Method for synthesizing succinic acid from maleic acid

Abstract

The invention discloses a method for synthesizing succinic acid from maleic acid. The method for synthesizing succinic acid from maleic acid comprises the following steps that 1, a catalyst is added into a fixed bed reactor; 2, hydrogen is fed into the fixed bed reactor so that the pressure is stabilized in a range of 5 to 35atm; the reaction system is heated to a temperature of 50 to 150 DEG C; and a maleic acid or maleate aqueous solution having a mass fraction of 1.0 to 25.0% passes through a catalyst bed layer at an airspeed of 0.01 to 5.00h<-1> and then enters into a liquid gathering tank, wherein in reaction, a feeding rate molar ratio of the hydrogen to the maleic acid or maleate aqueous solution is (3.0 to 15.0): 1; 3, reaction liquid obtained by the step 2 is cooled and filtered to form succinic acid or succinate and filtrate; 4, the obtained succinate is acidized and separated to produce succinic acid; and 5, the filtrate obtained by the step 3 is mixed with maleic acid and the excess hydrogen is recovered and recycled. The method for synthesizing succinic acid from maleic acid has the advantages of mild conditions, low cost and high product purity.

Description

Technical field

[0001] The invention relates to a method for synthesizing succinic acid from maleic acid. Background technique

[0002] Succinic acid, also known as succinic acid, is an important chemical raw material, widely used in surfactants, electroplating, medicine, food and other fields. In recent years, as the main raw material of biodegradable plastic polybutylene succinate (PBS), its demand has increased sharply.

[0003] At present, the main methods for producing succinic acid include biological fermentation and chemical synthesis. The biological fermentation method has the advantages of green and environmental protection, but its yield is low, the production cycle is long and the process is complicated, and it has the disadvantage of difficult industrialization. The chemical synthesis methods mainly include: paraffin oxidation method, electrochemical synthesis method and catalytic hydrogenation method. The traditional paraffin oxidation process is relatively mature, ...