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

A cracking reaction and catalyst technology, applied in the field of catalyst and its preparation, can solve the problems of increased oligomerization side reaction, increased production cost, low space-time yield and the like, and achieves increased attractiveness, low unit consumption of raw materials, and side reactions. less effect

Active Publication Date: 2014-03-05
南通灵润医用新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1). Melt granulation

[0028] In parts by weight, blend 100 parts of polystyrene, 8 parts of polychlorotrifluoroethylene, 3 parts of chlorinated polyvinyl chloride and 3 parts of polyvinylidene fluoride, melt the mixture according to the conventional melt granulation method, and use nitrogen Press to a granulator to granulate, cool and then dry to obtain an intermediate product with a particle size of 0.5-1.2mm.

[0029] 2).Sulfonation reaction

[0030] The intermediate product that is processed in step 1) is packed in the fixed bed, then the dichloroethane that is dissolved with sulfur trioxide is sent into fixed bed and carries out sulfonation reaction, wherein sulfur trioxide accounts for 50% of dichloroethane quality, The mass ratio of sulfur trioxide to the intermediate product is 2, the sulfonation reaction temperature is 70° C., and the reaction time is 1 h. The resulting product number was M-1.

Embodiment 2

[0032] In step 1), the parts by weight of polyvinylidene fluoride were changed to 5 parts, and the others were the same as in Example 1. The resulting product number was M-2.

Embodiment 3

[0034] In step 1), the weight part of polyvinylidene fluoride is changed to 1 part, and the others are the same as in Example 1. The resulting product number was M-3.

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PUM

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/10C07C11/09C07C1/24
Inventor 张玲
Owner 南通灵润医用新材料有限公司
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