The method of selection of synthetic emulsion rubbers

 

(57) Abstract:

The invention relates to the chemical and petrochemical industry, and is intended to highlight the synthetic emulsion rubbers. Spend the coagulation of rubber latex in the presence of ceremnoy water, sulfuric acid and coagulating additives, washing of the crumb rubber residue from the acid coagulating additives, extraction and drying of rubber, collection ceremnoy, washing and drying of the water. The concentration of crumb rubber contained in ceremnoy, washing and drying the waters carried out by feeding the thread to the appropriate delimiter phases through the nozzle into the gap between the casing and the filter element while maintaining the flow rate of the concentrate 15-25 m/s the phase Separator is installed between the cylindrical housing and a filter element spiral septum. Step spiral septum decreases from the nozzle to the exit by an amount inversely proportional allocated to the filtrate. Concentrate ceremnoy water serves on the stage of coagulation, the filtrates for the preparation of solutions coagulating agents, water-concentrate - on stage cleaning rubber. Residual water output for biological treatment. The technical result is an increase misintelligence emulsion rubber from latex, in particular to cleaning ceremnoy, washing and drying of the waters, and can be used in the chemical and petrochemical industries.

A known method of extraction of rubber from latex, comprising the coagulation of the latex solutions coagulants in the presence ceremnoy water washing and neutralization of crumb rubber from the remnants of coagulants softened water in the presence of alkali, extraction and drying of rubber, collection ceremnoy, washing and drying water, removing the polymer particles from a mixture of the collected sewage sludge with subsequent periodic return is in the process of coagulation of the latex [production Process regulations rubbers SKS-30 ark, SKMS-30 apkm-27, TR-1.03.162-85, S. 59-68].

The disadvantage of this method is the considerable consumption of softened water when washing rubber, loss of organic acids, not the complete removal of the polymer from the serum, washing and drying of the water. Periodic return in the coagulation cascade small crumbs of polymer from the upper part of the tank leads to the dilution of coagulants in ceremnoy water and, as a consequence, there is a partial coagulation of the latex. Introduced in a large number of small crumb polymer destabilizes the operation of the hub, expeller and dryers.

The main disadvantages used in this way to separate the phases are:

- filter element becomes clogged with tiny particles of crumb rubber that falls inside the pores. In addition, since a precipitate of emulsifiers;

the clogging of the filter element is uneven, i.e., at the entrance less, and more, which dramatically reduces the mileage of the filter between cleanings (250-300 hours). It is connected first of all with considerable the lute of the invention is to stabilize the cleaning process ceremny and wash water and increase turnaround of the filter element.

This goal is achieved by the fact that in the known method the selection of synthetic emulsion rubbers by coagulation of rubber latex in the presence of ceremnoy water, sulfuric acid and coagulating additives, washing of the crumb rubber residue from the acid coagulating additives, pressing and drying of rubber, including the collection ceremnoy, washing and drying of water, the concentration of crumb rubber contained in ceremnoy, washing and drying the waters by filing a thread in the appropriate phase separator through the nozzle into the gap between the casing and the filter element, with subsequent supply of concentrate ceremnoy water on stage coagulation of the leachate for the preparation of solutions coagulating agents, water concentrate - stage cleaning rubber and conclusion water residues for biological treatment, the concentration of crumb rubber contained in ceremnoy, washing and drying the waters carried out while maintaining the flow rate of the concentrate 15-25 m/s in the phase separator having installed between the cylindrical housing and a filter element spiral wall with a pitch decreasing from the nozzle to the exit by an amount inversely proportional allocated to the filtrate.

This goal served in the phase separator (Fig. 1), consisting of a cylindrical body 1, the filter element 2 and the input pipe 3, through which is supplied the initial mixture in the gap between the casing and the filter element, which has a spiral partition 4, with a pitch decreasing from the nozzle to the exit by an amount inversely proportional allocated to the filtrate. This contributes to maintaining the high speed of the aqueous phase in the phase separator and centrifugal forces drop small crumb rubber to the outer wall of the housing and the preservation of a layer of pure liquid in contact with the filter element. High speed of water flow is maintained from input to output of the phase separator, which can dramatically reduce the accumulation of crumb rubber on the filter element and to significantly increase its service life (mileage between cleanings), up to 3 months. The concentrate output from the phase separator through pipe 5, and the filtrate through the pipe 6. The use of the method according to the patent N 2048476 required to carry out the Stripping and cleaning the filter after every 10-15 days.

This goal can be achieved as follows (see Fig. 2). Latex on line 1Ithe emulsion of oil and antioxidant line 1II, aqueous coagulating iantosca. Formed seranna water line 2 enters the collector 3. From collection 3 seranna water pump 4 is fed to the phase separator 5, which is used to clear ceremnoy water from fine crumb rubber. Enter ceremnoy of water through the nozzle into the gap between the casing and the filter element, which has a spiral wall with a pitch decreasing from the nozzle to the exit by an amount inversely proportional allocated to the filtrate to maintain the flow rate of the concentrate (water phase with a high content of crumb rubber) from 15 to 25 m/s (see Fig. 1). From the phase separator 5 water flow of the filtrate is fed through line 6 to the preparation of solutions of coagulants and concentrate ceremnoy water line 7 returns to the stage of coagulation. Received crumb rubber is supplied via line 8 into the compartment 9 to washing to remove residual coagulating agents, acids. After cleaning the crumb rubber is fed to push the car. Wash water containing a small amount of fine crumb rubber, going on line 10 in the collector 11. From the collection of 11 wash water is directed by the pump 12 in the phase separator 13 through the pipe into the gap between the casing and the filter element, in cotroversial given to the filtrate to maintain the flow rate of the concentrate 15-25 m/s Water-rubber dispersion (concentrate) is returned via line 14 to the stage of washing, and the treated aqueous phase (filtrate) in line 15 is displayed or biological treatment, or used to prepare solutions coagulating agents, alkali solution and the other Of the branch cleaning 9 crumb rubber on line 16 is directed into the compartment 17 on the extraction and further along the line 18 through the drying compartment 19.

Example 1 (control).

The selection of the rubber latex is conducted by a known method. The latex rubber SKS-30 apkm-15 and SKS-30 apkm-27 before coagulation filled respectively with oil MO-6 and antioxidant SU-1. Coagulation of the latex SCS-30 AMIS spend an aqueous solution of protein hydrolysate, latexes SCS-30 apkm-15, SKS-30 apkm-27 and SKMS-30 ARC - salt solution in the presence of sulfuric acid and ceremnoy water. The number of excess ceremnoy water to be displayed on a local cleaning is for rubbers allocated from latex SCS-30 apkm-15, SKS-30 AMIS, SCMS-39 ARC, SKMS-30 apkm-27 - 4.2 m3/t rubber. Washing of the crumb rubber hold fresh partially softened water in the amount of 12 m3/t rubber. The total quantity of waste water discharged into HSC through the sump was for kuchukashvili 28 g/m3. Loss of crumb rubber with sewage listed rubbers reached 0.43 kg/ton of rubber SK(M)C.

The top layer of the slurry consisting of fine crumb rubber, periodically pumped into the apparatus coagulation of the latex through every 4 hours. The volume of a single pumping slurry is 20 m3. The latex flow in the coagulation cascade was interrupted for 0.5 hour. Development of rubber on one production line was 28 tons per shift. The actual consumption of table salt and sulfuric acid, respectively, 200 and 20 kg/ton of rubber.

Example 2.

The selection of rubber from latex of the proposed method.

Oil-filled latex SCS-30 apkm-15 and SKS-30 apkm-27 before serving coagulation fill with oil and antioxidant SU-1. Coagulation of the latex SCS-39 AMIS, SKS-30 ark carried out with a solution of protein hydrolysate, oil-filled latex rubber SKS-30 apkm-15 and SKS-30 apkm-27 coagulate in the presence of 24-26% aqueous solution of sodium chloride, sulfuric acid and ceremnoy water.

In the process of extraction of rubber in the expeller receive the aqueous phase in a quantity of 1.0 m3/t rubber. The performance of one process trains on rubber 4.0 t/h or 32 tons/shift. Seranna water s is returned to the apparatus for the coagulation of the latex, as the filtrate, representing the excess aqueous phase, in the amount of 4.2 m3/t is directed to the preparation of solutions of coagulants.

The washing water is collected in a collection and then pump through the pipe is introduced into a phase separator where the concentrate is returned to the step of washing the rubber, and the filtrate is sent to biological treatment.

As a filtering partition in the phase separator ceremnoy and wash water has a hard mesh glass, the outer surface of which is coated with a layer of the filter element with a pore size of 0.01-0.1 mm Serum and wash water containing a small crumb rubber, inserted through the nozzle with a speed of 15-25 m/s in the phase separator, which has a spiral baffle step, which decreases from the inlet to the outlet nozzles, which allows to maintain a high speed (15-25 m/s) at the output of the concentrate. This in turn significantly reduces clogging of the filter element. A significant drawback of the filter elements used in the patent 2048476 is a sharp decrease turbulence and velocity of the water flow of concentrate to the exit of the separator phases, which leads to the accumulation of crumb rubber filter re is it because of the diversion of a significant amount of the filtrate (aqueous phase). Data on the effect of flow rate on the duration of the separator phases are presented in tables 1 and 2.

The method of selection of synthetic emulsion rubbers by coagulation of rubber latex in the presence of ceremnoy water, sulfuric acid and coagulating additives, washing of the crumb rubber residue from the acid coagulating additives, pressing and drying of rubber, including the collection ceremnoy, washing and drying of water, the concentration of crumb rubber contained in ceremnoy, washing and drying the waters by filing a thread in the appropriate phase separator through the nozzle into the gap between the casing and the filter element, with subsequent supply of concentrate ceremnoy water on stage coagulation of the leachate for the preparation of solutions coagulating agents, water concentrate - stage cleaning rubber and conclusion water residues for biological treatment, characterized in that the concentration of crumb rubber contained in ceremnoy, washing and drying waters, carried out while maintaining the flow rate of the concentrate 15 - 25 m/s in the phase separator having installed between the cylindrical housing and a filter element spiral wall with a pitch decreasing from the nozzle to

 

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Conical thickener // 2260468

FIELD: sewage purification equipment.

SUBSTANCE: the invention is intended for purification of sewage in processing lines of sewage mechanical separation and impurities contained in them. The thickener contains a body, a filter component mounted inside it, which are made in the form of curvilinear surfaces dilating top-down, a conical splitter placed on the upper part of the filter component, branch-pipes of a source slurry feeding and withdrawal of the liquid and solid fractions, impermeable and made in the form of a spiral-screw partition mounted between the body and the filter component with formation of a curvilinear channel dilated downward with the length exceeding in two - three times the length of the generatrix of the side surface of the filter component. The sharp part of the splitter is located in the branch-pipe of source slurry feeding for its uniform distribution on the lateral surfaces of the filtering component by a thin layer. The technical result of the invention is an increased efficiency, cost-saving, compactness, reliability and ease of maintenance. The thickener may be used device can appear in roles of the self-maintained device for separation of suspended matters with loose structure.

EFFECT: the invention ensures increased efficiency, cost-saving, compactness, reliability and ease of maintenance.

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