Method for synthesizing succinic acid from maleic acid

A technology of maleic acid and succinic acid, which is applied in the direction of ozone oxidation to prepare carboxylic acid, etc., can solve the problems of low product quality, complicated process, and high requirements for operating conditions, and achieve high product quality, simplified process, and low reaction temperature Effect

Active Publication Date: 2013-11-13
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hydrogenation reaction in this process is carried out under high temperature, high pressure, and the presence of organic solvents. The operating conditions are relatively high, the process is complicated, and the product quality is not high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] After loading 6.0 g of palladium / strongly acidic cationic resin catalyst with a palladium loading of 0.2% (mass fraction) into the fixed-bed reactor, pass hydrogen and make the pressure stable to 15 atm, and heat the reactor to 70° C. Utilize feed pump, make mass fraction be 20.0% maleic acid aqueous solution at space velocity 1.00h -1 Pass through the catalyst bed and enter the liquid collection tank. During the reaction, the hydrogen to maleic acid feed rate was maintained at a molar ratio of about 7.0. The obtained reaction solution was cooled and filtered to obtain white succinic acid crystals and a colorless filtrate. The resulting filtrate is mixed with maleic acid, and the excess hydrogen is recovered for reuse. Through HPLC analysis, the conversion rate of maleic acid reaches 99.9%, the selectivity of succinic acid is 99.8%, and the purity of succinic acid is about 99.9%.

Embodiment 2

[0018] After loading 4.0 g of platinum / silicon dioxide with a platinum loading of 0.5% (mass fraction) into the fixed-bed reactor, hydrogen was passed through to stabilize the pressure to 5 atm, and the reactor was heated to 50°C. Utilize feed pump, make mass fraction be 1.0% maleic acid aqueous solution at space velocity 5.00h -1 Pass through the catalyst bed and enter the liquid collection tank. During the reaction, the hydrogen to maleic acid feed rate was maintained at a molar ratio of about 3.0. The obtained reaction solution was cooled and filtered to obtain white succinic acid crystals and a colorless filtrate. The resulting filtrate is mixed with maleic acid, and the excess hydrogen is recovered for reuse. Through HPLC analysis, the conversion rate of maleic acid reaches 99.8%, the selectivity of succinic acid is 99.9%, and the purity of succinic acid is about 99.9%.

Embodiment 3

[0020] After loading 10.0 g of ruthenium / activated carbon catalyst with a ruthenium loading of 2.0% (mass fraction) into the fixed-bed reactor, hydrogen was passed through to stabilize the pressure to 25 atm, and the reactor was heated to 90° C. Use the feed pump to make the "acid water" with a mass fraction of 25.0% flow at a space velocity of 1.00h -1 It enters the liquid collection tank through the catalyst bed. During the reaction, the hydrogen to maleic acid feed rate was maintained at a molar ratio of about 10.0. The obtained reaction solution was cooled and filtered to obtain white succinic acid crystals and a colorless filtrate. The resulting filtrate is mixed with maleic acid, and the excess hydrogen is recovered for reuse. Through HPLC analysis, the conversion rate of maleic acid reaches 99.9%, the selectivity of succinic acid is 99.2%, and the purity of succinic acid is about 99.7%.

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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, it has seen a sharp increase in demand as the main raw material for the biodegradable plastic polybutylene succinate (PBS). [0003] At present, the methods for producing succinic acid mainly include biological fermentation and chemical synthesis. The biological fermentation method has the advantages of greenness and environmental protection, but its yield is low, the production cycle is long and the process is complicated, and it has the disadvantages of difficulty in industrialization. Chemical synthesis methods mainly include: paraffin oxidation method, electrochemical synthesis method and catalytic hydrogenation method. The traditional paraffin oxidation proces...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C55/10C07C51/36
Inventor 高志贤郗宏娟庆绍军侯晓宁胡蕴青李林东
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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