Method for solvent refining during isoprene rubber production

A solvent refining and isoprene rubber technology, applied in the field of synthetic rubber production, can solve the problems of high production cost, high energy consumption, large equipment investment, etc., and achieve the effect of reducing the top vent flow and reducing the consumption of solvents

Inactive Publication Date: 2012-06-20
广东鲁众华新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the use of two rectification towers in the double-tower process, the process is more complicated, the equipment investment is large, and the energy consumption is high, so the production cost is relatively high

Method used

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  • Method for solvent refining during isoprene rubber production
  • Method for solvent refining during isoprene rubber production

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Such as figure 1 As shown, the solvent recovered from the condensation process enters from the top of the rectifying tower 1 from 30 theoretical plates on the top of the tower. The unreacted monomer mass concentration is 3% in this solvent, and contains 200ppm water and a small amount of heavy components. Under the joint action of the condenser 2 and the tower reboiler 6, the materials undergo sufficient heat and mass transfer in the rectification tower 1, and the light components including unreacted monomers are condensed by the tower top condenser 2 and then carried out. Total reflux, its reflux rate is 0.5 times of the feed amount, free water can be discharged regularly from the reflux tank 3, and a small amount of uncondensed gas at the top of the tower is discharged into the tail gas condenser 4. The refined and qualified solvent is extracted from the side line in the form of vapor phase in the middle of the rectification tower 1, 20 theoretical plates away from th...

Embodiment 2

[0016] Such as figure 1 As shown, the solvent recovered from the condensation process enters from the top of the rectifying tower 1 from 15 theoretical plates to the top of the tower. The unreacted monomer mass concentration in the solvent is 15%, and contains 200ppm water and a small amount of heavy components, which are condensed at the top of the tower Under the combined action of the reboiler 2 and the reboiler 6 of the tower still, the materials undergo sufficient heat and mass transfer in the rectification tower 1, and the light components including unreacted monomers are condensed by the top condenser 2 and then completely Reflux, whose reflux flow rate is 1 times of the feed amount, according to the temperature and pressure changes in the tower, the light components are continuously extracted at a small flow rate, free water can be discharged from the reflux tank 3 regularly, and a small amount of uncondensed gas at the top of the tower is discharged into the Tail gas ...

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Abstract

The invention relates to a method for solvent refining during isoprene rubber production. According to the method, the solvent recovered from a self-condensation process is conveyed into a distillation tower from the top of the tower; light components on the top of the tower are subjected to a total reflux operation through a tower top condenser and a reflux tank, or are subjected to small amount continuous recovery under the operation with a large reflux ratio more than 20, and the free water is separated from the reflux tank, and a small amount of uncondensed gases on the top of the tower are discharged to a tail gas condenser; the tower kettle liquid containing weight components is subjected to intermittent or continuous small flow rate recovery; the treated solvent is recovered from the side stream through the middle part of the tower in a vapor phase form, and is condensed by a side stream condenser, and the resulting solvent is conveyed to a polymerization process to directly use, wherein the treated solvent is the qualified solvent through the refining. According to the present invention, only a distillation tower is adopted in the method, the removal works of the water and other light components, and the heavy components are achieved in the single tower, the process is simple, the equipment investment is low, and the energy consumption is small, such that the production and operation cost can be effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of synthetic rubber production, and relates to a solvent refining method in the production of isoprene rubber. Background technique [0002] In the production process of solution polymerization synthetic rubber, such as butadiene rubber (BR), solution styrene butadiene rubber (SSBR), solution polymerization ethylene propylene rubber, isoprene rubber (IR) and styrene block copolymer SBC (SBS , SIS, SEBS) production, a large amount of solvents are used in the polymerization process, generally cyclohexane, n-hexane, etc., the glue after polymerization generally contains 80-95% solvent, and a large amount of solvent passes through the coagulation process of the glue After recovery, it is recycled in the device, so the device is equipped with a solvent recovery refining unit and related equipment. [0003] At present, almost all solvent refining adopts a double-tower process, that is, the recovered solvent first...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F36/08C08F2/04C08F2/01C08J11/02
Inventor 崔广军胡中玉于俊伟王锦昌晏小康
Owner 广东鲁众华新材料有限公司
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