A kind of reaction separation bifunctional catalytic membrane reaction device for catalyzing methanol dehydration to prepare dimethyl ether and its application

Abstract

The invention relates to a reaction and separation difunctional catalytic membrane reaction device for catalyzing dehydration of methanol to prepare dimethyl ether, and application of the reaction device. Specifically, the reaction device comprises an inner cavity and an outer cavity, wherein the inner cavity sequentially comprises a porous substrate, a first molecular sieve membrane combined on the surface of the porous substrate, and a second molecular sieve membrane combined on the surface of the first molecular sieve membrane from inside to outside; the space between the inner cavity and the outer cavity is filled with the feedstock gas-methanol. When the device is used for preparing the dimethyl ether, the second molecular sieve membrane not only can be used for catalyzing during a reaction, but is also capable of effectively avoiding or reducing the generation of by-products; the first molecular sieve membrane can be used for separating the reaction product-water vapor in a highly selective way, thus breaking through the balance limit of the reaction, and increasing the yield of the dimethyl ether. Therefore, the reaction device provides a new choice for the preparation of the dimethyl ether.

Description

technical field [0001] The invention relates to the technical field of dimethyl ether preparation, in particular to a reaction separation dual-function catalytic membrane reaction device for catalyzing methanol dehydration to prepare dimethyl ether and its application. Background technique [0002] With the continuous development of my country's economy, the contradiction of energy demand has become increasingly prominent, which seriously affects and restricts the comprehensive coordination and sustainable development of my country's economic society. The development and utilization of new alternative energy sources such as coal-based methanol, coal-based dimethyl ether, and biomass ethanol is of great strategic significance to alleviate the shortage of domestic oil supply and reduce my country's dependence on international oil. Among them, dimethyl ether, known as "clean fuel in the 21st century", has very good combustion performance, such as its high cetane number, high co...

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Problems solved by technology

However, the molecular sieve membrane reactors currently reported usually only have a single reaction or separation function, and cannot meet the requirements of dual-functional coupling of reaction and separation at the same time. To develop a dual-functional molecular sieve membrane with high-efficiency catalytic conversion of synthesis gas to prepare dimethyl ether with integrated reaction and separation Reactors remain a big challenge

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