Catalyst for hydrogenating cis-butenedioic anhydride to prepare butanedioic anhydride and its prepn and application

Abstract

The catalyst has active component Ni and carrier SiO2 and Al2O3 in the molar ratio of 1 to 1.47-5.98 to 0-3.3. The catalyst is prepared with Ni(NO3)2, ethyl metasilicate with or without aluminum nitrate and ethanol, and through pH regulation to 3-5 or 7-9 with acetic acid, ammonia water or urea, heating at 80-120 deg.c to form gel, roasting at 400-550 deg.c and reduction at 400-580 deg.c. One technological process of catalytically hydrogenating cis-butenedioic anhydride to prepare butasnedioic anhydride in the state with or without solvent is provided. The catalyst has the features of highspecific surface area, high dispersion of metal in carrier, high heat stability, high catalytic activity, high selectivity, capacity of being reused, easy separation from the product, low cost, low consumption and mild reaction condition.

Description

Technical field: [0001] The invention belongs to a nickel-based supported catalyst for preparing succinic anhydride by catalytic hydrogenation of maleic anhydride and its preparation and application. Background technique: [0002] Succinic anhydride, also known as succinic anhydride, has extensive and important uses in medicine, pesticides, petrochemicals, dyes, and alkyd resins. With the development of my country's pharmaceutical, pesticide, petrochemical and other industries, the demand for succinic anhydride is bound to increase. According to the report of China Chemical Industry Information Center, there is a certain gap in domestic succinic anhydride, especially for refined products with a content of more than 99%. Succinic anhydride is almost entirely imported. [0003] At present, succinic anhydride is mainly prepared by succinic acid dehydration method or maleic anhydride catalytic hydrogenation. The disadvantage of succinic acid dehydration method is that the proces...

AI Technical Summary

Problems solved by technology

Although the reaction conditions are relatively mild, it is difficult to separate the Ru-P complex from the product and the solvent, and the synthesis of the Ru-P complex is difficult and expensive.