Patent ID: 6239310
Filing Date: 2001-05-29
Classification: C07C

Abstract:
The method of recovery of terephtalic acid and ethylene glycol from poly/ethylene terephtalate/ wastes, in which the suitably disintegrated wastes of poly/ethylene terephtalate/ are subjected to the treatment of an aqueous, slightly alkaline solution at the increased temperature, and then the reaction mixture, after separation solid impurities and chilling, is neutralised with acid and from the resulted mixture a solid phase is separated, which is subjected to the purification and drying, and from the remained solution ethylene glycol is separated, characterised in, that poly/ethylene terephtalate/ is heated in an aqueous solution at the temperatures from 150.degree. C. to 280.degree. C. with a reagent substance, chosen from the group, comprising bicarbonates of ammonia and alkali metals, ammonium carbamate and urea, which substances are used in amounts not less than a stechiometric amount.