Treatment method of polyphenylene sulfide polymerization failure slurry

Abstract

The invention relates to a treatment method of polyphenylene sulfide polymerization failure slurry, which comprises the following steps: diluting, filtering, rectifying and dehydrating, and carrying out secondary evaporation and rectification to obtain N-methyl pyrrolidone capable of carrying out polyphenylene sulfide polymerization reaction again. Substances such as polyphenylene sulfide oligomer, p-dichlorobenzene and thiophenol remaining in the failure process are removed from the recovered N-methyl pyrrolidone, once the substances which can influence the successful polymerization reaction are removed, the recovered N-methyl pyrrolidone can be subjected to secondary production line polymerization reaction, the retention of waste materials is reduced, and the production cost is reduced. The utilization rate of chemical raw materials is increased, and the possibility that the surrounding environment is possibly damaged is reduced.

Description

technical field [0001] The invention relates to the technical field of polymer resin synthesis, in particular to the technical field of slurry treatment of polyphenylene sulfide polymerization failure. 【Background technique】 [0002] Polyphenylene sulfide is an excellent engineering resin with excellent heat resistance and chemical resistance, and has attracted attention as a component of electrical and electronic equipment. In addition, it can be molded into various molded parts, films, sheets, fibers, etc. by injection molding, extrusion, and is widely used in fields requiring heat resistance and chemical resistance. [0003] The preparation method of polyphenylene sulfide is generally carried out by heating hydrated alkali metal sulfide in a polar organic solvent to remove the water contained in the hydrate of alkali metal sulfide, and adding dihalobenzene to it for thermal polymerization. . During the polymerization of polyphenylene sulfide, due to changes in the react...

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problem that the polyphenylene sulfide polymerization failure slurry is difficult to treat, or even impossible to recycle, the present invention proposes a treatment method, which can effectively recover the failed slurry after removing harmful substances in the failed slurry by watering, filtering, rectifying and other processes The N-methylpyrrolidone (NMP) solvent in the solvent can realize the recovery of the NMP solvent that meets the standard for secondary polymerization, solves the problem that this type of reaction solution cannot be processed and piled up, reduces environmental pollution, improves the stability of the production device, and reduces labor costs. Productivity and device capacity, reduce loss, improve economic benefits