Process for the production of high-purity, alkali metal or alkaline earth metal salts of terephthalic acid or terephthalic acid from the waste of polyterephthalic acid polyols, in particular ethylene glycol polyterephthalate

摘要

Manufacture of alkali metal or alkaline-earth metal terephthalate by reaction of an alkali metal or alkaline-earth metal hydroxide with a polyol polyterephthalate, and optional conversion of the terephthalate to terephthalic acid. …??The reaction is carried out without addition of water or in the presence of a quantity of water representing at most, by weight, the quantity of polyterephthalate. …??Application to the treatment of polyol polyterephthalate wastes.