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A kind of negative ion polymerization solvent refining process

An anion polymerization and solvent refining technology, applied in fractionation and other directions, can solve problems such as solvent CP removal and abnormal polymerization reaction, and achieve the effect of improving product quality and production stability

Active Publication Date: 2018-07-31
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at that the solvent refining process of negative ion polymerization in the prior art cannot completely remove the CP of the solvent. When using this solvent, it is easy to cause abnormal polymerization reaction during the polymerization process. The purpose of the present invention is to provide a solvent refining process for negative ion polymerization. The process can completely remove CP in the negative ion polymerization solvent, effectively prevent the influence of cyclopentadiene on the polymerization position, improve production stability and product quality, and is especially suitable for SEBS solvent refining

Method used

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  • A kind of negative ion polymerization solvent refining process
  • A kind of negative ion polymerization solvent refining process
  • A kind of negative ion polymerization solvent refining process

Examples

Experimental program
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Effect test

Embodiment 1

[0019] SEBS polymerization solvent refining:

[0020] The materials in the tower tank of the light removal tower are returned to the crude tank

[0021] When the feed rate of the dehydration tower is controlled at 20-80t / h, the pressure at the top of the T1 tower is maintained at 0-0.1MPa, the temperature at the top of the T1 tower is stable at 75-100°C, and the temperature at the bottom of the T1 tower is stable at 75-100°C. Dehydration capacity, 15-60t / h of T1 tower bottom component enters T2, T2 pressure control 0.1-0.25MPa, temperature 90-150℃, T2 tower bottom sends part of material to T3 deheavy component through liquid level adjustment, T3 pressure control 0~0.1MPa, temperature 90~120℃, in which the T3 reboiler is advanced before the condensation of the finished product produced by T2, which provides heat source for T3 deweighting and effectively saves steam consumption. After the top component of T1 is condensed, 8-20t / h enters the T4 tower to remove the light componen...

Embodiment 2

[0023] SEBS polymerization solvent refining:

[0024] The material in the tower tank of the light removal tower is returned to the heavy removal tower II

[0025] When the feed of T1 tower is controlled at 20-60t / h, the pressure at the top of T1 tower is maintained at 0-0.1MPa, the temperature at the top of T1 tower is stable at 75-92°C, and the temperature at the bottom of T1 tower is stable at 78-98°C. 15-45t / h of the bottom component of T1 enters T2, the pressure of T2 is controlled at 0.15-0.25MPa, the temperature is 90-140°C, part of the material is sent to the deheavy component of T3 through liquid level adjustment at the bottom of T2, and the pressure of T3 Control 0~0.01MPa, temperature 90~120℃, among them, the T3 reboiler is advanced before the condensation of the finished product extracted from T2, which provides heat source for T3 deweighting and effectively saves steam consumption. After the top component of T1 is condensed, 0~20t / h enters the T4 tower to remove t...

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Abstract

The invention discloses an anion polymerization solvent refining process. The process utilizes that the dimer generated by cyclopentadiene through its own polymerization can be used as a heavy component to be removed after weight removal, and the anion polymerization solvent refining process is designed as dehydration and weight removal. And light removal process, the cyclopentadiene in the refined solvent obtained by this process has very little residue in the solvent, which effectively avoids the influence of cyclopentadiene on the polymerization position when the refined solvent is used, and improves the production stability and product quality.

Description

technical field [0001] The invention relates to an anion polymerization solvent refining process, which belongs to the technical field of anion polymerization production. Background technique [0002] The main production mode of existing styrene-based thermoplastic elastomers (such as SBS, SIS, SEBS, SEPS) produced by active anion polymerization is still batch solution polymerization mode. The solvent recovery process is a water analysis coagulation process, and the crude solvent recovered by coagulation is refined by the tower system and then put into the polymerization post for use, thus completing the solvent recycling. The biggest feature of the negative ion polymerization production process is that the production process has strict requirements on the purity of the system. The presence of very small impurities can lead to abnormal reactions, production fluctuations and even device collapse. Therefore, for the negative ion polymerization production process that uses a la...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D3/14
Inventor 康铮文军黄军颢文强杨虎龙蔡保成唐继斌
Owner CHINA PETROLEUM & CHEM CORP