Green production method of butanedioic acid

Abstract

The invention provides a green production method of butanedioic acid, and particularly relates to a method for producing butanedioic acid through performing catalytic hydrogenation reaction on hydrogen gas and one or free combination of several kinds of materials from maleic anhydride water solution, maleic acid water solution and fumaric acid water solution in a fixed bed tube reactor containing catalysts. According to the method, ordered mesoporous materials are used as carriers for loading precious metal to be used as hydrogenation catalysts; the generation of DL-malic acid through hydration reaction can be effectively avoided, so that the catalytic hydrogenation selectivity reaches 100 percent; the raw materials are completely converted into the butanedioic acid; the product purity reaches 99.5 percent or higher; meanwhile, the activity of the catalyst is high; the catalyst can be repeatedly used for many times. After the cooling crystallization of the water solution subjected to hydrogenation, the centrifugal mother liquid can be returned to be continuously used for preparing the hydrogenation raw materials; no waste gas, waste water and solid waste are discharged; the scaled continuous production of the butanedioic acid can be realized through the catalytic hydrogenation reaction by using the fixed bed tube reactor.

Description

technical field [0001] The invention provides a green production method of succinic acid. Specifically, in a fixed-bed tubular reactor equipped with a catalyst, one of maleic anhydride aqueous solution, maleic acid aqueous solution and fumaric acid aqueous solution is A method for producing succinic acid by carrying out catalytic hydrogenation reaction with hydrogen or several arbitrary combinations, relates to the field of succinic acid production. Background technique [0002] Succinic acid is the scientific name of succinic acid, which is a white crystal with molecular formula C 4 h 6 o 4 , melting point 185°C, relative density 1.572, solubility in water at room temperature is about 8g. Succinic acid is an important organic chemical raw material and intermediate, widely used in surfactants, ion chelating agents, food additives and pharmaceutical industries. Polybutylene succinate (PBS) obtained by polycondensation of succinic acid and 1,4-butanediol is a completely bi...

AI Technical Summary

Problems solved by technology

[0008] 1. The currently used catalysts such as Pd / C, Pt / C, Raney nickel, etc. are not very selective, and the catalytic hydrogenation and hydration reactions are carried out at the same time, which will generate DL-malic acid as a by-product;

[0009] 2. The metal active components in some supported catalysts, such as Fe, Co, Ni, etc., will dissolve in acidic aqueous solution, causing catalyst loss, reducing catalytic activity and affecting product quality;

[0010] 3. The reaction temperature is low, the by-product malic acid is less, but the reaction is slow, and the solubility of succinic acid is small, and it is easy to precipitate and block the pipeline;

[0011] 4. The reaction temperature is high and the reaction is fast, but there are many by-products of malic acid and the yield is low