Immobilized Catalysts of Silane-Coupled Molecular Sieves and Double Salt Ionic Liquids

Abstract

The invention belongs to the technical field of catalysts, and relates to a preparation method of a solid-supported catalyst of a silane coupling molecular sieve and a double salt ionic liquid. First, the equal mass of molecular sieve and silane were reacted in toluene solvent at 110°C for 24 h, and the toluene solvent was removed by rotary evaporation, and the sample was placed in a vacuum drying oven to dry for 12 h to obtain silane molecular sieve; then functionalized ionic liquid and Lewis acid Reaction, prepare double salt ionic liquid, mix it with silane molecular sieve, react in acetonitrile solvent for 24 h, then remove acetonitrile by rotary evaporation, extract the obtained sample with dichloromethane Soxhlet for 24 h, and then put it in a vacuum drying oven to dry for 8 h Finally, the target product silane coupling molecular sieve / double salt ionic liquid solid-supported catalyst is obtained. Finally, the immobilized catalyst was blended with a small amount of silica sol, squash powder, etc., and a catalyst sample was prepared using a catalyst molding extrusion device. After drying at 100°C for 10 h, it was used for continuous catalytic conversion of CO2 and propylene oxide in a fixed bed, and synthesized High purity propylene carbonate product.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and relates to a method for preparing a solid-supported catalyst of a silane-coupled molecular sieve and a double salt ionic liquid, in particular to a catalyst for preparing propylene carbonate by continuously catalyzing the cycloaddition reaction of carbon dioxide and propylene oxide . Background technique [0002] Alkylene oxide is the second largest industrial chain downstream of olefins. The by-product of its industrial production process is mainly CO2, and about 200-300 kg of CO2 is produced per ton of epoxide produced. Studies have shown that the carbonylation coupling reaction of CO2 and epoxy compounds to prepare cyclic carbonates is a reaction in line with the principle of "green and sustainable development". It is not only an effective way to achieve energy saving and emission reduction and low-carbon economic development, but also opens up A new route of non-petroleum raw materials...

AI Technical Summary

Problems solved by technology

[0003] Purpose of the invention: The technical solution of the present invention is to overcome the shortcomings of the existing technology that cannot realize the fixed-bed continuous catalytic conversion of carbon dioxide and the separation and treatment of traditional catalysts, the catalytic efficiency and selectivity are not high enough, and the service life is short. Preparation method of immobilized catalyst of silane coupling molecular sieve and double salt ionic liquid

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