公开(公告)号：GB2537264B

公开(公告)日：2021-01-20

申请号：GB201607798

申请日：2014-08-01

Applicant: IBM

Inventor： ROBERT DAVID ALLEN ,  KRISHNA MOHAN BAJJURI ,  GREGORY BREYTA ,  JAMES LUPTON HEDRICK ,  CARL ERIC LARSON

IPC: C08J11/28 ,  C07C51/09

Abstract: Provided is a method of depolymerizing polyesters from post-consumer products, such as beverage bottles, to produce a high purity reaction product. For the depolymerization reaction, the polyesters are reacted with an alcohol and an amine organocatalyst at a temperature of about 150° C. to about 250° C. In one application, the use of an organocatalyst with a boiling point significantly lower than the boiling point of the reactant alcohol allows for the ready recycling of the amine organocatalyst. In another application, performing the depolymerization reaction under pressure at a temperature above the boiling point of the alcohol allows for accelerated depolymerization rates and the recovery of the organocatalyst with no further heat input. In a further application, glycolytic depolymerization of poly(ethylene terephthalate) (PET) produces a reaction product of bis(2-hydroxyethyl)terephthalate (BHET), which may in turn be used to produce high purity beverage bottle grade PET, in a closed loop process with minimal waste.

公开(公告)号：GB2537264A

公开(公告)日：2016-10-12

申请号：GB201607798

申请日：2014-08-01

Applicant: IBM

Inventor： ROBERT DAVID ALLEN ,  KRISHNA MOHAN BAJJURI ,  GREGORY BREYTA ,  JAMES LUPTON HEDRICK ,  CARL ERIC LARSON

IPC: C08J11/28 ,  C07C51/09

Abstract: Provided is a method of depolymerizing polyesters from post-consumer products, such as beverage bottles, to produce a high purity reaction product. For the depolymerization reaction, the polyesters are reacted with an alcohol having 2 to 5 carbons and an amine organocatalyst at a temperature of about 150 degrees C to about 250 degrees C. In one application, the use an organocatalyst with a boiling point significantly lower than the boiling point of the reactant alcohol allows for the ready recycling of the amine organocatalyst. In another application, performing the depolymerization reaction under pressure at a temperature above that of the alcohol allows for accelerated depolymerization rates and the recovery of the organocatalyst with no further heat input. In a further application, glycolytic depolymerization of poly(ethylene terephthalate) (PET) from post-consumer beverage bottles produces a pure reaction product of bis(2-hydroxyethyl)terephthalate (BHET), which may in turn be used to produce high purity beverage bottle grade PET, in a closed loop process with minimal output and waste.