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Method of removing solvent from polymer solution and solventremoving apparatus

A polymer solution and desolventization technology, applied in separation methods, chemical instruments and methods, evaporation, etc., can solve problems such as difficult desolventization

Inactive Publication Date: 2005-09-07
JSR CORPORATIOON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, in the steam stripping method in which steam is supplied from the bottom etc. to one desolventization tank, the system tends to be in an equilibrium state, and desolventization cannot be efficiently performed.
In addition, in the method of desolvating by contacting the polymer solution with steam using a gas-liquid mixer or the like, it is also difficult to efficiently desolventize

Method used

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  • Method of removing solvent from polymer solution and solventremoving apparatus
  • Method of removing solvent from polymer solution and solventremoving apparatus
  • Method of removing solvent from polymer solution and solventremoving apparatus

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1( Embodiment 1～4 and comparative example 1～2

[0148] Use the mixed solvent that 90 mass % hexanaphthene and 10 mass % n-heptane forms as reaction solvent, use the device shown in Figure 1 to carry out desolvation to polymer solution (temperature 60 ℃), this polymer solution contains 20 mass % A styrene-butadiene copolymer (styrene content: 10% by mass) obtained by copolymerizing styrene and butadiene using n-butyllithium as a polymerization initiator. That is, while stirring the polymer tank 4 (made of stainless steel, with an internal volume of 3 m 3 ) in the styrene-butadiene copolymer solution is sent out by the pump 5 (plunger pump), transferred through the polymer solution transfer pipe 2, and supplied to the built-in polymer solution at a speed of 130 liters / hour. In the in-line mixer 21 as a gas-liquid mixer in the pipe 2 for solution transfer. Simultaneously, steam [pressure (gauge pressure) 1.2 MPa, temperature 220° C. (the pressure and temperature of steam are the same below)] was supplied from the steam source...

experiment example 2( Embodiment 5～6 and comparative example 3～4

[0152] When the solvent contained in the polymer solution is expressed as 100 parts by mass, the total amount of steam supplied to the gas-liquid mixer and the amount of steam supplied to the desolventizing tank is 150 parts by mass, and is changed as shown in Table 1. Except for the respective supply amounts, solvent removal was performed in the same manner as in Example 1.

experiment example 3( Embodiment 7～9 and comparative example 5～6

[0154] A mixed solvent composed of 90% by mass cyclohexane and 10% by mass of n-heptane was used as a reaction solvent, and a polymer solution (temperature 60°C) containing 15% by mass of n-butyllithium as a polymerization initiator was used. Styrene-butadiene rubber (styrene content: 35% by mass) obtained by copolymerization of styrene and butadiene was supplied to a gas-liquid mixer when the solvent contained in the polymer solution was calculated as 100 parts by mass. Desolvation was performed in the same manner as in Example 1, except that the total amount of steam in and the amount of steam supplied to the desolventization tank was 70 parts by mass, and the respective supply amounts were changed as shown in Table 1.

[0155] In addition, in these Experimental Examples 1 to 3, the residual solvent concentration of the polymer after desolventization refers to the solvent concentration in the dry polymer, which was obtained by a gas chromatograph (apparatus equipped with an F...

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Abstract

The invention relates to a method for removing solvent from polymer solution generated by solution polymerization and an apparatus for removing solvent from such polymer solution. The method for removing solvent from polymer solution in accordance with the invention is a method for removing solvent by putting polymer solution and steam in contact with each other to remove the solvent by steam stripping, including a step of feeding a part of the steam into tube 2 for transferring polymer solution to tank 1 for removing solvent, and a step of feeding the remaining part of the steam into the inside of the tank for removing solvent. Particularly, the amount of the steam to be fed into the tube is preferably at 10 to 90 % by mass, when the whole amount of the steam is defined as 100 % by mass. The polymer contained in the polymer solution includes various polymers such as butadiene rubber, styrene - butadiene rubber, and ethylene - alpha -olefin - non-conjugated diene copolymer rubber. Further, the solvent is preferably n-hexane, n-pentane, cyclohexane, toluene and the like.

Description

technical field [0001] The invention relates to a solvent removal method and a solvent removal device for a polymer solution. More specifically, the present invention relates to a desolvation method for efficiently removing a solvent from a polymer solution produced by solution polymerization and a desolvation apparatus used therein. Background technique [0002] The polymer contained in the polymer solution produced by solution polymerization is usually recovered by washing the polymer solution with water, decomposing and removing catalyst residues, etc., and performing a devolatilization treatment to remove the solvent and unreacted monomer from the polymer solution. , or a small amount of remaining water and other volatile components are removed. In addition, in the devolatilization treatment, conventionally, steam stripping is used for desolventization, and this steam stripping is usually performed by supplying steam from the bottom to a desolventizing tank, and bringin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08C2/06C08F6/10C08F6/12
CPCB01J2219/00006B01D3/38B01D1/14C08F6/12C08C2/06C08F6/10
Inventor 山口智大内村和美和田刚史熊井现二
Owner JSR CORPORATIOON
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