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Recovery and separation device of vinyl chloride-vinyl acetate copolymer resin polymeric unreacted monomers and a method

A technology of vinyl chloride copolymer resin and separation equipment, which is applied in the chemical industry, can solve the problems such as self-polymerization affecting the normal operation of the recovery device, and achieve the effect of solving the problem of separate condensation and recycling, reducing cooling capacity consumption, and reducing monomer consumption

Inactive Publication Date: 2017-08-25
XINJIANG CORPS MODERN GREEN CHLOR ALKALI CHEM ENG RES CENT LTD
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Problems solved by technology

[0007] The purpose of the present invention is to solve the problem of separate recovery and reuse of vinyl acetate gas phase and vinyl chloride gas phase in the unreacted monomers of vinyl acetate copolymer resin polymerization, and then provide a kind of practicability that realizes the separate recovery of vinyl acetate monomer and vinyl chloride monomer Recycling equipment and methods effectively solve the problem that vinyl acetate is prone to self-polymerization during the compression process and affects the normal operation of the recovery device

Method used

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  • Recovery and separation device of vinyl chloride-vinyl acetate copolymer resin polymeric unreacted monomers and a method

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[0022]Example: The slurry is discharged from the discharge pipe at the bottom of the polymerization tank to the recovery tank after the reaction of the polymerization tank is completed during the production of vinyl chloride copolymer resin. The main components of the slurry are water, vinyl chloride resin, and unreacted monomer vinyl chloride gas phase. In the gas phase with vinyl acetate, the slurry temperature is around 45-65°C, and the solid content is 20-30%. The slurry contains residual dispersant, and the slurry enters from the tangential direction of the upper part of the recovery tank, which is beneficial to prevent foam and resin splashing due to the impact of the slurry on the liquid surface of the slurry. When recovering unreacted monomers, the recovery of the gas phase will take the foam away. The entrained resin particles and recovered gas phase in the foam enter the next process; the water and vinyl chloride resin in the slurry are temporarily left in the recover...

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Abstract

The invention achieves recovery and separation reuse of polymeric unreacted vinyl acetate monomers and vinyl chloride monomers of vinyl chloride-vinyl acetate copolymer resin respectively, and solves the problems that self-aggregation happens to vinyl acetate of the vinyl chloride-vinyl acetate copolymer resin polymeric unreacted monomers in a compress process, and normal operating of a recovery device is influenced. The device and a method are beneficial to the recovery of the monomers and the resin in production, monomer consumption and resin consumption of production cost are lowered, cold energy consumption in a pressure condensing process is low, productive integration energy consumption is effectively lowered, the vinyl acetate monomer self-aggregation phenomenon is solved, stable and safe operating of the device is guaranteed effectively, and the device has good popularization and application prospects.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and relates to a recovery and separation equipment and method for suspension polymerization unreacted monomers, especially for recovering two unreacted components of vinyl acetate monomer and vinyl chloride monomer in the polymerization of vinyl chloride-vinegar copolymer resin Separation equipment and methods. Background technique [0002] In the production of general-purpose polyvinyl chloride resin by the suspension method, the discharge of the polymerization kettle is generally recycled directly into the vinyl chloride gas cabinet, that is, the discharge of the polymerization kettle is sent to the recovery tank, and the recovered gas passes through the collector to collect the resin entrained in the recycled gas. Finally, the gas phase directly enters the vinyl chloride gas cabinet, and the vinyl chloride in the gas cabinet is sent to the synthetic rectification system through the c...

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Application Information

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IPC IPC(8): C08F214/06C08F218/08C08F6/24
CPCC08F6/24C08L27/06C08L31/04
Inventor 宋晓玲周军黄东沈姗姗王祖芳贺盛喜魏东
Owner XINJIANG CORPS MODERN GREEN CHLOR ALKALI CHEM ENG RES CENT LTD
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