Catalyst for continuous production of succinic anhydride from hydrogenation of maleic anhydride and preparation method thereof

Abstract

The invention provides a catalyst for continuously producing butanedioic anhydride by maleic anhydride hydrogenation. The catalyst is a nickel loaded catalyst prepared by an equivalent-volume impregnation method, wherein in the catalyst, the content of nickel is 13 to 20 weight percent, the content of accelerating agent is 1 to 7 weight percent, and a carrier is a composite oxide of SiO2 and Al2O3 or SiO2-Al2O3. A preparation method for the catalyst comprises the following steps: impregnating impregnation solution blended by ammonia water and active metal salt solution on a carrier subjected to baking pretreatment at a temperature between 400 and 800 DEG C by the equivalent-volume impregnation method to form the catalyst through drying, baking and reducing treatment. The catalyst is applied to continuously preparing the butanedioic anhydride by maleic anhydride hydrogenation on a fixed bed reactor, the conversion rate of maleic anhydride is more than or equal to 99.98 percent, and the selectivity of the butanedioic anhydride is more than or equal to 98.85 percent. The catalyst achieves the technical-scale continuous production of the butanedioic anhydride, and has the advantages of high activity, good selectivity, high yield (more than or equal to 98.83 percent) and long service life.

Description

technical field [0001] The invention relates to a nickel-loaded catalyst, in particular to a nickel-loaded catalyst used for hydrogenation of maleic anhydride on a fixed-bed reactor to continuously produce succinic anhydride and a preparation method thereof. Background technique [0002] Succinic anhydride (Succinic acid), also known as succinic anhydride, the molecular formula is C 4 h 4 o 3 , is an important organic synthetic raw material, widely used in medicine, food flavoring, pesticide, fine chemical industry, alkyd resin and other fields. In recent years, succinic anhydride has Applications such as glycol esters (PBS) and organic coatings have greatly increased the demand. [0003] The current production methods of succinic anhydride can be divided into three methods: succinic acid dehydration method; biological fermentation method and maleic anhydride hydrogenation method. The dehydration method of succinic acid is divided into direct dehydration method and chemi...

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Problems solved by technology

Although this process provides a continuous production method for succinic anhydride, its reaction pressure is relatively high, which requires special requirements for the design and material of the reactor, and the active metal content in the catalyst is 60wt%-65wt%, so Catalyst costs are high

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