Recovery and using method of solution and unreaction monomer in process of producting polymer by solution polymerization process

A technological process and polymerization technology, applied in the field of polymer production, can solve the problems of high production cost, large investment in equipment, high energy consumption, etc.

Active Publication Date: 2009-01-21
FUSHUN YIKESI NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In a word, the above-mentioned traditional method adopts more than two distillation towers, the process flow is complicated, the equipment investment is large, the energy consumption is high, and thus the production cost is also high

Method used

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  • Recovery and using method of solution and unreaction monomer in process of producting polymer by solution polymerization process
  • Recovery and using method of solution and unreaction monomer in process of producting polymer by solution polymerization process

Examples

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Embodiment 1

[0025] Embodiment 1. A method for recycling solvents and unreacted monomers in the process of producing isoprene rubber by solution polymerization. This embodiment includes supplementary distillation and refining of fresh monomer (dehydration, removal of light components and removal of heavy components) and separation and distillation of the condensed oil phase (dehydration of solvent and unreacted monomers, removal of light components and removal of heavy components) ).

[0026] Such as figure 1 As shown, the condensed oil phase 16 (unreacted monomer mass concentration 11%, and containing 450ppm water and a small amount of heavy components) that reclaims from the coagulation process enters the recovery refining tower 21 (nominal diameter is 70 millimeters, The middle part B (25 theoretical plates from the top of the tower) is equipped with 4×6 metal rolling ring random packing). Supplementary fresh monomer 19 enters from the upper part A of the rectification section (10 th...

Embodiment 2

[0030] Example 2, a method for recycling solvents and unreacted monomers in the process of producing isoprene rubber by solution polymerization is as in Example 1. The condensed oil phase 16 that reclaims from coagulation operation 9 is 20 liters / hour (unreacted monomer concentration 1.5%, and contains 440ppm water and a small amount of heavy component) and enters the middle part B of recovery tower 21 (10 theoretical plates away from the tower top), Supplementary 0.5 liter / hour fresh monomer 19 enters 21 from the upper part A of the rectifying section (5 theoretical plates from the top of the tower). The tower top monomer undergoes total reflux through the tower top condenser 2, and its reflux flow is 0.2 times of the feed amount, and free water 5 can be separated from the reflux tank 3 regularly. Solvents and monomers pass through the dehydration section of the stripping section at C (15 theoretical plates away from the tower kettle) in the form of vapor phase side line extr...

Embodiment 3

[0032]Embodiment 3, a method for recycling solvents and unreacted monomers in the process of producing polymer isoprene rubber by solution polymerization is as in Embodiment 1. The condensed oil phase 16 that reclaims from condensing operation 9 is 20 liters / hour (30% of unreacted monomer concentration, and contains 460ppm water and a small amount of heavy component) and enters the middle part B of recovery tower 21 (from tower top 40 theoretical plates), Supplementary fresh monomer 19 of 6.8 liters / hour enters 21 from the upper part A of the rectification section (15 theoretical plates from the top of the column). The tower top monomer undergoes total reflux through the tower top condenser 2, and its reflux flow is three times that of the feed amount, and free water 5 can be separated from the reflux tank 3 regularly. Solvents and monomers pass through the dehydration section of the stripping section at C (5 theoretical plates away from the tower kettle) in the form of vapor ...

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Abstract

This invention relates to reutilization method of solvent and not reaction monomer in process of producing polymer by solution polymerization method. Cohesion oil phase input stuff at middle of refining recovery tower that 10 to 40 pieces theoretical plate number distance from tower top; supplement of greenness monomer input stuff at refining tower that 5 to 15 pieces theoretical plate number distance from tower top; the monomer distilled off from tower top takes regurgitation by infinite reflux or large reflux ratio, and abstract free water from return tank; the inert constituents which enrich in monomer and most is mono-alkenes recovered from tower top; solvent and monomer transit dehydration zone of reclaim refining tower stripping section, siding recovered by vapor phase at 5 to 15 pieces theoretical plate number distance from top, by freezing and adsorption refining, then for directly use after polymerization process; Tower bottoms that enrich heavy constituents recovered from tower pot. It just adopts a dephlegmator for produce, be able to extensively used in solution polymerization of different kinds of polymer, especially isoprene rubber and CPBR.

Description

technical field [0001] The invention belongs to the technical field of polymer production and relates to the improvement of a method for recycling solvents and unreacted monomers in the process of producing polymers by solution polymerization. Background technique [0002] In the process of producing polymers by solution polymerization, about 5-30% of unreacted monomers and 100% of solvents need to be recovered and recycled according to different polymerization conversion rates. In the prior art, most of them are separated by several distillation towers, and then recycled after dehydration, light removal and weight removal (∏.A. Kilpinikov, etc., translated by the editorial department of "Synthetic Rubber Industry", Industrial Major Production Processes and Processes, 1978). Four distillation towers are used for the production of isoprene rubber in Russia, and two distillation towers are used for the production of isoprene rubber by Snam Company in Italy [Bruzzone, M., etc....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J11/02C08F6/10
Inventor 虞旻韩方煜
Owner FUSHUN YIKESI NEW MATERIAL
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