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Method for refining isoprene during production of isoprene rubber

A technology of isoprene rubber and isoprene, which is applied in the field of refining monomer isoprene in the production process of isoprene rubber by solution polymerization method, can solve the problems of high production cost, large equipment investment and high energy consumption, and achieve The effect of reducing the vent flow at the top of the tower and reducing consumption

Inactive Publication Date: 2012-05-02
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 refining isoprene during production of isoprene rubber
  • Method for refining isoprene during production of isoprene rubber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Such as figure 1 As shown, the purchased isoprene has a purity of 99.5%, a TBC content of 110 ppm, a dimer content of 120 ppm, and a water content of 95 ppm. Monomer isoprene enters from the top of the rectifying tower 1 from a theoretical plate at the top of the tower, and the feed rate is 1.6 tons / hour. Under the joint action of the tower top condenser 2 and the tower still reboiler 6, the material Sufficient heat and mass transfer is carried out in the rectification tower 1. The monomer and its mixed light components and water are condensed by the top condenser 2 and then undergo total reflux. The reflux volume is 0.5 times of the feed amount. The tank 3 can regularly discharge free water, and a small amount of uncondensed gas at the top of the tower is discharged into the tail gas condenser 4; flow extraction. After being dehydrated in the stripping section, the refined and qualified monomers are extracted from the side line in the form of vapor phase in the middl...

Embodiment 2

[0015] Such as figure 1 As shown, the purchased isoprene has a purity of 99.4%, a TBC content of 95 ppm, a dimer content of 146 ppm, and a water content of 130 ppm. Monomer isoprene enters from the top of the rectifying tower 1 from 20 theoretical plates at the top of the tower, and the feed rate is 1.9 tons / hour. Under the joint action of the tower top condenser 2 and the tower still reboiler 6, the material Sufficient heat and mass transfer is carried out in the rectification tower 1. The light components in the material are condensed by the tower top condenser 2 and then undergo total reflux. The reflux flow is 0.25 times the feed amount. Light components are extracted continuously at a small flow rate, and free water can be regularly discharged 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 tower bottom liquid is extracted from the tower bottom intermittently or continuously at a small...

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Abstract

The invention discloses a method for refining a solvent during production of isoprene rubber. The method comprises the following steps of: feeding outsourcing isoprene into a rectifying tower from the tower top; performing infinite refluxing operation on tower top light components by using a tower top condenser and a reflux tank, or continuously extracting a small amount by operating on the large reflux ratio of over 20, separating free water from the refluxing tank, and exhausting a small amount of uncondensed gas on the tower top into a tail gas condenser; intermittently or continuously extracting heavy-component tower kettle liquid at a small amount from a tower kettle; and extracting refined isoprene in the form of vapor phase from a side line through the middle part of the tower, condensing with a side line condenser, and directly applying to a polymerizing procedure. The method has the advantages of small equipment and plant investments, low production energy consumption, low labor intensity and the like, and has remarkable economic and social benefits.

Description

technical field [0001] The invention belongs to the technical field of synthetic rubber production, and relates to a method for refining isoprene monomer in the production process of isoprene rubber by solution polymerization. Background technique [0002] In the process of producing isoprene rubber by solution polymerization, the purity of monomeric isoprene is required to be above 99.3%, and the water value is ≤20ppm, and about 150ppm of monomeric isoprene should be added during storage and transportation. Inhibitor TBC (p-tert-butylcatechol), before the isoprene enters the polymerization tank, the isoprene must be refined to remove harmful dimers, TBC and moisture that affect the polymerization of isoprene. Therefore, the isoprene rubber production plant is designed with a monomer refining unit and related equipment. [0003] At present, almost all monomers are refined using a double-tower process, that is, the purchased isoprene raw material first enters a dehydration t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/18C07C7/04
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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