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AssigneePhillips Petroleum Company
InventorsLacey E. Scoggins, Bradley L. Munro
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A method for recovering granular poly(arylene sulfide) from a polymerization reaction mixture at a temperature above that at which poly(arylene sulfide) is in molten phase comprising polar organic solvent and poly(arylene sulfide) in which, in the presence of a sufficient amount of separation agent to cause a phase separation of molten poly(arylene sulfide) and polar organic solvent, the temperature of the polymerization reaction mixture is reduced sufficiently to solidify the poly(arylene sulfide) to produce a slurry comprising particulate poly(arylene sulfide) in polar organic solvent. In a preferred embodiment a slurry comprising particulate poly(phenylene sulfide) in N-methyl-2-pyrrolidone is produced using water, and optionally an alkali metal carboxylate, as separation agent.
A method for recovery of granular poly(arylene sulfide) from a polymerization reaction mixture comprising polar organic solvent, poly(arylene sulfide) and alkali metal halide by-product said reaction mixture at a temperature above that at which poly(arylene sulfide) is in molten phase said method comprising, in the presence of a sufficient amount of a separation agent that is soluble in said polar organic solvent and is not a solvent for poly(arylene sulfide) to cause a phase separation of said molten poly(arylene sulfide) from said polar organic solvent, reducing the temperature of said polymerization reaction mixture sufficiently to produce from said polymerization reaction mixture a slurry comprising particulate poly(arylene sulfide) in polar organic solvent.
A method for recovery of granular poly(arylene sulfide) from a polymerization reaction mixture comprising polar organic solvent, poly(arylene sulfide) and alkali metal halide by-product said reaction mixture at a temperature above that at which poly(arylene sulfide) is in molten phase said method comprising:
Dependencies are inferred from the claim text.