Removal of reaction diluent from poly(arylene sulfide) reaction

Details Removal of reaction diluent from poly(arylene sulfide) reaction Removal of reaction diluent from poly(arylene sulfide) reaction

1974-05-03

1976-05-11

Yudkoff, Norman

Concentrating evaporators

Processes

Involving waste liquid

159 2MS, 159 16S, 203 88, 203 96, 260 79, B01D 100

Patent

active

039560600

ABSTRACT:
A method for the removal of substantially all of the reaction diluent from a reaction mixture containing poly(arylene sulfide) polymer, organic polar diluent, by-product alkali metal halide, and other impurities is provided by the atmospheric adiabatic expansion of the polymer slurry from about 200 pounds pressure in a transfer line to atmospheric pressure in a flash tank, the polymer being mixed at the point of pressure letdown with 200 psig steam which is reduced in pressure at the same point in the transfer line, to remove 75 to 98 percent of the reaction diluent from the flash tank as vapor. The polymer-salt-residual diluent mixture is then passed through heated blending and drying equipment into which superheated steam is flashed to remove the residual diluent. The residual polar diluent passes back through the equipment with the steam to be removed from the flash tank.

REFERENCES:
patent: 3409515 (1968-11-01), Baird
patent: 3478000 (1969-11-01), Saunders
patent: 3707528 (1972-12-01), Miles
patent: 3799234 (1974-03-01), Skidmore

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