Process for treating a polymer slurry

Details Process for treating a polymer slurry Process for treating a polymer slurry

C - Chemistry, Metallurgy

08

G

402/344

C08G 75/02 (2006.01)

Patent

CA 1251888

ABSTRACT OF THE DISCLOSURE A process for treating a polyarylene sulfide polymer slurry which has been provided by reactions of an alkali sulfide and a dichloroaromatic compound in N- methylpyrrolidone, the process comprising the following steps of (i) through (iv): (i) a step of separating a polymer slurry which contains polyarylene sulfide particles, alkali chloride as a by-product in the form of crystals and a solution and an arylene sulfide oligomer and has a liquid component which is principally N- methylpyrrolidone into polyarylene sulfide particles and a slurry containing the crystalline alkali chloride, the oligomer, and unreacted organic material by screening the slurry without diluting with water; (ii) a step of subjecting the slurry containing the crystalline alkali chloride to solid-liquid separation to obtain the crystalline alkali chloride; (iii) a step of washing the polyarylene sulfide particles with an organic solvent and water; and (iv) a step of recovering the organic solvent from a filtrate obtained by solid-liquid separation.

508541

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