Preparation method and application of nitrogen / phosphorus-doped metalloporphyrinyl covalent organic framework derivative

By using nitrogen/phosphorus-doped metal porphyrin-based covalent organic framework derivative catalysts, the problem of low PET alcoholysis conversion rate was solved, efficient and environmentally friendly PET alcoholysis was achieved, and costs were reduced.

CN120737291APending Publication Date: 2025-10-03QUANZHOU YONGYUE NEW MATERIAL CO LTD
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Patent Information

Application Number
CN202511121107.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-08-12
Publication Date
2025-10-03

AI Technical Summary

Technical Problem

The conversion rate of existing PET alcoholysis catalysts in depolymerizing PET with ethylene glycol is difficult to reach 80%, and traditional catalysts have problems of environmental pollution and high cost.

Method used

Nitrogen/phosphorus-doped metal porphyrin-based covalent organic framework derivatives are used as catalysts, which are prepared by calcination, nitridation and phosphation treatment to form COFs derivatives with high specific surface area and porous structure, which are used for the alcoholysis reaction of PET.

Benefits of technology

The alcoholysis conversion rate of PET was improved to 89.7%-92.1%, which reduced costs and reduced environmental burden, in line with the concept of green chemistry.

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Abstract

The invention relates to the technical field of PET alcoholysis catalysts, in particular to a preparation method of a nitrogen / phosphorus-doped metalloporphyrin covalent organic framework derivative. The preparation method comprises the following steps: reacting 5, 10, 15, 20-tetra (4-aminophenyl) porphyrin with anhydrous metal chloride to prepare 5, 10, 15, 20-tetra (4-aminophenyl) porphyrin metal; porphyrin metal and phthalaldehyde are subjected to a Schiff base reaction; n / P elements are effectively introduced into the covalent organic framework derivative through calcination nitridation and phosphorization respectively, and the nitrogen / phosphorus-doped metalloporphyrin covalent organic framework derivative is prepared. The high specific surface area and the ordered porous structure of the COFs derivative provide a sufficient contact area and a rapid diffusion channel for reactant molecules, multiple active sites are introduced through nitrogen / phosphorus doping, the acid-base property of the material is regulated and controlled, and the adsorption and activation capacity of the catalyst on PET molecules and alcoholysis intermediates is optimized, so that the alcoholysis efficiency is improved.
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Citation Information

Patent Citations

  • Preparation method of alcoholysis catalyst

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