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, organic chemistry, etc., can solve the problems of complex process, low product quality, and high operating conditions, and achieve simplified process, high product quality, The effect of low reaction temperature

Active Publication Date: 2012-04-18
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

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Problems solved by technology

The hydrogenation reaction in this process is carried out under high temperature, high pressure, and the presence of organ

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] After 6.0 g of palladium / strongly acidic cation resin catalyst with a palladium loading of 0.2% (mass fraction) is loaded into the fixed bed reactor, hydrogen gas is passed and the pressure is stabilized to 15 atm, and the reactor is heated to 70°C. Using the feed pump, make the maleic acid aqueous solution with a mass fraction of 20.0% at a space velocity of 1.00h -1 Pass through the catalyst bed and enter the liquid collection tank. During the reaction, the molar ratio of the feed rate of hydrogen to maleic acid was maintained at about 7.0. After cooling and filtering the obtained reaction liquid, white succinic acid crystals and a colorless filtrate are obtained. The obtained filtrate is mixed with maleic acid, and the excess hydrogen is recovered and reused. According to HPLC analysis, the conversion rate of maleic acid reached 99.9%, the selectivity of succinic acid was 99.8%, and the purity of succinic acid was about 99.9%.

Embodiment 2

[0018] After 4.0 g of platinum / silica with a platinum loading of 0.5% (mass fraction) is loaded into the fixed bed reactor, hydrogen gas is passed and the pressure is stabilized to 5 atm, and the reactor is heated to 50°C. Using the feed pump, make the maleic acid aqueous solution with a mass fraction of 1.0% at a space velocity of 5.00h -1 Pass through the catalyst bed and enter the liquid collection tank. During the reaction, the molar ratio of the feed rate of hydrogen to maleic acid was maintained at about 3.0. After cooling and filtering the obtained reaction liquid, white succinic acid crystals and a colorless filtrate are obtained. The obtained filtrate is mixed with maleic acid, and the excess hydrogen is recovered and reused. According to HPLC analysis, the conversion rate of maleic acid reached 99.8%, the selectivity of succinic acid was 99.9%, and the purity of succinic acid was about 99.9%.

Embodiment 3

[0020] After 10.0 g of ruthenium / activated carbon catalyst with a ruthenium loading of 2.0% (mass fraction) is loaded into the fixed bed reactor, hydrogen gas is passed and the pressure is stabilized to 25 atm, and the reactor is heated to 90°C. Using the feed pump, make the "acid water" with a mass fraction of 25.0% at a space velocity of 1.00h -1 Pass through the catalyst bed and enter the liquid collecting tank. During the reaction, the molar ratio of the feed rate of hydrogen to maleic acid was maintained at about 10.0. After cooling and filtering the obtained reaction liquid, white succinic acid crystals and a colorless filtrate are obtained. The obtained filtrate is mixed with maleic acid, and the excess hydrogen is recovered and reused. According to HPLC analysis, the conversion rate of maleic acid reached 99.9%, the selectivity of succinic acid was 99.2%, and the purity of succinic acid was 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, 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, ...

Claims

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Application Information

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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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