Tungsten and boron-containing two-phase catalyst, and preparation method and application thereof in epoxidation

Abstract

The invention discloses a tungsten and boron-containing two-phase catalyst, a preparation method and application thereof in epoxidation. The catalyst is used in a system of preparation of cyclohexene oxide from hydrogen peroxide cyclohexene oxide. The catalyst is in an interlayer of an aqueous phase and an oil phase, the catalyst cannot be dissolved in a cyclohexene reaction medium per se, under the action of hydrogen peroxide, the catalyst and the hydrogen peroxide jointly form an active specie which is easy to perform an electrophilic addition with the olefin, and the active specie has certain solubility in the oil phase, and brings active oxygen atoms into the oil phase so as to synthesize the cyclohexene oxide with high selectivity. The conversion rate of the cyclohexene is up to 46.58%, and the selectivity of the cyclohexene oxide to the cyclohexene is up to 88.06%; after reaction, the catalyst can be recycled by simple separation operation, and little catalyst dissolved in the oil phase can be recycled in a separating-out manner by adding solvent acetone. The preparation method of the catalyst disclosed by the invention is simple, the yield of the catalyst is high, the catalyst can be used in the system of preparing the cyclohexene oxide from the hydrogen peroxide cyclohexene oxide, and the obtained product, namely the catalyst is of a single type; the catalyst is environment-friendly, low in production cost and easy for large-scale industrial application.

Description

technical field [0001] The invention relates to a two-phase catalyst containing tungsten boron, its preparation method and its application in epoxidation. Background technique [0002] Cylohexene Oxide (Cylohexene Oxide) has a very active epoxy group in its molecular structure, so that it can react with amines, phenols, alcohols, carboxylic acids, etc. to generate a series of high value-added compounds, such as using it as a raw material It can be synthesized: pesticide decantide; unsaturated resin with high hardness, high temperature resistance, acid and alkali resistance; new type, high-efficiency photosensitive coating and photosensitive adhesive; crown ether; polycarbonate; important fine chemical adipaldehyde, etc. In addition, it is also a kind of organic solvent with strong solvency, which can be used as a reactive diluent for epoxy resin. [0003] Cyclohexene has a wide range of sources and low price, and is currently the main raw material for the preparation of epo...

AI Technical Summary

Problems solved by technology

Oxygen is the most ideal source of oxygen for oxidation reactions. It is highly valued by researchers because of its low price and convenient source. However, the direct use of molecular oxygen for epoxidation of olefins generally has poor selectivity and the reaction products are complex.

Due to its high selectivity, organic peroxides have been the darling of industrial production of epoxides, but organic peroxides are unstable, easy to decompose, difficult to store and high in cost

Hydrogen peroxide is used as an oxygen source, and the product is water. As long as a suitable catalyst is selected, it also has a high epoxidation selectivity. However, hydrogen peroxide and cyclohexene form a two-phase reaction system, which affects mass transfer and thus affects the reaction rate. , and epoxides are prone to hydrolysis, which affects the yield

At present, the two-phase catalysts used for epoxidation are the first to use tungsten and phosphorus catalysts, but their preparation is complicated and the reproducibility is poor.

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