Solid catalyst for synthesizing dimethyl ether by gas-phase method, its preparation and reactive process

Abstract

A solid catalyst for the gas-phase synthesis of dimethylether is composed of ZSM-5 molecular sieve (50-90 Wt%) and zirconium oxide or MCM-41 molecular sieve (10-50 Wt%). Its preparing process and reaction technology are also disclosed.

Description

technical field [0001] The invention relates to a solid catalyst for gas-phase synthesis of dimethyl ether, a preparation method and a reaction process. Background technique [0002] Dimethyl ether, referred to as DME, is the simplest aliphatic ether and an important organic chemical raw material. It is widely used in pharmaceuticals, fuels, pesticides, daily chemicals and other industries. [0003] For a long period of time, dimethyl ether was obtained by rectification as a by-product of high-pressure synthesis of methyl ether. With the rise of low-pressure synthesis of methyl ether, foreign high-pressure methyl ether units were almost replaced by low-pressure methods. The technology of catalytic dehydration of methanol and synthesis of dimethyl ether from synthesis gas. [0004] As the Chinese government attaches great importance to environmental protection, the domestic production of dimethyl ether has started in recent years. Recently, some domestic research institutes...

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Problems solved by technology

[0006] In the previous work, we prepared ZSM-5 molecular sieve catalyst for the vapor phase synthesis of dimethyl ether from methanol, and achieved good results. The temperature in the reactor is too high, and the temperature of the catalyst bed in the reactor can be increased by about 50°C to 100°C within 2 to 5 minutes. It is difficult to control the reaction temperature at the initial stage of the reaction in industrial production.