Process for realizing efficient cascade depolymerization of pet by using an extremely low load organic amine catalyst

By using a bifunctional organic amine catalyst in dimethyl carbonate solvent in synergy with a nucleophilic auxiliaries, highly efficient depolymerization of PET was achieved, solving the problems of high catalyst dosage and difficulty in removing ethylene glycol byproducts, reducing costs and improving depolymerization efficiency.

CN122344136APending Publication Date: 2026-07-07UNIV OF SCI & TECH OF CHINA
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Patent Information

Application Number
CN202610826188.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-06-09
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

In existing technologies, high catalyst usage leads to high PET depolymerization costs and difficulties in separation and recovery. Ethylene glycol byproducts are also difficult to remove effectively, affecting depolymerization efficiency.

Method used

By employing a bifunctional organic amine catalyst in dimethyl carbonate solvent in synergy with a nucleophilic auxiliary agent, extremely low loading (250 ppm ~ 500 ppm) depolymerization of PET was achieved, resulting in the preparation of dimethyl terephthalate and ethylene carbonate.

Benefits of technology

Highly efficient depolymerization of PET was achieved with extremely low catalyst loading, significantly reducing catalyst usage costs and effectively capturing and converting ethylene glycol fragments, thereby improving depolymerization efficiency.

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Abstract

The application discloses a process for realizing efficient cascade depolymerization of PET by using an extremely low-load organic amine catalyst, and belongs to the field of recycling of polyester plastics. By adding an additional nucleophilic auxiliary, the catalytic performance of a binary organic amine can be greatly improved, PET depolymerization can be realized under extremely low load (250 ppm-500 ppm), dimethyl terephthalate and ethylene carbonate can be prepared, and the use cost of the catalyst is greatly reduced.
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Citation Information

Patent Citations

  • A method for upgrading polyester materials to dicarboxylic acid esters and ethylene carbonate

    CN117603043B

  • A method for catalytic depolymerization of polyethylene terephthalate (PET) to produce terephthalic acid diesters

    CN119118826B