Catalyst, method and uses of dimethyl ether synthesis using coal based synthetic gas in a slurry reactor

Abstract

The invention provides a catalyst for synthesizing dimethyl ether from coal-based synthesis gas on slurry bed, which comprises synthetic methanol catalyst C301 and dehydration catalyst by the weight ratio of 1-5:1. The dehydration catalyst comprises Al2O3 60-80%, ZnO 10-30%, MnO 10-30%, and is prepared through precipitation method. The prepared dehydration catalyst has homogeneous particle size distribution and large specific surface area.

Description

technical field [0001] The invention relates to a catalyst for synthesizing dimethyl ether, in particular to a catalyst for synthesizing dimethyl ether from coal-based synthesis gas in a slurry bed, a preparation method and an application. Background technique [0002] Dimethyl ether (DME) is a colorless, non-toxic product with little corrosion, no damage to the atmospheric ozone layer, and is easily degraded in the atmospheric troposphere, so it is called an environmentally friendly compound. [0003] Dimethyl ether is a traditional chemical industrial product with small output and demand. With the development of science, many new uses of dimethyl ether have been discovered, so its demand is also increasing. It can be used as a methylation reagent for the synthesis of medicine, pesticides and dyes; carbonylation to produce methyl acetate and acetic anhydride; it can replace chlorofluorocarbons as aerosol propellants to reduce the damage to the atmospheric ozone layer; it h...

AI Technical Summary

Problems solved by technology

However, when used in one-step synthesis of dimethyl ether, it shows the disadvantages of relatively low selectivity of product dimethyl ether and relatively high selectivity of by-products such as hydrocarbons.