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 conversion rate and succinic anhydride The selectivity of acid anhydride is low, and the hydrogenation temperature and pressure are high, and the product quality is impure; the Chinese patent CN103007929A uses noble metal Pd to prepare the catalyst and the cost is high; the patent CN1453066A prepares the catalyst to gel the process is complicated, it is difficult to realize industrial production, and the catalyst needs high-temperature roasting after drying , the dosage of nickel is 0.77wt% of maleic anhydride, and the amount of nickel is large