Abstract: A method of separating a polyarylene sulfide (PAS) includes step 1: heating a PAS resin composition or a molded article thereof to a temperature of 200° C. or higher and 400° C. or lower in a polar organic solvent to dissolve the PAS and thereby obtain a PAS solution (A); step 2: separating the PAS solution (A) into a solid and a PAS solution (B) by solid-liquid separation; step 3: cooling the PAS solution (B) obtained in step 2 to a temperature of 20° C. or higher and 200° C. or lower to allow deposition of the PAS; and step 4: performing solid-liquid separation of a mixture obtained in step 3 to separate the PAS.

Abstract: A method of producing a polyarylene sulfide composed of amino groups, the method including allowing at least a dihalogenated aromatic compound, an inorganic sulfurizing agent and a compound (A) to react in an organic polar solvent and in the presence of an alkali metal hydroxide, wherein: said compound (A) is present in an amount of 0.04 moles or more and 0.5 moles or less with respect to 1 mole of said inorganic sulfurizing agent, in a reaction vessel; and said compound (A) is a compound comprising at least one aromatic ring, and having, on said one aromatic ring, an amino group, and at least one functional group selected from the group consisting of hydroxyl group, a salt of hydroxyl group, thiol group and a salt of thiol group.