| 主权项 |
1. A production method of a cyclic polyarylene sulfide by a reaction of a reaction mixture under heating, wherein the reaction mixture includes at least a sulfidizing agent (a), a dihalogenated aromatic compound (b) and an organic polar solvent (c), the reaction mixture having the organic polar solvent (c) of not less than 1.25 liters and not more than 50 liters relative to 1 mol of sulfur content in the reaction mixture, the production method comprising:
a process 1 of heating the reaction mixture having an arylene unit of not less than 0.80 mol but less than 1.05 mol per 1 mol of the sulfur content in the reaction mixture and thereby causing the reaction to proceed until 50% or more of the sulfidizing agent (a) in the reaction mixture is consumed for the reaction; subsequent to the process 1, a process 2 of further causing the reaction to proceed under heating after addition of the dihalogenated aromatic compound (b) to have the arylene unit of not less than 1.05 mol and not greater than 1.50 mol per 1 mol of the sulfur content in the reaction mixture, so as to obtain a reaction product including at least a cyclic polyarylene sulfide and a linear polyarylene sulfide; and subsequent to the process 2, a process 3 of performing solid-liquid separation of the reaction product in a temperature range of not higher than a boiling point of the organic polar solvent (c) under ordinary pressure, so as to obtain a filtrate including the cyclic polyarylene sulfide and the organic solar solvent (c). |
