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US 4,734,484 AGranted
Process for the isolation of polyarylene sulphide from salts contained therein
AssigneeBayer Aktiengesellschaft
InventorsFranz Alfes, Wolfgang Alewelt, Wolfgang Eisermann, Erhard Tresper
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Abstract
The invention relates to a process for the isolation of polyarylene sulphides, polyarylene sulphides with particularly low electrolyte content being obtained.
Claims1
An improved method for separating inorganic salts from a crude polyarylene sulfide reaction product which contains inorganic salts, polyarylene sulfide and an organic solvent to obtain a substantially salt-free polyarylene sulfide comprises:
- (a) passing the crude polyarylene sulfide reaction product through a heated decanter centrifuge to obtain a solid salt and a clarified liquid,
- (b) then passing the clarified liquid from step (a) through a heated pressure filter at a temperature greater than 180.degree. C. wherein the filter comprises wire sieves or sinter plates heaving an adjustable pore size ranging from 10 to 200 .mu.m to obtain a solution of polyarylene sulfide substantially salt-free.
Dependencies are inferred from the claim text.