Preparation method of novel high-efficiency environmental-protection compound ion liquid catalyst used for synthesizing high-quality propene carbonate

Abstract

The invention relates to a preparation method of a high-efficiency environmental-protection compound ion liquid catalyst used for synthesizing high-quality propene carbonate. The invention has the technical scheme of comprising the following steps of: (1) reacting halogenated alkane and methylimidazole in a reaction kettle according to a proportion; (2) washing by using an ester compound, settling after stirring fully, and stratifying; (3) distilling off the unreacted halogenated alkane, the ester compound and light impurities under a decompression condition; (4) adding a metal halide catalysis aid to obtain a novel compound ion liquid catalyst; and (5) taking propylene oxide and carbon dioxide as raw materials and novel compound ion liquid as the catalyst, and synthesizing the propene carbonate. The invention has the advantages that the cost of the catalyst is low, the inactivation of the catalyst is slow, the service life is long, and the annual use cost is equivalent to 1 / 4 to 1 / 5 of that of a tetraethyl ammonium halide catalyst; and the activity of the catalyst is high, the reaction speed is high, the selectivity is high, and the yield of the propene carbonate can reach 97 to 98 percent.

Description

1. Technical field: [0001] The invention relates to a chemical preparation method, in particular to a preparation method of a novel high-efficiency and environment-friendly composite ionic liquid catalyst used for synthesizing high-quality propylene carbonate. 2. Background technology: [0002] Propylene carbonate (PC) is a high-boiling-point and high-polarity organic solvent with excellent performance, which has been widely used in organic synthesis, cosmetics, gas separation, battery electrolyte and metal extraction and other fields. In recent years, many urea manufacturers have used it as a decarburizing agent, which has greatly increased the demand. PC synthesis methods mainly include phosgene method, transesterification method, chlorine [0003] Propanol method and propylene oxide (PO) and CO2 cycloaddition method, etc. Using PO and CO2 as raw materials to produce PC through cycloaddition is a low-pollution and environmentally friendly route. The reported catalysts f...

AI Technical Summary

Problems solved by technology

At present, it has been applied in Friedel-Crafts, alkylation, isomerization, olefin dimerization and catalytic hydrogenation in foreign countries. However, although there are many reports in the cycloaddition reaction of PO and CO2, it has not yet been realized. industrialization

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