Washing arylene sulfide polymers with water plus a reducing agen

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Treating polymer containing material or treating a solid...

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528388, 528480, 528481, 528487, 528488, 528490, 528492, C08G 7516

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active

048824186

ABSTRACT:
A process is provided for removing solid and liquid impurities from a particulate arylene sulfide polymer recovered from a polymerization reaction mixture slurry, without significantly discoloring the resulting washed polymer. The process of this invention comprises the steps of: (a) preparing a first slurry, wherein the solid component thereof comprises a particulate arylene sulfide polymer recovered from a reaction mixture slurry, and wherein the liquid component thereof comprises a mixture of water and a reducing agent; (b) heating the first slurry to a temperature of at least about 185.degree. C. (365.degree. F.) but below the melting point of the particulate polymer, to wash the polymer contained therein; (c) cooling the first slurry to a temperature below about 100.degree. C. (212.degree. F.), to form a second slurry, wherein the solid component thereof comprises a washed particulate arylene sulfide polymer; and (d) recovering the washed particulate arylene sulfide polymer from the second slurry.

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N. Nordell, Water Treatment for Industrial and Other Uses, 104 and 262 (1961).
Betz Handbook of Industrial Water Conditioning, 86 and 88 (7th ed., 1976).
G. Nickless, Inorganic Sulfur Chemistry, 519 and 521 (1968).

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