Catalyst of synthetic propylene and application thereof

Abstract

A catalyst for synthesizing the propylene carbonate is composed of potassium salt (10-20 wt%), and activated carbon, metal oxide, or molecular sieve (80-90 wt%). The propylene carbonate is prepared through reaction between potassium salt, epoxy propane and iodomethane at 120-180 deg.C and 2-6 MPa for 0.5-2 hr. Its advantages are high catalytic activity, low cost and cyclic use.

Description

[0001] Field: [0002] The invention belongs to a catalyst for synthesizing propylene carbonate and a preparation method thereof, in particular to a catalyst for synthesizing propylene carbonate with carbon dioxide and propylene oxide and an application thereof. Background technique: [0003] The formation of propylene carbonate from carbon dioxide and propylene oxide under the action of a catalyst is one of the effective methods for fixing carbon dioxide, and the product has many uses. The company is used as a plasticizer, spinning solvent, dispersant for water-soluble dyes, extractant for olefins and aromatics, and a decarburizer in nitrogen fertilizer production. Using propylene carbonate as the electrolyte in lithium-ion batteries can make graphite anodes obtain protection, and can be used as a raw material for environmentally friendly chemicals dimethyl carbonate and polycarbonate. The catalysts commonly used for the cycloaddition reaction of carbon dioxide and propylene...

AI Technical Summary

Problems solved by technology

The catalysts commonly used for the cycloaddition reaction of carbon dioxide and propylene oxide are halogen compounds, n-Bu 3 Sn+nBu 4 PI organic transition metal halides and metal ether supported potassium iodide catalysts (Molecular Catalysis, 1998, 6, 409) have obtained high activity, but the preparation of the catalyst is relatively complicated

Kazuyoshi Takahashi of Japan (JP71-128778) proposed a complex catalyst of an alkali metal halide and a crown ether, which can make the reaction proceed smoothly and obtain a higher yield at a lower temperature and pressure. However, crown ether is highly toxic and expensive

Although there are many types, there are still problems such as complex catalyst preparation, high price, toxicity, and easy loss of catalyst active components in the reaction process, resulting in high cost of propylene carbonate preparation.