PROCEDE POUR LA PRODUCTION DE TEREPHTALATE D'UN METAL ALCALIN PURIFIE, ISSU DE PRODUITS DE SAPONIFICATION DE POLYTEREPHTALATES D'ALKYLENE DE RECUPERATION

摘要

The invention concerns a method for producing terephthalate of alkaline metal and alkylene glycol from recuperated alkylene polyterephthalate. It comprises saponification of said alkylene terephthalates with an aqueous sodium solution, adding a sufficient volume of water to ensure solubilization of the entire alkaline metal terephthalate produced in the reaction medium liquid phase and crystallisation of the sodium terephthalate by concentration of said liquid phase. The resulting sodium terephthalate can be directly used for producing pure terephthalic acid usable for the renewed production of alkylene polyterephthalates to be used in the food industry.