METHOD FOR FORMING AN AROMATIC DIACID AND/OR AN AROMATIC DIACID PRECURSOR FROM A POLYESTER-CONTAINING FEEDSTOCK

• Main Authors: LEONARDI, DANIEL, SCHMIDT, GREGORY, BITSCH-LARSEN, ANDERS, BARTOS, THOMAS, METELSKI, PETER, JOSHI, AJAY
• Format: Patent
• Language: English; French
• Published: 12.07.2022
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; GENERAL PROCESSES OF COMPOUNDING; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC CHEMISTRY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; WORKING-UP

A method for forming an aromatic diacid and/or an aromatic diacid precursor from a polyester-containing feedstock. The method comprises contacting the polyester-containing feedstock with water or an alcohol to depolymerize the polyester and thereby form an aromatic diacid and/or an aromatic diacid precursor, wherein the polyester-containing feedstock comprises about 80 wt% or more polyester and about 1 wt% or more of at least one secondary material, and wherein the at least one secondary material is not polyester. Cette invention concerne un procédé de formation d'un diacide aromatique et/ou d'un précurseur de diacide aromatique à partir d'une charge contenant du polyester. Le procédé selon l'invention comprend la mise en contact d'une charge contenant du polyester avec de l'eau ou avec un alcool pour dépolymériser le polyester et former ainsi un diacide aromatique et/ou un précurseur de diacide aromatique, la charge contenant du polyester comprenant environ 80 % en poids ou plus de polyester et environ 1 % en poids ou plus d'au moins un matériau secondaire, ledit matériau secondaire n'étant pas du polyester.