Tetrabutylphosphonium carboxylate ionic liquid, its preparation method and application in catalytic synthesis of polycarbonate
By heating chlorobutane and tributylphosphine under a protective atmosphere, concentrating and recrystallizing the mixture, high-purity tetrabutylphosphonium chloride was prepared. This chloride was then reacted with carboxylate ions and washed with water to remove impurities. This method solved the problems of harsh preparation conditions and catalyst residue in existing tetrabutylphosphonium chloride preparations, and achieved efficient catalytic synthesis of high-quality polycarbonate.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- LANZHOU INSTITUTE OF CHEMICAL PHYSICS CHINESE ACADEMY OF SCIENCES
- Filing Date
- 2026-05-19
- Publication Date
- 2026-07-17
AI Technical Summary
The existing tetrabutylphosphonium chloride preparation conditions are harsh, energy consumption is high, and safety risks are significant. Furthermore, catalyst residues cause polycarbonate products to discolor and become brittle, affecting their quality and performance. The existing tetrabutylphosphonium carboxylate catalysts have low purity, leading to a decline in the quality of polycarbonate products.
High-purity tetrabutylphosphonium chloride was prepared by heating chlorobutane and reacting it with tributylphosphine under a protective atmosphere, followed by concentration and recrystallization. Then, it was reacted with carboxylate ion exchange and washed with water to remove impurities, yielding a high-purity tetrabutylphosphonium carboxylate ionic liquid, which was used for the synthesis of polycarbonate by melt transesterification.
The preparation of tetrabutylphosphonic acid salt with low energy consumption and low risk has been achieved. It has high catalytic activity, uniform molecular weight distribution of polycarbonate products, low yellowing index, high light transmittance, and excellent mechanical properties, making it suitable for the industrial production of high-end polycarbonate.
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Figure CN122404409A_ABST