Formula and prepn process for epoxidating propylene to prepare epoxy propane catalyst in oxy-hydrogen atmosphere

Abstract

The catalyst for epoxidation propylene to prepare epoxy propane in oxy-hydrogen atmosphere consists of Pd, Pt, transition metal compound and titanium silicone molecular sieve. The preparation of the catalyst includes soaking to make Si-Ti molecular sieve carry compounds of Pd and Pt to prepare double-function Pd-Pt-Si molecular sieve catalyst; mixing nano level transition metal compound with the said Pd-Pt-Si molecular sieve catalyst to obtain Pd-Pt-Si-transition metal molecular sieve catalyst system; and activation in reducing atmosphere. The present invention one green synthesis process andcan result in epoxy propane yield up to 8.3 wt% and selectivity of 70% and no any environmental pollution.

Description

technical field [0001] The invention relates to a catalyst formula and a preparation process for propylene epoxidation to propylene oxide in a hydrogen-oxygen atmosphere. Background technique [0002] Propylene oxide (PO) is an important chemical raw material. At present, there are two production processes that have been industrialized in the world, one is the chlorohydrin method, and the other is the co-oxidation method, both of which use propylene as a raw material. The two methods are adopted in foreign countries, each accounting for half, and the domestic method mostly adopts the chlorohydrin method. The disadvantage of the chlorohydrin method is that the environment is seriously polluted, and the production of one ton of PO produces about 60 tons of chlorinated organic waste water. The co-oxidation method co-produces many by-products. U.S. ARCO Corporation, DOW Chemical Corporation, SHELL Chemical Corporation, etc. have used propylene as a raw material, hydrogen pero...

AI Technical Summary

Problems solved by technology

ARCO Corporation, DOW Chemical Corporation, SHELL Chemical Corporation, etc. in the United States have used propylene as a raw material, hydrogen peroxide solution as an oxidant, and used titanium silicon molecular sieve as an epoxidation catalyst to prepare PO. The cost of hydrogen peroxide solution (30%) is high, the transportation volume is large, and the subsequent distillation load is too large