Integral supported carbon molecular sieve catalyst, preparing method and applications thereof

Abstract

An integral supported carbon molecular sieve catalyst, which is composed of integral honeycomb cordierite and carbon nanotubes, HZSM-5 type molecular sieve, wherein carbon nanotubes account for 7-20 parts, HZSM-5 accounts for 10-30 parts, cordierite Accounted for 60 to 80 copies. Preparation method: firstly, carbon nanotubes are grown in situ on monolithic honeycomb cordierite by chemical vapor deposition method, and this is used as a carrier, and ZSM-5 molecular sieve is grown on the carrier by secondary growth method. The monolithic supported carbon molecular sieve catalyst was applied in the synthesis of dimethyl ether from methanol dehydration.

Description

technical field [0001] The invention belongs to a novel synthesis technology of methanol dehydration to dimethyl ether, in particular to the preparation of an integral supported carbon molecular sieve catalyst and its application in methanol dehydration to dimethyl ether. Background technique [0002] At present, the production methods of methanol dehydration to dimethyl ether are mainly as follows: [0003] A. Methanol liquid phase dehydration method. Traditional liquid-phase dehydration of methanol to produce dimethyl ether is to form methyl bisulfate first in the presence of concentrated sulfuric acid, and then generate dimethyl ether. Although the reaction conditions of this process are mild (130-160°C), the single-pass conversion rate of methanol is high (>80 %), good selectivity (>98%), but the process equipment is corroded, the intermediate product is toxic, the residual liquid in the kettle and the waste water seriously pollute the environment, and it has tend...

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Problems solved by technology

However, all of these catalysts are granular. In the process of dehydration of fixed bed methanol to synthesize dimethyl ether, it is difficult to remove the heat of reaction in time, the generated water cannot be separated from the surface of the catalyst in time, the space velocity is low, and the bed temperature difference is large. and other problems seriously affect the service life of the catalyst and the single-pass conversion rate of the reaction.

Patents CN2723451Y, CN2928846Y, CN2900523Y, etc. solve the above problems by improving the reaction equipment, and have achieved certain effects, but there are weaknesses such as long process flow, complicated equipment, and large investment.