a co 2 Catalyst for synthesizing propylene carbonate with propylene oxide and preparation method thereof

Abstract

The invention discloses a catalyst for synthesis of propylene carbonate from CO2 and propylene oxide and a preparation method of the catalyst. The catalyst is prepared from an activated carbon carrier, a polymerization activity center with the molecular formula of C-(OC2H4)n(XkY(1-k) / 3C2H4(C4H4N2)p)m as well as a zirconium oxychloride aid, wherein X is a bromide ion, Y is a phosphate radical, k ranges from 0.5 to 0.7, p ranges from 0.6 to 0.9, n ranges from 160 to 340 and m ranges from 160 to 340. In the catalyst, the loading quantity of basic nitrogen cations in the activity center is very high on the catalyst, meanwhile, halogen anions and zirconium oxychloride react to produce oxyhalide anions with higher electronegativity, and thus, the oxyhalide anions have the high catalytic action and can realize reactions with high conversion rate at the high airspeed. The active component and the carrier in the catalyst are linked through valence bonds and closely combined, the loss rate of the active component is low, and the catalyst has the longer life cycle.

Description

technical field [0001] The present invention relates to a kind of highly active catalyst for synthesizing propylene carbonate and preparation method thereof, specifically relate to a kind of fixed bed reactor upper CO 2 Process for the preparation of a catalyst for the preparation of propylene carbonate with propylene oxide. Background technique [0002] The reaction of the cycloaddition of propylene oxide and carbon dioxide to generate propylene carbonate is an exothermic and volume-shrinking reaction, and the product propylene carbonate is an organic solvent and an organic synthesis intermediate with excellent performance. The reaction is to achieve CO 2 important way to reduce emissions. [0003] KI and TEABr are the most commonly used homogeneous catalysts. Its conversion rate and selectivity are high under high pressure. Quaternary ammonium and phosphonium salts such as octadecyltrimethylammonium bromide and tricyclohexylphosphine are good catalysts. Improving the ...

AI Technical Summary

Problems solved by technology

[0015] 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.

Catalysts grafted with quaternary ammonium salts or ionic liquids usually suffer from loss of active components and reduced catalytic activity.

The carrier is not suitable for molding and cannot be used for fixed bed reactions