Method for producing aromatic bis(hydroxyalkyl) dicarboxylate and method for producing recycled aromatic polyester

• Main Authors: TSURUDA, RYO, SUNOUCHI, SATOSHI
• Format: Patent
• Language: Chinese; English
• Published: 16.01.2024
• 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

Provided is a method for producing an aromatic bis(hydroxyalkyl) dicarboxylate by depolymerizing a polyester in the presence of a catalyst. This method for producing an aromatic bis(hydroxyalkyl) dicarboxylate by depolymerizing a polyester in the presence of a catalyst is characterized in that the catalyst is a manganese-based catalyst and the used amount of the catalyst with respect to the polyester is 20-500 mmol%. Also provided is a method for producing a polyester polymer and an intermediate thereof, wherein the polyester polymer is produced by performing re-polymerization using the aromatic bis(hydroxyalkyl) dicarboxylate as a raw material, and the polyester polymer has less coloration like a virgin product (product which is produced by polymerizing monomers without performing depolymerization).