Composite high-efficiency catalyst for preparing succinic anhydride through maleic anhydride body hydrogenation and preparation method of composite high-efficiency catalyst

Abstract

The invention discloses a composite efficient catalyst for preparing succinic anhydride through maleic anhydride body hydrogenation and a preparation method thereof. The catalyst is prepared from, by mass, 100 parts of a carrier gamma-Al2O3, 25-200 parts of an active ingredient Ni(NO3)2.6H2O, 20-30 parts of a composite solvent and 20-30 parts of a metal synergist, and the metal synergist comprises, by mass, 100 parts of the carrier gamma-Al2O3 and 25-200 parts of the active ingredient Ni(NO3)2.6H2O. The addition amount of the composite solvent is 0.1-1.8 times of the molar weight of Ni in the active component Ni(NO3)2.6H2O, and the addition amount of the metal synergist is 0.1-2% of the molar weight of Ni in the active component Ni(NO3)2.6H2O. The preparation method comprises the following steps: dropwise adding an active agent aqueous solution and a Na2CO3 aqueous solution which are prepared in advance into a prepared carrier suspension solution in a parallel flow manner, performing reacting, aging, filtering, washing and drying to obtain a catalytic precursor, reducing the catalytic precursor in a hydrogen atmosphere, and solidifying paraffin to obtain a finished product of the catalyst. The catalyst prepared by the process has the advantages of high activity, good selectivity, strong anti-coking property and toxicity resistance, long service life and multiple reuse times.

Description

technical field [0001] The invention belongs to the technical field of chemical production, and in particular relates to a preparation method of a composite high-efficiency catalyst for producing succinic anhydride by bulk hydrogenation of maleic anhydride. Background technique [0002] The catalytic hydrogenation product of maleic anhydride, succinic anhydride, is an important fine chemical raw material, and the molecular formula of succinic anhydride is C 4 h 4 o 3 , the molecular weight is 100.07, it is colorless needle-like or flaky crystal, slightly soluble in cold water and ether, soluble in hot water and ethanol, with a melting point of 119.6°C and a boiling point of 261°C, widely used in surfactants, pharmaceuticals, and food additives And pharmaceutical intermediates, can be used in the manufacture of raw gastric ketone, succinimide and other drugs. Succinic anhydride is a raw material for the preparation of paints, synthetic resins, and dyes. Coatings and resin...

AI Technical Summary

Problems solved by technology

Using the catalyst under the conditions of pressure 0.5-3MPa, temperature 120-180°C, reaction for 1-3 hours, nickel:maleic anhydride molar ratio 0.3-1.6:100 (mass ratio 0.18-0.95:100) under the conditions of direct maleic anhydride hydrogenation reaction to form Succinic anhydride, maleic anhydride conversion rate 100%, succinic anhydride selectivity 99.5%; In the preparation process of above-mentioned succinic anhydride, there are following deficiencies, the catalyst consumption of Chinese patent CN92103481.4 is large, maleic anhydride conv