The method of selection of synthetic rubber from latex

 

(57) Abstract:

Usage: the invention relates to methods for selection of synthetic rubber from latex, including wastewater treatment, and can be used in the chemical and petrochemical industries. The invention: the aim of the invention is the reduction of electricity consumption for liquefaction of the refrigerant used in the coagulation of the latex by freezing, excluding consumption of softened water and Talagante on defrosting the coagulum with serum, reducing the loss of fine crumb rubber, disposal main and by-products cleaning serosoderjaschei water, preventing damage to the environment. This objective is achieved in that introduces an additional step of freezing at a pressure more than atmospheric at a given speed from the dispersion of coagulum in the hydrocyclone. Defrosting the coagulum with serum provide warmth vapor degassing crumb rubber from residual monomers. Conduct the concentration of fine crumb rubber in serosoderjaschei water self-cleaning filter of known construction with the return of chips in the process. Additionally purify the filtrate on the membrane by reverse osmosis followed utilizati the school industry. The exhaust heat from the frozen latex exercise with a low-boiling monomer initially at pressure greater than atmospheric and the rate of fall of temperature of the latex 10 - 30 deg/h Separation of vapors of the boiling of the monomer from the emulsion latex at a pressure more than atmospheric carried out due to centrifugal force in the cyclone. The separation of the frozen particles of coagulum from the refrigerant is carried out in newbom conveyor mounted under an angle of 30oto the horizon, and the lower end of the auger above the level of the refrigerant in the coagulator, and the output of the set screw hydraulic lock-separator. Thawing frozen coagulum with serum implement due to heat excess hot serosoderjaschei water and part vapor degassing stage monomers. Conduct the concentration of small chips in serosoderjaschei water using the self-cleaning filter with the output of the filtrate for further purification. Conduct additional cleanup serosoderjaschei water from surface-active substances by reverse osmosis. Thus, implementation of the proposed method will reduce the electricity consumption by the liquefaction of the refrigerant at 10 to 14%, increase process productivity by 28% and 40%, eliminate as consumption of fresh OMA>/t rubber. 1 S. and 3 C.p. f-crystals, 1 Il., table 4.

The invention relates to methods for selection of synthetic rubber from latex, including wastewater treatment, and can be used in the chemical and petrochemical industries.

Known methods for isolating synthetic rubber from latex using electrolytes and freezing [1].

In practice, the most widespread method of coagulation using electrolytes. But this method has significant drawbacks: high consumption of electrolyte (up to 1 t salt/t rubber) and fresh softened water (up to 8 m3/t rubber): salinity wastewater output in treatment facilities.

Another method of separation of synthetic rubber from latex freezing on the wall of the metal roll cooled from inside the refrigerant, characterized by low productivity, contamination of the working area and environment of volatile monomers due to the inability of the sealing site freezing and large power consumption when receiving refrigerant vapor during thawing of coagulum with serum.

Closest to the proposed method is a method of obtaining emulsionnymi with subsequent thawing of coagulum, distillation nesupykit.vasara monomers [2].

The method reduces the emissions of volatile monomers in the environment and reduces the loss of monomers to rubber, increases the productivity of the process.

However, it is characterized by:

- the expenditure of relatively large amounts of power due to the use of a larger number of units comprimises equipment. This is due to the need to increase levels of compression to reduce the total amount of butadiene vapors under vacuum (coagulation 1 ton of rubber consumed 4.5 t reduced butadiene);

- high consumption of heat, water vapor for repulsion of coagulum with serum (for 1 ton of spent rubber 0,7 Gcal of heat).

In addition, in this way not solved the problems of purification and waste water, loss of fine crumb rubber.

The aim of the invention is

- reduction of energy consumption reduction of refrigerant used in the coagulation of latex freezing:

the exception of the consumption of fresh softened water and Talagante on defrosting the coagulum with serum;

- reduction of loss of fine crumb rubber;

- utilization main /P> This objective is achieved in that in the known method the selection of synthetic rubber from latex, comprising the coagulation of the latex by freezing in the environment of the refrigerant under vacuum, the thawing of coagulum with subsequent water degassing nesupykit.vasara monomers of crumb rubber and dehydration:

- bend heat frozen latex exercise with a low-boiling monomer initially at pressure greater than atmospheric and the rate of fall of temperature of the latex 10 - 30 deg/h;

- separation of vapors of the boiling of the monomer from the emulsion latex at a pressure more than atmospheric carried out due to centrifugal force in the cyclone;

- separation of the frozen particles of coagulum from the refrigerant is carried out in a screw conveyor mounted under an angle of 30oto the horizon and the lower end of the auger above the level of the refrigerant and the coagulator, and the output of the set screw hydraulic lock-separator;

- defrosting frozen coagulum carry out due to heat excess serosoderjaschei water and part vapor degassing stage distillation nesupykit.vasara monomers;

- spend the concentration of small chips in serosoderjaschei water using the self-cleaning filter design is clean serosoderjaschei water from surface-active substances by reverse osmosis.

The proposed method can be implemented by the processing circuit shown in the drawing.

The latex obtained by copolymerization of monomers of butadiene with Acrylonitrile or styrene (alfamethylstyrene) in water emulsion, stoppering and directed to the selection of rubber by freezing.

In contrast to the known method introduces an additional step of freezing the latex, where 30 - 40% of all heat in latex plays with a low-boiling butadiene at a pressure greater than atmospheric and the rate of fall of temperature of the latex 10 - 30 deg/h For this hatsudensho mixture with a temperature of plus 5 to 10oC first dispersed in reduced butadiene in a ratio of 1:3, respectively supplied on lines 1 and 2 in the mixer 3. From line 2 of part butadiene is served in a freezing apparatus according to line 4. The resulting emulsion latex in reduced butadiene line 4 is introduced into the lower part of the hollow sealed mixer 5 bubbler type, where and conduct initial stage of freezing of the latex. In bubble mixer 5 in the direction of travel of the emulsion latex from the lower to the upper part due to the pressure drop is intense lash butadiene while cooling down, e is no known method of separation of vapors of the boiling of the monomer from the latex is carried out due to centrifugal force in the cyclone. This vapor-liquid mixture from the upper part of the mixer 5 via line 6 tangentially injected into the cyclone 7. In the hydrocyclone due to centrifugal force is intense squeezing vapor bubbles butadiene latex. Then a couple of butadiene with a pressure of 0.13 - 0.15 MPa on line 8 provide compression.

Cooled to a temperature of from 0 to minus 2oC emulsion latex in residual butadiene in line 9 is choked in the coagulator 10, operating under vacuum, where the final freezing of rubber from latasca due to the low boiling point butadiene (minus 15oC at a residual pressure of 0.08 MPa). In the coagulator 10 on line 4 serves the additional amount of butadiene in the coagulator is supported by the residual pressure of 0.08 MPa (608 mm RT. Art.) due to the operation of vacuum equipment (projectional installation, vacuum pump and compressors). This pressure provides the boiling vapors of butadiene at a temperature of - 15oC. by stirring agitator in the coagulator creates a homogeneous suspension of particles consisting of a coagulum frozen in serum, liquid butadiene. The ratio of the solid dispersed phase to butadiene at the output of the coagulator is supported 1:8 D. EUNIC 14, from which the liquid phase through line 15 goes back to the coagulator, and a pair of line 16 act on the vacuum line.

In contrast to the known method, the flow of slurry pump 12 is directed along the line 17 in the screw conveyor 18 mounted at an angle in the 30oto the horizontal. Butadiene due to the clearance between the auger and the housing flows down the inclined housing screw conveyor line 19 back to the coagulator and frozen particles through the water seal separator 20 receives for defrosting. A pair of butadiene top screw conveyor line 21 enter the drop entrainment 14. From trap separator 20 frozen particles of coagulum with serum comes in a melter 22 with stirrer and jacket.

The separation of the solid dispersed phase from the dispersion medium refrigerant is carried out in the proposed method through the following technical solutions:

installing an inclined auger at an angle 30oto the horizon, which provides transportation of solid disperse phase and at the same time, the leaking refrigerant by an inclined cylindrical housing screw back in freezing apparatus;

the lower end of the screw conveyor must be above the level of liquid refrigerant in the frosting, oroonoko of coagulum and preventing the passage of vapor from the defrosting apparatus in the auger and freezing apparatus, installed hydraulic lock - separator.

In contrast to the known method of thawing frozen coagulum with serum implement due to heat excess hot serosoderjaschei water and part vapor degassing stage distillation nesupykit.vasara monomers. A portion of the vapor degassing and hot excess crude serosoderjaschei water is introduced into the melter 22, and the excess filtered serosoderjaschei water in the jacket of the melter. In melter 22 frozen particles of coagulum with serum was thawed by the heat serosoderjaschei water and vapor degassing, with the formation of crumb rubber in the serum, diluted with condensate vapor degassing.

A pair of butadiene from the melter 22 come on line 23 into the vacuum manifold.

Next, the aqueous slurry of crumb rubber from melting 22 on line 24 serves to the pump 25 and line 26 - in degasser first stage 27. Part of the vapor degassing line 28 into the vacuum manifold, as part of their on line 29 serves in the melt 22. Pulp rubber of the degasser 27 through line 30 enters the pump 31, and from there to the second step of degassing in the crystallizer 32. A pair of the crystallizer 32 are received by the line 33 in degasser first stage 27, and the fresh water vapor priori rubber SKI-3, SKD. Degassed slurry crumb rubber from the crystallizer 32 serves first in line 35 and pump 36, and then through line 37 to the hillshade from the emulsifier in the collection with a stirrer 38. Washing spend softened water, which is served on top of the device. The washed pulp on line 39 is supplied to the pump 40 and further through the line 41 is fed to the vibrating screen 42 to separate from the base serosoderjaschei water. Pets feeding degassed slurry immediately after line 37 to the vibrating without washing. Dewatered crumb rubber after the shaker send for drying a known manner. In turn serumderived water after vibrating screens is collected in the collector 43, from which on line 44 by the pump 45 is served by line 46 to the filter 47 for further purification and heat recovery.

In contrast to the known method, spend the concentration of small chips in serosoderjaschei water using the self-cleaning filter design by the author. St. 1669491 (USSR) from 19.06.89 output filter for extra cleaning. The ratio of flows of the pulp crumb rubber to filtered serosoderjaschei water is 1:(1-2). Concentrate fine crumb rubber in serosoderjaschei water filter 47 line 48 goes to defrost in the melter 22, and clean under 53 serves for heating the jacket of the melt 22. The water is then taken from the top through line 54 and is directed to additional cleaning of surface-active substances (surfactants).

In contrast to the known method, perform additional cleanup serosoderjaschei water from surface-active substances by reverse osmosis. For this water line 54 is directed to the reverse osmosis 55, from which derive two threads. Inhalation in water first thread 56 on line 57 is supplied to the washing of the crumb rubber in the apparatus 38, and the excess water on line 58 serves for the preparation of the aqueous phase to the Department of polymerization. Concentrated surfactants on line 59 available for sale as a commercial product. The ratio of the flows coming from the reverse osmosis plant, water surfactant solution: inhalation water is 1:10. The concentration of surfactant in solution is increased about 10 times, compared with the content of the surfactant in the original serosoderjaschei water.

Example 1(control). The selection of rubbers SKN-26, SCS-ARC latex with an outlet temperature of polymerization of 5 and 7oC carry out the known method described in the prototype. Latex is dispersed to the environment reduced butadiene and coagulated in a single phase by freezing under vacuum (mind spending by direct mixing with hot water and acute water vapor. Treatment and disposal serosoderjaschei waste water does not conduct.

The known method is characterized by the indicators presented in the table. 1.

For known way of low productivity stage vacuum coagulation of latex due to the complexity of the challenge a large number of discharged vapors of butadiene from the zone of freezing, as well as a large power consumption reduction discharged butadiene (4.5 t/t rubber), as well as a large consumption of fresh softened water and warmth and water vapor, respectively, the discharge of polluted waste water, loss of fine crumb rubber.

Example 2.

The selection of rubbers SKN-26, SCS-ARC latex with an outlet temperature of polymerization of 5 and 10oC carry out the proposed method. The latex is coagulated by freezing in two stages. The initial stage of Sahelian latex is carried out at a pressure above atmospheric in hydrodynamic mixer bubbler type. The separation of butadiene vapors from the gas-liquid flow implemented in the cyclone when the pressure is 0.135 MPa. The final stage of Sahelian carried out under vacuum (residual pressure of 0.08 MPa and a temperature of - 15oC. Thawing of coagulum with ceremonie in table. 2, 3.

For the proposed method is characterized by improving the efficiency of end-stage vacuum coagulation of the latex, which is manifested in the increase of productivity and reduction of power consumption during the liquefaction of the refrigerant. This is achieved by pre-scholarone latex at a pressure more than atmospheric and reducing the discharged vapor refrigerant.

Further redistribution of the heat load from the final stage of coagulation in an initial increase in the rate of fall of temperature of the latex more than 30 deg/h impractical due to the decrease in the performance of the initial stage to the stabilization of energy consumption. In turn decrease the rate of fall of temperature of the latex is less than 10 deg/h leads to waste of energy due to the increase in the share of discharged refrigerant vapor.

Example 3.

The selection of rubbers SNK-26, SCS-ARC latex exercise on the proposed method, similarly to the conditions described in example 2. The rate of temperature drop of the latex in the initial stage of freezing withstand 20 deg/h In serosoderjaschei waste water concentrate a fine crumb rubber and concentrate return ocess polymerization (table. 4).

Thus, implementation of the proposed method will reduce the electricity consumption by the reduction of the refrigerant at 10 to 14% by reducing the gradation compression butadiene, will increase the process productivity by 28% and 40%, eliminate as consumption of fresh softened water, and consumption of Talagante on defrosting the coagulum with a serum that will significantly reduce the discharge of waste water (up to 1.0 m3/t rubber) and loss of fine crumb rubber will prevent the reset from the environment wastewater containing mineral salts and surfactants.

Sources of information:

1. O. B. Litvin. The basic technology of synthesis of rubber. - M.: 1972, S. 292 - 311, 334 - 335, 347 - 351.

2. Copyright certificate, 454807, C 08 C 1/14, 1991.

1. The method of selection of synthetic rubber from latex, comprising the coagulation of the latex by freezing in the environment of the boiling refrigerant under vacuum, the thawing of coagulum with subsequent water degassing nesupykit.vasara monomers of crumb rubber and dehydration, characterized in that carry out the removal of heat from the frozen latex evaporation of low-boiling monomer initially at a pressure more than atmospheric, the rate of fall of temperature of the latex 10 - 20 gra is the W frozen coagulum is conducted by the heat of excess hot serosoderjaschei water and part vapor degassing stage distillation nesupykit.vasara monomers.

2. The method according to p. 1, characterized in that the separation of the frozen particles of coagulum from the refrigerant is carried out in a screw conveyor installed at an angle in the 30oto the horizon and the lower end of the auger above the level of the refrigerant in the coagulator, and the output of the set screw hydraulic lock-separator.

3. The method according to p. 1, characterized in that the conducting concentration of fine crumb rubber in serosoderjaschei water using the self-cleaning filter with the output of the filtrate for further purification.

4. The method according to p. 1, characterized in that the conduct additional cleanup serosoderjaschei water from surface-active substances by reverse osmosis.

 

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FIELD: chemistry.

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6 ex, 3 dwg, 2 tbl

FIELD: chemistry.

SUBSTANCE: aged 21-200 days after production, briquettes containing an antioxidant and ground vegetable material are ground and mixed with a non-polar organic solvent and with a polar organic solvent. Then removing a large part of the bagasse from the suspension and getting miscella and the first portion of bagasse. Removing 80-95 wt % of bagasse from the miscella. It is possible to post-treat the miscella until a clarified rubber solution is obtained. By adding an additional polar solvent and/or by removing the non-polar solvent, rubber coagulation is carried out and a purified, hard rubber is obtained.

EFFECT: invention makes it possible to reduce the cost of obtaining rubber from non-seringa plants.

7 cl, 2 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: method involves the use of briquettes from compressed, crushed plant material of 1.5" or less, containing bagasse, rubber, residual water and not more than 5 wt % of the leaves. The density of briquettes is 40-325% higher than the density of unpressed vegetable material. A purified, hard rubber is obtained which contains 0.05-0.5 wt % of impurities, 0.2-1.5 wt % of ash and 0.1-4.0 wt % of the resin if it is dried to such a state that it contains 0.8 wt % of volatile substances.

EFFECT: method makes it possible to improve the isolation of rubber from a plant that is not hevea.

6 cl, 10 tbl, 9 ex

FIELD: agriculture.

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EFFECT: invention allows to increase rubber content while processing a material other than Hevea.

6 cl, 4 tbl, 2 ex

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