Preparation method and application of zinc gallate catalyst for synthesizing carbon dioxide-based polycarbonate

By preparing a layered zinc gallate catalyst, the problem of difficult balance between the zinc-based catalyst activity and carbonate content in the prior art is solved, and the effect of significantly improving catalytic activity and selective maintenance is achieved. It is suitable for industrial-scale carbon dioxide-based polycarbonate synthesis.

CN119954636APending Publication Date: 2025-05-09EAST CHINA UNIV OF SCI & TECH
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Patent Information

Application Number
CN202510176576.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-02-18
Publication Date
2025-05-09

AI Technical Summary

Technical Problem

When existing heterogeneous zinc-based catalysts catalyze the alternating formation of polycarbonate by carbon dioxide and epoxide, the catalytic activity and carbonate unit content are difficult to balance, resulting in low activity, limiting their widespread use in industrial applications.

Method used

Using the preparation method of zinc gallate catalyst, zinc salt and gallate react in the presence of a low-carbon alcohol complexing agent to form a layered zinc gallate catalyst, increasing the Zn-OH active site and unsaturated coordination zinc site, thereby improving catalytic activity.

Benefits of technology

The catalytic activity is significantly improved, the balance between catalytic activity and carbonate unit content is achieved, while maintaining high selectivity, and the catalytic activity is even about 10 times that of ZnGA.

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Abstract

The invention discloses a preparation method and application of a zinc gallate catalyst for synthesizing carbon dioxide-based polycarbonate, and belongs to the technical field of catalysts.The zinc gallate catalyst is prepared through the steps that zinc salt and gallic acid (3, 4, 5-trihydroxybenzoic acid) are subjected to a reaction, low-carbon-number alcohol serves as a complexing agent, and a reaction solution is obtained; the copolymer can be applied to ring-opening copolymerization of carbon dioxide and epoxide, and a third monomer even a fourth monomer can be added on the basis to carry out ternary copolymerization and quaternary copolymerization to generate aliphatic polycarbonate with a multi-element structure. The activity of the zinc gallate catalyst for catalyzing ring-opening copolymerization of carbon dioxide and epoxypropane is larger than 900 g polymer / g catalyst, the content of carbonate units is larger than 96%, the selectivity is larger than 91%, the balance of the activity and the content of the carbonate units can be met, the synthesis process is simple, the reactant cost is low, and the zinc gallate catalyst is very suitable for industrial production of carbon dioxide-based polycarbonate.
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