Patent ID: 9567437
Date: 2017-02-14
CPC Classifications: C08G

Claim:
1. A production method of a cyclic polyarylene sulfide by heating and reacting a raw material mixture (a) including at least a sulfidizing agent, a dihalogenated aromatic compound and an organic polar solvent, the production method continually performing each of an operation (A) of supplying the raw material mixture (a) to a reaction mixture (b) in a reaction vessel which includes a reaction product obtained from the raw material mixture (a), an operation (B) of withdrawing part of the reaction mixture (b) from the reaction vessel, and an operation (C) of heating the reaction vessel, wherein a volume of the organic polar solvent including in the reaction mixture (b) is not less than 1.25 liters and not greater than 50 liters per 1 mol of sulfur content in the reaction mixture (b), and wherein a concentration of unreacted sulfidizing agent and a concentration of unreacted dihalogenated aromatic compound included in the reaction mixture (b) in the reaction vessel are respectively maintained to be not higher than 30% of a concentration of the sulfidizing agent and a concentration of the dihalogenated aromatic compound included in the raw material mixture (a).