Abrégé

Disclosed is a method for comprehensive recycling of a by-product slurry during polyphenylene sulfide (PPS) production. Na2CO3 is added to the slurry, and then a solvent NMP is recovered by distillation and drying, then an acid solution is used for dissolving and leaching the resulting dry waste salt, the leaching liquor is subjected to pH adjustment and then filtered, with the insoluble components being removed, the liquid phase is subjected to adsorption and purification and evaporation concentration to separate out NaCl, then Na2CO3 is added to the solution with NaCl separated out for precipitation to obtain Li2CO3, the mother liquor with lithium precipitated is subjected to pH adjustment and then mixed with the solution obtained after adsorption and purification, and a closed circulation of the process is achieved. The method can be used in the comprehensive recycling of the by-product slurry during PPS production, the recovered NaCl can be directly used for caustic soda preparation by ionic membrane electrolysis, and Li2CO3 can directly serve as an industrial product or can be further converted into LiCl to serve as a PPS production auxiliary for recycling.

Classes IPC  ?

• C08G 75/0277 - Traitement de post-polymérisation
• C08G 75/0281 - Récupération ou purification
• C08G 75/0254 - Procédés de préparation utilisant des sulfures métalliques
• C08G 75/0213 - Polyarylène-thioéthers dérivés de monomères contenant un noyau aromatique contenant des éléments autres que le carbone, l’hydrogène ou le soufre
• C01D 15/08 - CarbonatesBicarbonates
• C01D 3/14 - Purification
• C07D 207/267 - Pyrrolidones-2 avec uniquement des atomes d'hydrogène ou des radicaux ne contenant que des atomes d'hydrogène et de carbone, liés directement aux autres atomes de carbone du cycle avec uniquement des atomes d'hydrogène ou des radicaux ne contenant que des atomes d'hydrogène et de carbone, liés directement à l'atome d'azote du cycle