A nanoscale enzyme catalyst and a process for its use in the hydrothermal degradation of polycaprolactam

By using nanozyme catalysts that combine specific metals with terephthalic acid ligands, the problem of low efficiency in the hydrothermal degradation of polycaprolactam has been solved, achieving efficient, green, and low-energy recovery of polycaprolactam, and the catalyst can be recycled.

CN121623771BActive Publication Date: 2026-05-29YUANTIAN BIOTECHNOLOGY (TIANJIN) CO LTD
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Patent Information

Application Number
CN202610139638.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2026-02-02
Publication Date
2026-05-29
Estimated Expiration
2046-02-02

AI Technical Summary

Technical Problem

Existing hydrothermal methods for degrading polycaprolactam are inefficient. Traditional catalysts require harsh reaction conditions under high temperature and pressure, resulting in high energy consumption and low monomer yield, making it difficult to achieve efficient and green recycling.

Method used

By combining specific types of single-metal or bimetallic nanozyme catalysts with terephthalic acid ligands, oxygen vacancies are formed through hydrothermal reaction and calcination. The electronic structure of the metal is controlled to improve catalytic efficiency and degrade polycaprolactam into caprolactam monomer.

Benefits of technology

Complete degradation of polycaprolactam is achieved at a lower temperature with a conversion rate of 100% and a caprolactam yield that is stable at over 94%. This reduces energy consumption and complies with green chemistry principles. The catalyst is also recyclable.

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Abstract

The present application relates to the technical field of polymer material chemical recycling, and in particular to a kind of nano-enzyme catalyst and process for its use in hydrothermal method degradation polycaprolactam.The nano-enzyme catalyst provided by the present application uses specific single metal or double metal combination as metal center, and is combined with specific organic ligand, can be efficiently and deeply degraded PA6 at relatively low temperature, and the catalyst can also be recycled, completely realizing the green recycling of PA6.The nano-enzyme catalyst provided by the present application can make the conversion rate of PA6 molecule reach 100% using hydrothermal method, and the caprolactam yield can be stably above 94%, avoiding the use of organic solvent with high toxicity, and realizing the whole green recycling from " waste containing PA6" to " renewable caprolactam monomer".
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