Catalyst for tert-butyl alcohol cleavage reaction and preparation method thereof

Abstract

The invention provides a catalyst for tert-butyl alcohol cleavage reaction, which is prepared by the following steps: by using a melt granulation process, blending and melting polystyrene, chlorinated polyvinyl chloride, polytrifluorochloroethylene and polyvinylidene fluoride, and granulating; and carrying out sulfonation reaction on the granulation product in the fixed bed and sulfur trioxide to obtain the catalyst. When being used for tert-butyl alcohol cleavage reaction, the catalyst has the advantages of high selectivity for technique reaction, fewer side reactions and low shedding tendency of sulfo-group under high-temperature conditions. The invention also provides a preparation method of the catalyst.

Description

technical field [0001] The invention relates to a catalyst and a preparation method thereof, in particular to a catalyst for tert-butanol cracking reaction and a preparation method thereof. Background technique [0002] At present, there are three main methods for industrial production of isobutene: absorption of sulfuric acid from the C4 fraction; dehydration of tert-butanol under the catalysis of activated alumina, sulfonic acid, ion exchange resin, etc.; separation of the C4 fraction by physical adsorption. Domestically, a batch-type device is used, and tert-butanol is decomposed into isobutene by heating under the action of a dehydration catalyst. Isobutene leaves the reaction system through the gas port, and water remains in the system. As the reaction progressed, the water content increased, the concentration of tert-butanol decreased, and the formation rate of isobutene decreased significantly. [0003] US5849971 adopts catalytic rectification process, sulfonic acid...

AI Technical Summary

Problems solved by technology

In this process, the water content of the circulating tert-butanol aqueous solution is higher than the water content at the azeotropic point of the mixture, and the circulation volume is large, the space-time yield is low, and the energy consumption is high.

[0006] The above patented technologies all have the disadvantages of high reaction temperature and short service life of the catalyst. The shortcomings are mainly reflected in the poor stability of the resin catalyst. Deactivation, corrosion of equipment and pollution of products; as the temperature rises, the selectivity of resin catalysts becomes worse, side reactions of oligomerization increase, and by-products increase. Frequent replacement of catalysts will affect production efficiency and increase production costs. Therefore, how to extend the service life has become a become an urgent problem