A kind of immobilized heteropolyacid catalyst and its preparation method and application

Abstract

The invention discloses a solid-loaded heteropolyacid catalyst, a preparation method and application thereof. The catalyst comprises a quaternary amination resin and a phosphorus-containing heteropolyacid anion, and the structural unit included in the quaternization resin, wherein, is a polymer carrier, R 2 for C 2～3 The alkyl group, R is C 13～20 long carbon chain alkyl or C 3～6 A short carbon chain alkyl group, x is an integer of 1-5, y is an integer of 400-1000, and j is an integer of 0-5. The catalyst has a high nitrogen content and a high loading capacity of phosphorus-containing heteropolyacid anions. The catalytic activity and selectivity can be regulated by the carbon chain length of the quaternary ammonium salt cation and the molar ratio of phosphorus to heteroatoms. The catalyst is easy to recycle and reuse Stable performance and other characteristics. The catalyst solves the problems that phase transfer catalysts are difficult to recycle and reuse, and the process is complicated. It can replace the use of metal salts and phase transfer catalysts to a certain extent, and because of its catalytic activity and selectivity can be adjusted, it can adapt to different olefin reactants. .

Description

technical field [0001] The invention belongs to the field of catalysts, and in particular relates to a solid-supported heteropolyacid catalyst and its preparation method and application. Background technique [0002] Olefin epoxides are important intermediates in organic synthesis, pharmaceuticals, and perfume industries. In recent years, the demand for epoxides at home and abroad has increased sharply, and the supply of epoxides is in short supply. Industrially, epoxides other than ethylene oxide are mostly prepared by halohydrin method or hydrogen peroxide catalytic epoxidation method. In the haloalcohol method, the selectivity of epoxides is high, but there are many reaction steps, the material consumption and energy consumption are high, and a large amount of high-salt wastewater is produced, causing serious pollution. The hydrogen peroxide catalytic epoxidation method has the advantages of one-step synthesis, greenness, economy, and no environmental pollution, but requ...

AI Technical Summary

Problems solved by technology

However, due to the limited active sites of the quaternary ammonium salt resin used and the lack of control over the activity of the catalyst, the catalytic ability of the catalyst is limited and its application is limited.

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