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Method of producing suspension-type anti-turbulence additive for reducing hydrodynamic resistance of hydrocarbon liquids

IPC classes for russian patent Method of producing suspension-type anti-turbulence additive for reducing hydrodynamic resistance of hydrocarbon liquids (RU 2481357):
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Method of controlling bimodal catalyst activity during polymerisation Method of controlling bimodal catalyst activity during polymerisation / 2479593
Method of conducting a polymerisation reaction in a gas phase polymerisation reactor to obtain a bimodal polymer while controlling activity of a bimodal polymerisation catalyst composition in the reactor by controlling concentration of at least one induced condensing agent (ICA) in the reactor. The ICA is hexane, isohexane, pentane, isopentane, butane, or isobutane, and the bimodal catalyst composition includes a Group 15 and metal containing catalytically active compound (HMW catalyst for catalysing polymerisation of a high molecular weight fraction of the product), and a metallocene catalytically active compound (LMW catalyst for catalysing polymerisation of a low molecular weight fraction of the product).

FIELD: chemistry.

SUBSTANCE: invention relates to pipeline transportation of liquid hydrocarbons and specifically to methods of reducing hydrodynamic resistance of said liquids. Described is a method of producing a suspension-type anti-turbulence additive. The method involves producing a fine-grained polymer which is soluble in carbonaceous liquids. The polymer is synthesised by (co)polymerisation of higher α-olefins under the action of a Ziegler-Natta catalyst. The (co)polymer of higher α-olefins used is a casting polymerisation product. A fine dispersion of the polymer is obtained by thermal re-precipitation of the polymer in a liquid which is a nonsolvent for the polymer at room temperature and capable of dissolving it at a higher temperature.

EFFECT: improved quality of the polymer component, cutting the volume of solvents, reduced environmental load.

2 ex

 

The present invention relates to the field of pipeline transportation of liquid hydrocarbons, namely to methods of reducing their hydrodynamic resistance.

Recently, to increase throughput of oil and oil product pipelines applied polymer anti-turbulent additives (PTP). They represent a solution or suspension of the polymer in a liquid medium. The polymer must be dissolved in the fluid and to have a high molecular weight. Another necessary condition for the manifestation of the effect of reducing the hydrodynamic resistance (Toms effect) is the turbulent regime of flow of the hydrocarbon fluid in the pipeline.

The introduction of PTP in the flow of oil in an amount of 10-50 grams per ton, increases the performance of the pipeline by 15-25%. The higher molecular weight polymer, the lower the concentration needed to achieve this magnitude of reduction of the resistance.

As the polymer component is most often used ultra-high molecular weight (co)polymers of higher α-olefins, synthesized catalysts of the Ziegler-Natta. Among other oil-soluble polymers, they still have no equal in terms of price-quality. Use monomers with the number of carbon atoms of 6 to 16.

Originally PTP was released in the form of RA, the creators of the polymer in gasoline (kerosene). However, the difficulties with downloading because of its high viscosity, especially in winter, has resulted in the currently used anti-TB drugs of the suspension type. Preparing a suspension, usually by grinding product block polymerization of higher α-olefins, representing koutsokoumnis material at a temperature below its glass transition temperature, and the obtained polymer crumb of a certain size are mixed with a liquid medium that does not dissolve the polymer. The liquid medium are selected so that its density is only slightly different from the density of the polymer to avoid irreversible separation of the suspension during storage. The content of polymer in PTP suspension type can be up to 25% and even more, that far exceeds the content of the polymer in the insertion tool the mortar type. In the composition of the solid phase anti-TB drugs may include surface-active substances (surfactants), or other antiglomerular, which prevent the sticking of polymer particles, and additives inhibitors of oxidative degradation of polymers.

Polymerization in the environment of the solvent gave the place another block and for reasons of magnitude of the molecular weight of the polymer when the polymerization unit is much higher, and therefore, the polymer obtained is of higher quality.

Traditional technology suspension agent reducing hydrodynamic the definition of resistance can be divided into three stages:

1. Block polymerization of monomers (comonomers)

2. Grinding kauchukopodobnoe (co)polymer

3. Preparation of suspension, resistant to delamination

In a large number of patents related to a method for PTP suspension of the type described by cryogenic grinding of polymers [U.S. Pat. USA 4826728, Pat. USA 4720397, Pat. USA 4340076]. As the polymers and copolymers of higher α-olefins are koutsokoumnis materials with low glass transition temperature (poly-1-octene, for example, has a glass transition temperature below minus 70°C), mechanical grinding is carried out in the environment of liquid nitrogen, i.e. below their glass transition temperature.

However, it is known that working with liquefied gases associated with increased risk and requires special, expensive equipment, and certain security measures for personnel. Furthermore, liquid nitrogen is an expensive material. Therefore, in recent years, many companies are working to create a non-cryogenic grinding technology poly-alpha-olefins [U.S. Pat. USA 6946500, Pat. USA 6894088, Pat. USA 7271205, Application for U.S. Pat. USA 0276566, Application for U.S. Pat. USA 0287568]. Use pre-impregnated hydrating agents, which use heavy alcohols; solid and liquid separating agents (derived stearic acid, higher linear alcohols), and SP is a special equipment (homogenizers, attrition mills, shredders rotor-stator type).

It should be noted that the additive suspension type must contain finely ground polymer, or the process of dissolution of the polymer in the pipeline is too long, which will affect the resulting effectiveness of PTP. On the other hand, the mechanical grinding of polymers, especially fine grinding to particles of the order of 100-300 microns, leads to partial mechanochemically macromolecules and quality degradation of the polymer.

To avoid mechanical destruction can be, for example, by using encapsulated polymerization of higher α-olefins [U.S. Pat. USA 6126872, Pat. USA 6160036, Pat. USA 4693321, Application for U.S. Pat. USA 20030013783]. Its essence is that the droplets of the monomer containing the catalyst is enclosed in a polymer shell and suspended in the medium, not dissolving none of the components of the capsules. Thus the micro block polymerization, and dispersion polymer is obtained in one stage in the synthesis process. A significant drawback is the low efficiency of the process.

An alternative method of obtaining a fine dispersion, which does not affect the length of the polymer molecules, is the precipitation of polymer from solution by adding a precipitant [U.S. Pat. USA 5733953]. This method is the closest to the present invention, and was taken as a prototype.

In the above method, the precipitated polymer having a high molecular weight of the synthesized (co)polymerization of higher α-olefins under the action of a catalyst of Ziegler-Natta in the solvent environment.

The sequence of receiving the suspension is as follows (quote): "low-viscosity highly concentrated suspension of polymer is produced by slow addition of liquid not dissolving the polymer (for example, isopropyl alcohol), solution of polymer in solvent (such as kerosene). If enough add herstories the polymer precipitates out of solution as fine particles. Liquid sludge is separated, the residue is again washed with aristotelem. The obtained concentrated suspension with the introduction of a stream of hydrocarbon fluid dissolves quickly and has a lower hydrodynamic resistance".

The disadvantages of the prototype include the following:

- Low quality polymer component

- The need to regenerate a large amount of solvents

- Pollution

The objective of the invention is improving the quality of the polymer component, reducing the amount of solvents, reducing the environmental load.

The technical solution of the proposed method is a block polymerization of the monomer (monomers) and the conversion of the polymer in suspension anti-turbulent PR is your batch by the method of thermal resultant deposition rates.

In the present invention as a polymer component of PTP uses the product (co)polymerization of higher α-olefins in the mass of the monomer (monomers) in the presence of a catalyst of Ziegler-Natta, preferably trichloride titanium in combination with diethylaluminium.

In the present invention to obtain a finely dispersed suspension is proposed to use thermal pereosazhdeniya (co)polymers of higher a-olefins in the liquid, which forms a polymer system with an upper critical temperature of mixing, the value of which lies above +40°C.

Such a fluid is nerastvorim for the (co)polymer at a temperature close to the room temperature, and becomes solvent at a temperature above the critical temperature of the mixture. The latter may be, for example, +60°C. Then the temperature of the environment even when operating additives in southern latitudes will not exceed this value. Otherwise, the suspension will become koutsokoumnis material, practically unsuitable for introduction into the pipeline by any device.

Molecule herstories must contain at least one heteroatom (oxygen, nitrogen, sulfur, phosphorus, fluorine), as with all liquid hydrocarbons, aliphatic or aromatic, polymers of higher α-olefins to form true solutions.

Solvent JV is the ability of a liquid medium can be varied, using these or other solvents, and consequently, to lower or raise the temperature of complete mixing, if it is needed.

Procedure obtain a suspension additives, including stage thermal resultant deposition rates, looks like this:

1. Homo - or copolymerization of higher α-olefins (C6-C16) in the mass of the monomer under the action of a catalyst of Ziegler-Natta to deep conversion of monomer (monomers). When the (co)polymerization of higher olefins as comonomers, it is permissible to use a number of lower olefins C2-C5. Preferably the catalytic system consists of trichloride titanium and diethylaluminium.

2. Pre-grinding of the product block polymerization at room temperature for particles larger than 1 mm According to our data, such grinding does not cause noticeable mechanochemically and not affect the quality of the polymer.

3. Mixing at room temperature powdered polymer; liquid, which nerastvorim for the polymer at room temperature and the solvent at an elevated temperature; and, if necessary, of antiglomerular and inhibitor degradation in the ratio corresponding to the final formulation additives.

4. Dissolution of the polymer in the liquid at an elevated temperature.

5. Cooling the mixture to room rate is atory, obtaining the commodity form of the suspension of the additive.

Thus, as a (co)polymer of higher α-olefins using the product block polymerization, to obtain a suspension of polymer instead of deposition from solution using thermal pereosazhdeniya in the liquid, which nerastvorim for the polymer at room temperature and is able to dissolve at higher temperatures.

Thermal pereosazhdeniya polymer has a number of advantages compared to precipitation of polymer from solution, described in the prototype:

First, the present invention uses a block (co)polymer of α-olefin (α-olefin), which has a higher molecular weight than the product of the (co)polymerization of α-olefin (α-olefin) in the solvent environment.

Secondly, when thermal presideni the ratio of polymer-solvent can be adjusted to meet the recipes prepared additives, i.e. the content of the polymer can be increased up to 23% or more. This eliminates the need to regenerate an excessive amount of solvents as in the case described in the prototype.

Third, particles of a polymer obtained by thermal deposition, are uniform in size and be on the order of 250 microns, which ensures its rapid dissolution in hydrocarbon liquids.

Fourth, the CE stage polymerization to the resultant deposition rates are virtually waste-free, that significantly reduces the environmental load.

The essence of the proposed method is illustrated by examples:

Example 1.

In a reaction vessel at room temperature downloaded 400 ml of 1-hexene and lost it within 20 min of gaseous nitrogen. Then, with stirring, while maintaining the nitrogen cushion consistently made 35 ml of diethylacetanilide (DEAH) in kerosene concentration of 97 g/1000 ml and 0.16 G. of TiCl3in the form of a suspension in heptane. Suspension of TiCl3in heptane contained a number of vitaminology ether as a polymerization accelerator. After 20-30 min of stirring when the reaction mixture had bought a small viscosity, testified to the beginning of the polymerization, it was unloaded in a plastic container, which is tightly corked. Further polymerization was carried out without stirring at ambient temperature, which was initially maintained in the range from 0 to +5°C and then brought to room. After reaching 90% conversion of the monomer obtained koutsokoumnis material was unloaded from the container and crushed at room temperature to a particle size of 2-3 mm

Then at room temperature was preparing a mixture of: polymer crumb:amide stearic acid:1-hexanol:onomatology broadcast dipropyleneglycol in a weight ratio of 27.0:2,5:47,0:23,5. The total mass of the mixture with the Tawil 100 grams. Next, the mixture was heated to a temperature of 60°C and kept at low stirring in an atmosphere of nitrogen gas until complete dissolution of the polymer. Then the obtained viscoelastic mass with weak stirring, cooled to room temperature. A viscoelastic mass turned into a low-viscosity suspension.

Adding the suspension to aviation kerosene in the amount of 0,00022% (2,2 ppm) caused a reduction in its hydrodynamic resistance by 30% in the turbulent flow regime. The tests were carried out on the laboratory bench.

Example 2

In a glass reactor with a volume of 2 l was loaded in the current of nitrogen gas 300 ml of 1-hexene and 700 ml of 1-mission. The mixture of monomers were purged with nitrogen for 20 min, then brought to 60 ml TEACH in kerosene concentration of 120 g/1000 ml Then made a 0.4 g TiCl3. After 30 minutes of stirring in nitrogen atmosphere, when the reaction mass has acquired the consistence of liquid jelly, it was unloaded from the reactor in a stream of nitrogen, rasfasovat 2 plastic container with a volume of 0.5 l each. Further polymerization proceeded without stirring at a temperature of +10°C and then at room temperature. After reaching 85% degree of conversion of monomer (by weight) copolymer was removed from the container.

A sample of polymer in the amount of 100 g to grind at room temperature to a particle size of 1-3 mm and SRAS is mixed with a liquid, consisting of 275 g butyl ether 2-ethylhexanoic acid and 25 g of propylene glycol. To the mixture was added 0.1 g of Irganox 1010, which is an inhibitor of thermooxidative degradation of the polymer, and 4.5 g of distearate calcium. The mixture was heated to 80°C and kept at this temperature until complete mixing of the polymer and the liquid phase. Then, using efficient cooling and weak mixing, brought the temperature of the mixture to 20°C. this formed a low-viscosity suspension polymer with an average particle size of 250 microns.

Note that the residual monomer, not entered in block polymerization (in this example, it is primarily the mission), when the grinding of the polymer and presideni is not lost, and becomes a component of mixed herstories.

Adding the suspension to motor gasoline AI 95 number 0,00026% (2,6 ppm) caused a reduction in its hydrodynamic resistance by 30% in the turbulent flow regime. The tests were carried out on a laboratory stand.

Application of the proposed method improves the quality of the polymer component, reduces the amount of solvents, reduces the environmental load. This is achieved by applying the block polymerization of a monomer (monomers) and conversion of the polymer in suspension anti-turbulent additive method thermal resultant deposition rates.

The method of obtaining protivotrov nteu additives suspension type, reducing hydrodynamic resistance to hydrocarbon fluids, including the production of finely ground polymer soluble in hydrocarbon liquids having a high molecular weight of the synthesized (co)polymerization of higher α-olefins under the action of a catalyst of Ziegler-Natta, characterized in that the (co)polymer of higher α-olefins using the product block polymerization and to obtain a fine suspension of the polymer using thermal pereosazhdeniya in the liquid, which nerastvorim for the polymer at room temperature and is able to dissolve at elevated temperatures.

 

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