SO3H-SBA-15 molecular sieve catalyst for catalyzing isobutene and carboxylic acid to synthesize carboxylic acid tert-butyl ester and preparation method and application thereof

Abstract

The invention discloses a SO3H-SBA-15 molecular sieve catalyst for catalyzing isobutene and carboxylic acid to synthesize carboxylic acid tert-butyl ester. The molecular sieve catalyst is prepared by adopting a template agent, a morphology regulator, a silicon source, a sulfonic acid source and an oxidizing agent through a one-step co-condensation method or a two-step sulfonic acid group post-synthesis method. In the SO3H-SBA-15 molecular sieve catalyst, by the molar ratio of a sulfonic acid group to silicon oxide, the sulfonic acid group supporting amount accounts for 30%-50%. The invention further discloses a method of using the SO3H-SBA-15 molecular sieve catalyst to catalyze the isobutene and the carboxylic acid for carboxylic acid tert-butyl ester synthesis. The molecular sieve catalyst is adjustable in shape, orderly in mesoporous pore passage and capable of efficiently and stably catalyzing the isobutene and the carboxylic acid to selectively synthesize the carboxylic acid tert-butyl ester under the conditions of higher temperature and polymerization inhibitor absence, meanwhile the separation energy consumption and equipment investment of reaction products are reduced, and the SO3H-SBA-15 molecular sieve catalyst has an important significance on development and utilization of atomic economic reaction.

Description

technical field [0001] The invention belongs to the field of chemical industry, and relates to a SO 3 H-SBA-15 molecular sieve catalyst and preparation method thereof, and the SO 3 Application of H-SBA-15 molecular sieve catalyst. Background technique [0002] Tert-butyl carboxylate has good solubility and can be widely used in a variety of environmentally friendly liquid materials, such as high-solid coatings, daily chemicals, inks, industrial cleaning agents, surfactants, etc., with great application potential and value . The direct addition and esterification of isobutene and carboxylic acid to synthesize tert-butyl carboxylate has a simple process and does not generate waste water. It not only reduces production costs, but also improves the yield of esterification, which has dual advantages of environmental protection and economy. U.S. Patent No. 5,994,578 uses a sulfonic acid-modified resin as a solid acid catalyst to catalyze the addition and esterification of isobu...

AI Technical Summary

Problems solved by technology

[0003] In order to improve the conversion rate of reactants and the selectivity of carboxylate, the above-mentioned enoesterification reaction process conditions not only require the doubling of the amount of carboxylic acid, but also need to add additional water or tert-butanol as an isobutylene inhibitor, which not only increases the separation of products Energy consumption also increases the requirements for the corrosion resistance of equipment and increases the investment cost of production equipment.

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