PROCESS FOR PRODUCING POLYARYLENE SULFIDE

• Main Authors: SUZUKI KENJI, SAKABE HIROSHI, MIYAHARA MICHIHISA
• Format: Patent
• Language: English; Japanese
• Published: 26.07.2018
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

PROBLEM TO BE SOLVED: To provide a process for producing polyarylene sulfide (hereinafter referred to as PAS) in which, from a solid containing an alkali metal halide produced as a by-product and an unreacted sulfur source, the solid in which the amount of the sulfur source is reduced and the sulfur source can be recovered without imposing a large scale process.SOLUTION: A process for producing PAS according to the present invention includes a polymerization step of producing PAS, an extraction step of bringing an extraction solvent into contact with the solid produced in the polymerization step and extracting at least a part of the sulfur source from the solid, and a recovery step of separating and recovering the solid underwent the extraction step and an extract produced in the extraction step, and in which the extraction solvent is (1) a protic organic solvent, or (2) a mixed solvent containing water and an organic solvent, and the amount of the sulfur source in the solid recovered in the recovery step is 2 pts.mass or less per 100 pts.mass of the alkali metal halide.SELECTED DRAWING: Figure 2 【課題】大掛かりなプロセスを施すことなく、副生成物として生成されるアルカリ金属ハロゲン化物と未反応の硫黄源とを含有する固形物から、上記硫黄源の量が低減した前記固形物と、上記硫黄源とを回収できる、ポリアリーレンスルフィド（以下、ＰＡＳ）の製造方法を提供する。【解決手段】本発明に係るＰＡＳの製造方法は、ＰＡＳを生成させる重合工程と、重合工程で生成した固形物に抽出溶媒を接触させ、該固形物から硫黄源の少なくとも一部を抽出する抽出工程と、抽出工程を経た該固形物と抽出工程で生成した抽出液とを分離回収する回収工程と、を含み、該抽出溶媒は、（１）プロトン性有機溶媒、又は、（２）水と有機溶媒とを含有する混合溶媒、であり、該回収工程で回収される該固形物中の該硫黄源の量は、該アルカリ金属ハロゲン化物１００質量部に対し２質量部以下である。【選択図】図２