Long-life catalyst for synthesis of propylene carbonate and preparation method thereof

Abstract

The invention discloses a preparation method of a high efficiency catalyst for synthesis of propylene carbonate. The method comprises the steps of: (1) dissolving imidazo[1, 2-a]pyrazine and dibromoalkane in methanol, then subjecting the product to distillation concentration to remove methanol so as to obtain a polyimidazole compound; (2) subjecting the polyimidazole compound prepared by step (1) and chloromethylated polystyrene to backflow in a toluene solvent for 1-3 days, performing filtration and washing, and then conducting vacuum drying at 60-80DEG C for 12-24h to obtain an active component A; (3) smashing the active component A with a zinc salt, resorcinol formaldehyde resin and urotropine together, performing mixing, and conducting tabletting molding to obtain an active precursor B; (4) heating the active precursor B under nitrogen protection to obtain an active precursor P; and (5) soaking the active precursor P in dibromoalkane, and carrying out soaking, separation, washing, drying and smashing so as to obtain a catalyst C. The catalyst prepared by the method has difficultly losable active component.

Description

technical field [0001] The invention relates to a long-life catalyst for synthesizing propylene carbonate and a preparation method thereof, in particular to a CO on a fixed bed reactor 2 Preparation method of catalyst for preparing propylene carbonate with propylene oxide. Background technique [0002] The cycloaddition of propylene oxide and carbon dioxide to form propylene carbonate is an exothermic and volume-reducing reaction, and the product propylene carbonate is an organic solvent with excellent performance and an intermediate in organic synthesis. The reaction is to achieve CO 2 an important way to reduce emissions. [0003] KI and TEABr are the most commonly used homogeneous catalysts. It has high conversion and selectivity at high pressure. Quaternary ammonium and quaternary phosphonium salts such as octadecyltrimethylammonium bromide and tricyclohexylphosphine are good catalysts. Increasing the ionization degree of the catalyst KI in the reaction can improve ...

AI Technical Summary

Problems solved by technology

[0014] However, there are many problems in the catalysts currently used. The homogeneous catalysts are not easy to separate, and the catalysts supported by inorganic ions such as alkali metal ions have the problem of easy loss of active components.

However, catalysts grafted with quaternary ammonium salts or ionic liquids usually have the problem of loss of active components and decreased catalytic activity.

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