ammonium salts (CAS) from the area of distilling route from above or from below into the middle of the synthesis column containing the vertical cylindrical body, the corrosion-resistant material lining located on the body interior surface, the mixer and the unions of inlet and outlet of the reactants and having the located inside it perforated pipeline, which holes are disposed in pairs along the pipeline perimeter at the level of the column muddle midpoints of a column at the angle of 20° - 60° to the central axis of the column. The technical result of the invention consists in intensification of the contacting of the introduced components, the increased service life of the column lining layer and the raised conversion due to removal of the surplus of the water formed during the synthesis process.

EFFECT: the invention ensures intensification of the contacting of the introduced components, the increased service life of the column lining layer, the raised of conversion.

3 cl, 3 dwg

 

The invention relates to the synthesis of urea from ammonia and carbon dioxide at elevated temperature and pressure and the apparatus registration process in a gas-liquid environment.

All industrial methods of producing urea based on its formation by the reaction of ammonia with carbon dioxide:

2NH3+CO2=CO(NH2)2+H2O

In terms of synthesis at high pressure (200 ATM) and temperatures (150-200° (C) formed during the reaction water is mostly in the liquid phase and has a significant influence on the displacement reaction in the direction of the original substances, especially at the beginning of the synthesis process, thereby reducing its effectiveness.

Known methods used to shift the reaction towards the formation of urea dehydrating substances, such as anhydrous magnesium sulfate, calcium chloride, silica (B.Neumann, A.Sonntag, Z.Elektrochem., 37,805 (1931) or the hydrate of aluminum oxide and iron oxide (Bieleve, GHP, 11, №9, 38 (1934).

However, in terms of the synthesis of urea products of the interaction of these agents with water is unstable and does not shift the reaction towards the formation of urea.

Known methods for the synthesis of urea recycling the ammonium salts (UAS) in the form of aqueous solution or suspension (Horlivka D.M. and other Technology urea. - L.: Chemistry, 1981, U.S. Patent No. 3091637, CL-555, 1963; patent RU 1774623, the L. SS 273/04, 1996; patent RU 2071467, CL SS 273/04, 1997).

The disadvantage of these methods is a significant amount of water formed during the synthesis in the area of the main reaction, which, together with the aqueous solution playmoney salts (UAS) is returned to the synthesis column that does not allow to increase the degree of conversion of the starting components.

In the industrial units of the synthesis of urea with a capacity of 90 thousand/year with liquid recycle return ammonium salt (UAS) containing 20-25 wt.%. Water and after washing of the column into the mixer for mixing with ammonia and carbon dioxide and then in the lower part of the synthesis column, in the initial stage of the synthesis process of urea, increasing the amount of water and reducing the degree of conversion.

The closest in technical essence and the achieved result is a method of producing urea at elevated temperature and pressure at which the reaction zone deduce the melt synthesis, which is divided into liquid products and gaseous mixture of unreacted components by heating under pressure synthesis in the Stripping zone. The separated gas stream is directed in an additional reaction zone, which also serves fresh carbon dioxide and ammonia, and which operates in the adiabatic regime at a temperature equal to the temperature in the synthesis zone. Then the floor is Chennai gaseous products add a dilute aqueous solution of ammonium salts from the stage of concentration of the urea solution and the mixture is sent to the stage condensing gas and absorption of ammonium carbamate, saturated absorbent sephirot and returned to the synthesis zone (SU 1774623, CL SS 273/04, publ. 1996.05.20).

The disadvantages of this method include the difficulty of separation of UAS and multi-stage multi-introducing them in a cycle of reaction.

The technical result of the present invention is to reduce the negative impact of excess water that is returned when the liquid recycle in the form of an aqueous solution of UAS in the initial stage of the reaction, and increasing the conversion rate to 70-75%.

This technical result is achieved by the fact that the flow of aqueous solution of UAS from the main reaction zone is sent to the middle columns of the synthesis of small streams at an angle of 20-60° to the Central axis of the column.

After an aqueous solution of UAS through holes located in pairs at different heights of the pipeline at an angle of 20-60° to the Central axis of the column occurs under different pressure and different speed. At higher levels of the streams UAS come with lesser rate than from the bottom. This allows you to evenly distribute in the inner space of the column an aqueous solution of UAS and to provide intensive uniform contacting of the input components in the reaction zone with increasing degree of conversion of the starting components is above 70%.

The invention is illustrated in the drawings. Figure 1 shows a column of synthesis of urea (p is pout) where 1 is a vertical cylindrical column frame, 2 - pipeline output Plava urea, 3 - fitting of input reagents, 4 - perforated pipe to enter the UAS, 5 - a cover of the synthesis column, 6 holes of the pipeline 4. Figure 2 shows a column of synthesis of urea (the second option) with a vertical cylindrical housing 1, a pipeline for water urea 2, fitting of input reagents 3, a perforated turborotor to enter the UAS 4, cover the synthesis column 5, the openings 2 in the upper part of the perforated pipe 4. Figure 3 shows a section along a-a perforated pipe 4, intended for submission to the synthesis of urea returnable aqueous solutions UAS small streams at an angle to the Central axis of the column through holes 6.

In the process of return of UAS at the output of the synthesis column from the zone of the main reaction send a small trickle from the top (figure 1) or bottom (figure 2) in the middle of the column through holes 6 (Fig 3), located on the perimeter of the pipe 4 at an angle of 20-60° to the Central axis of the column.

Famous column of the synthesis of urea, comprising a vertical cylindrical casing, the inner surface of which is lined with corrosion resistant material. The housing has fittings of the input and output of reagents, mixing unit and C is its inside horizontal partitions with varying the free cross-section along the column height (SU 808122, CL B01J 19/00, 1976).

The disadvantage of this column is insufficient degree of conversion of carbon dioxide.

Known design lined columns synthesis, used in the production of liquid recycle. Column is made in the form of a cylindrical vessel placed inside the mixer (Curly V.I., Lebedev V.V. Synthesis and application of urea. M.: Chemistry, 1970, s-317).

The disadvantage of this design should include the difficulty and duration of the repair of the lining, as well as the need to respect a certain temperature when heating and cooling of the column.

Known reactor for carrying out the process in a gas-liquid environment, comprising a vertical casing and a vertical contact device, consisting of outer and inner elements, concentrically arranged one within another, each has a hole (slit) to enter the environment in the upper part (SU 215883, CL B01J 37/02, 1968).

However, the density of the medium in such a reactor for the synthesis of urea in its Central part is smaller than the wall, so in the Central part holds more reactionary environment, including water contained in return UAS, shifting the reaction towards the original substances.

Closest to the proposed technical solution is the synthesis column urea containing vertical cylindrical the second case, placed on the inner surface of the lining from the corrosive material, mass transfer device made in the form connected in series nozzle, a receiving and mixing chambers, the diffuser is installed on the hose reagents and enclosed in a perforated casing (EN 2173212, CL 01J 10/00, 2001).

The disadvantage of this design of the column is relatively rapid destruction of the lining of corrosion-resistant material and insufficient degree of conversion of carbon dioxide within 65%.

The technical result of the invention is to increase the degree of conversion of the initial reagents above 70-71%, reduction of surface active contact of the inner lining of the synthesis column with aggressive initial reagents and aqueous solutions of UAS.

To achieve the technical result column of the synthesis of urea in a liquid environment comprising a vertical housing with a socket for input and output of the reagents, is located inside the perforated pipe, the holes which are arranged in pairs around the perimeter of the pipe in the upper part of the middle column at an angle of 20-60° to its Central axis.

The placement of holes in pairs around the perimeter of the pipeline at different height at an angle of 20-60° provides finding water dissolve the and UAS in these holes under different pressure due to the different depth of these holes in space of the column. Therefore, the driving force expiration of UAS through these holes will be variable according to the height of the pipeline due to a change in pressure.

In different sections of the pipeline, the flow rate of the streams UAS will be different: more of the upper level jet UAS come with lesser rate than from the bottom.

This allows you to evenly distribute in the space of column flow UAS and to intensify the process of contacting the original components.

The location of the holes at an angle of 20-60° allows you to receive alternately the falling pressure in the pipeline, to reduce the time rate of motion of an aqueous solution of UAS and thereby increase the time of contact of the components of the reaction.

Figure 1 shows the synthesis column with a perforated pipe 4 located in the center of the column in its upper part. Figure 2 shows a column of synthesis of urea from the pipeline 4, located in the center of the column at the bottom. Figure 3 shows a slice of the pipeline 4 to its diameter, the periphery of which are located in pairs at an angle of 20-60° to the Central axis of the hole 6.

The pipeline is attached to the inlet or outlet reagents 3, 2 (2), or installed in the cover 5 of the vertical cylindrical body 1 synthesis column (figure 1).

In the synthesis process of urea formed in the initial stage of synthesis in the hydrated solution of UAS, guide through placed inside the column at the center of the perforated pipe 4, in the upper part of which there are openings 6 located at an angle of 20-60° to its Central axis.

Using the proposed method for the synthesis of urea and columns for its implementation allows to increase the degree of conversion of the synthesis of urea up to 70-71% instead of 64-65% currently, to increase the capacity of the unit for 8-10 tonnes/year while reducing cost by reducing fixed costs and energy consumption at all stages of rectification of solutions of urea.

1. The method of synthesis of urea from ammonia and carbon dioxide in the synthesis column with a gas-liquid recycling, in which the flow of an aqueous solution playmoney salts (UAS), formed in the initial stage of the process, directed to the middle columns of the synthesis of small streams at an angle of 20-60° to the Central axis of the column.

2. Column synthesis of urea from the gas-liquid recycling, comprising a vertical cylindrical casing, is placed on the inner surface of the lining of corrosion-resistant material, the socket for input and output of the reagents, when this column is located inside the perforated pipe, the holes which are placed in pairs around the perimeter of the pipeline and are at the level of ser is Dina columns at an angle of 20-60° to the Central axis of the column.

3. Synthesis column according to claim 2, in which the perforated pipe for supplying an aqueous solution of UAS attached to the inlet or outlet reagents or installed in the lid of the synthesis column.



 

Same patents:

FIELD: chemical industry; methods and the devices for production of carbamide from ammonia and carbon dioxide.

SUBSTANCE: the invention is pertaining to the field of chemical industry, in particular, to the methods and the devices for production of carbamide from ammonia and carbon dioxide. The method of production of carbamide includes the interaction of ammonia and carbon dioxide in the zone of synthesis at the heightened temperatures and pressures with formation of the melt of the carbamide containing carbamide, water, ammonium carbamate, ammonia and carbon dioxide. The carbamide melt distillation conduct at the heat feeding on the two stages of pressure preferentially at 15-25°C and 2-5 kgf/cm2. The carbamide melt distillation on the first step of the pressure conduct sequentially in two zones. In the first zone the distillation is conducted adiabatically or at the heat feeding, and in the second zone - at the heat feeding in the stream of carbon dioxide. The condensation-absorption process at refrigeration of the gases of the distillation is conducted with utilization of the aqueous absorbers. The formed aqueous solutions of the carbon- ammonium salts are recycled from the stage of the condensation-absorption of the gases of the distillation of the second step to the stage of the condensation-absorption of the gases of distillation of the first step, and also from the stage of the condensation-absorption of the gases of distillation of the first step into the zone of the synthesis. The evaporation of the aqueous solution of carbamide is exercised in some steps at the heat exchange between the gases of the distillation of the first step and the aqueous solution of carbamide at the stage of the preliminary evaporation. The installation for production of carbamide consists of: the reactor of the carbamide synthesis; the device with the heat feeding from the external source for distillation of the carbamide melt produced in the reactor of the carbamide synthesis at the first step of the pressure and consisting of the column of distillation melt of the first step and the film-type heat exchanger; the device with the heat feeding for the distillation of the carbamide melt on the second step of pressure; apparatuses for evaporation at heating of the aqueous solution of the carbamide produced on the second step of distillation. The devices for condensation-absorption at refrigeration of the gases of the distillation of the both steps switch on the heat exchanger-recuperator for heat interchange between the gases of the distillation of the first step and the aqueous solution of carbamide. The installation also contains a means for feeding of ammonia and carbon dioxide into the reactor of synthesis of carbamide, feeding of the carbamide melt from the reactor of synthesis into the column of distillation of the first step, from the column of distillation of the first step into the film-type heat exchanger and from the film-type heat exchanger into the device for distillation of the second step, the aqueous solution of carbamide from the device for distilling of the second step into the heat exchanger-recuperator and from the heat exchanger-recuperator - into the apparatus for the subsequent evaporation; the gases of distillation from the device for distilling of the first step - in the heat exchanger-recuperator and from the heat exchanger-recuperator - into the device for condensation-absorption of the gases of distillation of the first step; the gases of distillation from the apparatus for distillation of the second step - into the device for condensation-absorption of the gases of distillation of the second step; the solution of the carbon-ammonium salts from the device for condensation-absorption of the gases of distillation of the second step - into the device for condensation-absorption of the gases of distillation of the first step and from the device for condensation-absorption of the gases of distillation of the first step - into the reactor of synthesis, a means for feeding of carbon dioxide into the film-type heat exchanger. The technical result of the invention is the increased degree of the heat recuperation of the production cycle and reduction of he quantity of the heat exchangers using the heating steam from the external sources.

EFFECT: the invention ensures the increased degree of the heat recuperation of the production cycle and reduction of he quantity of the heat exchangers using the heating steam from the external sources.

8 cl, 3 ex, 3 dwg

FIELD: chemical industry; devices and methods of production of carbamate.

SUBSTANCE: the invention is pertaining to the field of chemical industry, in particular, to carbamatecondenserof the sinking type used in the installation for production of the synthesized carbamide from the gaseous carbon dioxide and the liquid ammonia. The condenser (1) of the sinking type contains the bundle (5) of pipes, in which the condensation of the gaseous compounds is exercised and as a result of the interaction of ammonia with carbon dioxide the carbamate is formed. The condenser differs from others by availability the condensate circulating pipe (19, 23) structurally not connected with the bundle (5) of pipes and designed for circulation of the components in the closed contour of the condenser (1)of the part of the condensed inside it gaseous compounds. The availability of the separate circulating pipe structurally not connected with the bundle of the condensation pipes and communicating with the upper and the lower parts of the condenser ensures the possibility of circulation of the carbamate passing over of the bundle of the condensation pipes, what allows to increase essentially the output of carbamate gained as a result of condensation.

EFFECT: the invention allows to raise essentially the output of carbamate gained as a result of condensation.

6 cl, 3 dwg

FIELD: chemical technology.

SUBSTANCE: invention relates to technology for preparing urea. Method involves interaction of pure ammonia and carbon dioxide in reaction space to obtain reaction mixture containing urea, carbamate and free ammonia in an aqueous solution that is treated in evaporator (1) to obtain partially purified mixture that is fed to section for isolation of urea. Diluted solution of carbamate removing from the urea isolating section is subjected for treatment in evaporator (2) and at least part of vapors formed in it is recovered to the reaction space and/or into evaporator (1). Significant part of carbamate in aqueous solution is subjected for decomposition under pressure that corresponds essentially to pressure value in reaction space. Part of decomposition products including ammonia and carbon dioxide in vapor phase is recovered into reactor and/or into the first evaporator (1) and carbamate after its partial decomposing is fed into section for isolating urea. Device for preparing urea consists of the synthesis reactor, evaporators (1) and (2) for partial decomposition of carbamate and for separation of free ammonia and carbon dioxide in vapor phase, apparatus for condensation of vapor flow, pipe-line for recover of carbamate part in aqueous solution into reactor and section for isolation of urea from its aqueous solution. Preferably, pipe-line is fitted with ejector and evaporators are fitted with apparatus for feeding carbon dioxide as a evaporating agent. Invention provides enhancing yield of urea, reducing energy consumptions and investment due to updating the technological schedule of the process.

EFFECT: improved preparing and updating methods.

30 cl, 4 dwg

FIELD: chemical technology.

SUBSTANCE: invention relates to producing urea from ammonia and carbon dioxide. Method involves preparing products of reaction in the synthesis zone as a solution containing urea, ammonium carbamate and unreacted ammonia. Part of solution obtained in synthesis of urea (preferably 10-60 wt.-%) is fed from the synthesis zone to additionally assembled zone of treatment under mean pressure at 1-4 MPa wherein gas flow is separated and subjected for absorption with ammonium carbamate solution of low pressure supplying from the section for isolation and treatment of urea. As a variant of method the invention proposes to use the combined reactor in the synthesis zone representing vertically installed or combined reactor. Enhancement of output of existing processes in synthesis of urea is achieved by feeding part of urea solution synthesized in the synthesis reactor to additionally installed zone for treatment of mean pressure including the dissociation zone, desorption zone of mean pressure and the condensation zone of mean pressure. Invention provides enhancement of output of unit for producing urea being without modification of section of high pressure.

EFFECT: improved method for producing urea.

10 cl, 4 dwg

FIELD: industrial inorganic synthesis.

SUBSTANCE: aqueous carbamate solution leaving urea recovery section at a certain temperature is decomposed by indirect heat exchange with flowing heat carrier having specified temperature. Temperature difference between aqueous carbamate solution and heat carrier is thus decreased to a value not exceeding 70°C, preferably to a value within a range of 20-40°C. Aqueous carbamate solution, prior to be fed into decomposition apparatus, is preheated in heat exchanger by stream produced in evaporation zone containing ammonia and carbon dioxide in vapor phase.

EFFECT: increased efficiency of apparatuses designed for decomposition of recycled carbamate solution.

6 cl, 2 dwg

The invention relates to the technology of complex processing of hydrocarbon fuel gases, such as methane and other natural gases, to obtain a synthesized substances

The invention relates to a method for joint production of ammonia and urea on the plant includes a reactor for the synthesis of ammonia synthesis reactor urea and the regeneration section of the urea

The invention relates to a method for producing urea by the interaction of ammonia with carbon dioxide in two reaction zones operating in parallel

The invention relates to equipment carrying out processes in gas-liquid environments and can be used for the synthesis of urea from ammonia and carbon dioxide at elevated temperatures and pressures

FIELD: chemical industry; devices of the automatic control over the reactor of the semi- continuous operation.

SUBSTANCE: the invention is pertaining to the field of the control over the reactor of the semi- continuous operation (RSCO) at the variable consumption of the liquid batched component. The device contains the service tank for the liquid batched component, the reactor supplied with the stirrer, the coiled pipe and the jacket, the heat converter located in the reactor, the level sensor mounted in the service tank, the electro-pneumatic digital transducers intended for control over the pneumatic drives of the cut-off and discharge valves, the static power supply. The device is additionally supplied with the static three-channel power source, the pressure and consumption sensors arranged on the pressure branch pipe of the batcher and the electro-conductivity in the reactor, the meters of the frequency and voltage of the power delivered to the engines of the batcher and the stirrer, and also the power consumed by the consumption indicator, the microprocessor controller intended for implementation of the functions of the cascade system of the temperature stabilization of the reaction mass in the reactor and the program-pulse-revercive system making regulation of the rate of rotation of the engine of the stirrer, and also forming the control actions delivered to the electro-pneumatic transducers and through the static three-channel power supply - to the engines of the batcher, the stirrer and the consumption meter. The technical result of the invention is reduction of the batching duration, the increased production of the target product, improvement of the product quality ratings.

EFFECT: the invention ensures reduction of the batching duration, the increased production of the target product, improvement of the product quality ratings.

10 dwg, 1 tbl

FIELD: chemical industry; devices for realization of the non-adiabatic reactions.

SUBSTANCE: the invention is pertaining to the field of chemical industry, in particular, to the reactor for realization of the non-adiabatic reactions. The reactor consists of the metallic ingot and contains, at least, one reactionary passage made through the ingot and designed for maintaining the catalyst for the non-adiabatic transformation of the reactants flow. The reactor contains the inlet channels for introduction of the stream of the reactants into the reactionary passage and the outlet channels for withdrawal of the reacted stream of the reactants; and also the heating-up or cooling device intended for maintaining the catalytic non-adiabatic transformation of the torrent of the reactants. The invention provides, that the mentioned inlet and outlet channels are made in the ingot and are located mainly perpendicularly to the reactionary passages and in parallel connect the reactionary passages. The technical result of the invention is the possibility to use of the reactor for the small-scale production works.

EFFECT: the invention ensures the possibility to use of the reactor for the small-scale production works.

9 cl, 1 dwg

FIELD: environmental protection; reactors for catalytic purification of the industrial gaseous outbursts.

SUBSTANCE: the invention is pertaining to the field of environmental protection against the industrial gases release and may be used for the flameless purification of the gaseous emissions of the industrial enterprises. The reactor for catalytic purification of the industrial gaseous outbursts contains the cylindrical body, which internal surface is coated with the catalyst, the source of the infra-red source located in the body, the tubular heat exchanger, the permeable cylindrical shell ring from the catalyst, installed in the upper part of the body so, that the symmetry axes of the shell ring and the body coincide. The tubes of the heat exchanger are mounted inclined and arranged along the round perimeter of the reactor. At that the source of the infra-red emission made in the form of the cylindrical section is built in the body, where the movable bottom door is installed. The annular partition of the heat exchanger with the located on it collector of aromatization is installed before the outlet of the purified gaseous stream. The movable bottom door used for regulation of the purification degree of the gaseous outbursts is installed in the upper part of the body of the reactor. The invention allows to decrease the power input, to recover the heat and to aromatize the leaving purified gaseous stream.

EFFECT: the invention ensures the decreased power input, the recuperation of the heat, the aromatization of the leaving purified gaseous stream.

2 cl, 3 dwg

FIELD: metallurgy and chemical industry for obtaining high-purity rare-earth or refractory metals and nonmetals.

SUBSTANCE: proposed method includes fluoration of oxide or sulfide of selected agent by elemental fluorine, separation of fluoride of selected agent from mixture of gases thus obtained and decomposition of high-purity fluoride in jet of electron beam plasma at settling of pure agent on renewable substrate. Gaseous products of fluoride decomposition are removed from reaction chamber and elemental fluorine is separated from them and is directed for oxide or sulfide fluoration operation. Proposed method makes it possible to use any starting oxide- or sulfide-containing material including materials contaminated with admixtures, for example natural ore concentrates and to extract agents in form of high-purity fluorides which are used for further production of simple agents. Process requires practically no reagents due to oxide-fluorine cycle excluding thermal and chemical contamination of surrounding medium.

EFFECT: enhanced efficiency; enhanced environment safety.

10 cl, 1 dwg, 5 ex

FIELD: oil processing industry; methods and devices of the fractionation of the hydrocarbon raw.

SUBSTANCE: the invention is pertaining to the oil the oil products production process and may be used at the installations with the atmospheric and vacuum columns intended for fractionation distillation of the petroleum. At realization of the method act upon the hydrocarbon raw by the electromagnetic oscillations using the preliminary and main electromagnetic excitation. The preliminary action on the hydrocarbon raw is exercised in the working tanks or in the pipeline before the kilns of heating, and the main action is exercised in the rectification tower itself due to its resonant excitation. In the installation for realization of the method the source of the preliminary excitation is made in the form of the electromagnetic emitter with the preset frequency of oscillation, and the rectification tower after its resonance activation serves as the main exciter of the hydrocarbon raw under condition of provision of its operation in the self-oscillation mode. The formula for calculation of the oscillation frequency as the variable includes the temperature of the separation of the appropriate fraction. The technical result of the invention is the increased output of the light oils at reduction of the power inputs.

EFFECT: the invention ensures the increased output of the light oils at reduction of the power inputs.

6 cl, 1 dwg

FIELD: chemical industry.

SUBSTANCE: device comprises bottom (85), at least four sides (81), (82), (83), (84) forming inner space (87) of the tank, and at least one plate of heat exchanger (66) connected with the source of the cooler. The method for polymerizing is also presented.

EFFECT: enhanced efficiency.

20 cl, 3 dwg

FIELD: equipment of synthesis stage of process for producing urea from ammonia and carbon dioxide.

SUBSTANCE: apparatus includes high-pressure section operating practically at the same pressure values of synthesis reactor and condenser arranged inside said reactor. Condenser includes large number of flat plate like practically rectangular heat exchangers whose long sides are parallel to reactor axis. Each heat exchanger is made of two placed one onto other metallic sheets mutually joined by welding along their perimeter and forming inside heat exchanger preset-width cavity between them. Sheets from which heat exchangers are made are mutually joined by spot welding and they define in cavity of heat exchangers wavy path for fluid flowing. Said path includes mutually connected portions communicated through branch pipes for inlet of flowing heat transfer agent to heat exchangers and outlet of said agent from it. Preferable ducts for distributing flowing heat transfer agent fed to heat exchanger and for collecting outlet heat transfer agent are formed by means of tubes arranged in inner cavity of heat exchanger and secured to its mutually opposite long sides. At least one heat exchanger has internal partition passing from its one side to other opposite side and spaced from said opposite side by some distance for forming in cavity of heat exchanger U-shaped path for flowing heat transfer agent. Said path has descending and raising portions communicated with respective branch pipes passing outside from heat exchanger. Portions of U-shaped path have smoothly increased cross section area.

EFFECT: simplified design of zone for synthesis and condensation of reaction mixture for producing urea at improved efficiency of the whole process.

15 cl, 7 dwg

FIELD: physical or chemical processes or apparatus.

SUBSTANCE: device comprises interconnected blocks, first separator (1) with first side and hollow central part that forms first chamber (2) for flow of first fluid, and second separator (7) with first side that forms second chamber (6) for flow of the second fluid. The first and second chambers are separated with at least one separating plate (11). The openings made in the separators are provided for supplying fluid to the chambers and collecting fluid from chambers. Each flow separator is additionally provided with second side parallel to the first side. The first chamber is formed by the sides of the first flow separator and the second parallel separating plate or side of the first flow separator and separating plate. Each separator has four or six openings for supplying fluid to chambers and collecting fluid from chambers.

EFFECT: reduced sizes and expanded functional capabilities.

13 cl, 20 dwg

FIELD: medicine, dermatology, pharmacy.

SUBSTANCE: invention relates to agents used in treatment of skin damages. Invention proposes a composition containing the following components, g: iron nanoparticles, 0.001-1; polyethylene glycol (PEG)-400, 60-90; PEG-1500, up to 100. The composition can comprise glycerol additionally. Also, invention relates to a method for preparing the claimed composition involving ultrasonic dispersing iron nanoparticles with a base liquid part, and mixing the prepared iron nanoparticles suspension with remained part of the base. The process is carried out at temperature 40°C, not above. The claimed composition is characterized by the high wound-healing capacity and stability at storage.

EFFECT: valuable medicinal properties of composition, improved preparing method.

7 cl, 1 tbl, 4 ex

FIELD: chemical industry; devices for realization of the chemical reactions and the mass-exchange processes in the heterogeneous systems.

SUBSTANCE: the invention is pertaining to the apparatus for realization of the chemical reactions and the mass-exchange processes. The pulsation apparatus for treatment of the suspensions consists of the device for inlet of the disperse phase, which body is made in the form of the Venturi tube consisting of the cylinder-cone type convergent tube, the mounted in the body coaxially to it nozzle sealed by the tightening and ending by the branch-pipe used for the dispersion phase feeding. The body is supplied with the feeding branch-pipes, each of which is made in the form of the elbow fitting and is mounted with the capability of rotation around its axis. The apparatus contains also the tank with the branch-pipe connecting the tank with the circulation pump, to which the circulation pipeline used for the liquid continuous phase is connected. The tank is supplied with the branch-pipes and the circulation pipeline for the disperse phase. The regulating valves are intended for regulation of the ratio of the consumptions of the newly-fed liquid phase and the circulating liquid continuous phase, for regulation of the ratio of consumptions of the newly-fed and the circulating dispersion phase and for withdrawal of the spent dispersion phase. The nozzle has the capability of the axial relocation concerning the body. The invention allows to raise efficiency of the apparatus operation due to the increased degree of the dispersion of the dispersion phase and the coefficients of the mass transfer, provision of the more lengthy duration of the phases contact.

EFFECT: the invention ensures the increased efficiency of the apparatus operation, the increased degree of the dispersion of the dispersion phase and the coefficients of the mass transfer, provision of the more lengthy duration of the phases contact.

2 dwg, 2 ex

FIELD: equipment of synthesis stage of process for producing urea from ammonia and carbon dioxide.

SUBSTANCE: apparatus includes high-pressure section operating practically at the same pressure values of synthesis reactor and condenser arranged inside said reactor. Condenser includes large number of flat plate like practically rectangular heat exchangers whose long sides are parallel to reactor axis. Each heat exchanger is made of two placed one onto other metallic sheets mutually joined by welding along their perimeter and forming inside heat exchanger preset-width cavity between them. Sheets from which heat exchangers are made are mutually joined by spot welding and they define in cavity of heat exchangers wavy path for fluid flowing. Said path includes mutually connected portions communicated through branch pipes for inlet of flowing heat transfer agent to heat exchangers and outlet of said agent from it. Preferable ducts for distributing flowing heat transfer agent fed to heat exchanger and for collecting outlet heat transfer agent are formed by means of tubes arranged in inner cavity of heat exchanger and secured to its mutually opposite long sides. At least one heat exchanger has internal partition passing from its one side to other opposite side and spaced from said opposite side by some distance for forming in cavity of heat exchanger U-shaped path for flowing heat transfer agent. Said path has descending and raising portions communicated with respective branch pipes passing outside from heat exchanger. Portions of U-shaped path have smoothly increased cross section area.

EFFECT: simplified design of zone for synthesis and condensation of reaction mixture for producing urea at improved efficiency of the whole process.

15 cl, 7 dwg

Up!