Preparation process of succinic acid

A technology of succinic acid and succinic anhydride, which is applied in the preparation of carboxylic anhydride, metal/metal oxide/metal hydroxide catalyst, organic chemistry, etc. The effect of small internal and external mass transfer resistance, simple process and uniform reaction temperature

Active Publication Date: 2021-04-16
CHINA CHEM TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the production process needs to use 4 stages of cold hydrogen and a large amount of reaction liquid circulation to control the heat release of the reaction, the whole process is relatively complicated
And the main product that this process method makes is gamma-butyrolactone, and the selectivity to succinic anhydride is poor

Method used

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  • Preparation process of succinic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] 1.1 Catalyst preparation process:

[0061] Take successively 1000 g of alumina microsphere carrier with a particle size distribution of 2-20 μm and 2 L of palladium chloride solution with a concentration of 5 g / L. Add the alumina microsphere carrier to the rotary evaporator, set the temperature of the water bath to 60°C, and set the speed to 100 rpm, spray the palladium chloride solution onto the surface of the carrier, after the palladium chloride solution is sprayed, continue the rotary evaporation Until the catalyst precursor dries into a flowable powder. The catalyst precursor was placed in a muffle furnace and calcined at 350° C. for 3 hours.

[0062] The calcined catalyst precursor was reduced in a nitrogen-hydrogen mixed atmosphere, V (hydrogen): V (nitrogen) = 5:95, the reduction temperature was 200 ° C, and the time was 6 hours to obtain a pre-reduced catalyst.

[0063] 1.2 Maleic anhydride hydrogenation-hydrolysis to prepare succinic acid:

[0064] (1) Weig...

Embodiment 2

[0071] Adopt the catalyst of embodiment 1 to carry out maleic anhydride hydrogenation-hydrolysis and prepare succinic acid, comprise the steps:

[0072] (1) Weigh 0.3Kg of the hydrogenation catalyst prepared in Example 1, and add the catalyst to the catalyst feeding tank;

[0073] (2) Weigh 20Kg of industrial maleic anhydride, add it to a raw material tank with a volume of 50L, heat the raw material tank to 65°C, and after the maleic anhydride is completely melted, transfer the catalyst in step (1) from the catalyst feeding tank to the raw material tank Middle; turn on the raw material tank agitator to stir, start the raw material liquid circulation pump, the raw material slurry enters the circulation pump from the bottom of the raw material tank, and returns to the raw material tank from the middle of the raw material tank;

[0074] (3) The raw material slurry is preheated to 120°C in the preheater, flows in parallel with hydrogen, and enters the catalyst bed from the bottom ...

Embodiment 3

[0079] 3.1 Preparation of catalyst:

[0080] Sequentially take 500 g of alumina microsphere carrier with a particle size distribution of 10-30 μm and 1 L of palladium chloride solution with a concentration of 10 g / L. Add the carrier to the rotary evaporator, set the temperature of the water bath to 60°C, and set the speed to 100 rpm, spray the palladium chloride solution onto the surface of the carrier, after the palladium chloride solution is sprayed, continue the rotary evaporation until the catalyst precursor Dried into a mobile powder. The catalyst precursor was placed in a muffle furnace and calcined at 350° C. for 3 hours.

[0081] The calcined catalyst precursor was reduced in a nitrogen-hydrogen mixed atmosphere, V (hydrogen): V (nitrogen) = 5:95, the reduction temperature was 200 ° C, and the time was 3 hours to obtain a pre-reduced catalyst.

[0082] 3.2 Preparation of succinic acid:

[0083] (1) Weigh 0.4Kg of the pre-reduced hydrogenation catalyst, and add the c...

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Abstract

The invention discloses a preparation process of succinic acid, which comprises the following steps: using maleic anhydride as a raw material; under the action of a microsphere catalyst, carrying out direct liquid-phase hydrogenation by using a slurry reactor to prepare succinic anhydride, and performing hydrolyzing to produce succinic acid, so that the reaction process is solvent-free, the energy consumption generated by separation is avoided, the materials are backmixed in the reactor, and external circulation heat removal is not required in the reaction process; meanwhile, a large amount of reaction liquid does not need to be circularly diluted, the reaction temperature is uniform, no hot spot exists in the reactor, and an over-temperature phenomenon does not occur even if the hydrogenation catalyst is applied to a strong exothermic reaction, so that the hydrogenation catalyst has good activity and stability, reaction materials do not need to be diluted by adopting a solvent, and energy consumption can be greatly reduced; in addition, no water is generated in the hydrogenation reaction process, no acid is generated through hydrolysis, and equipment does not need a special corrosion-resistant material.

Description

technical field [0001] The invention belongs to the field of chemical preparation technology, in particular to a production technology of succinic anhydride / succinic acid. Background technique [0002] Succinic acid is an important "C4 platform compound", which is often used as an important organic chemical raw material and intermediate, and is widely used in food, medicine, agriculture, chemical industry and other fields. Among them, the most potential application fields of succinic acid are synthetic biodegradable plastics PBS (polybutylene succinate), PHS (polyhexylene succinate), etc. PBS is currently recognized in the world as the fully degradable plastic variety with the best comprehensive performance, which can be 100% degraded into CO under natural conditions. 2 and H 2 O, thus has excellent biocompatibility and bioabsorbability. [0003] With the gradual improvement of policies and people's awareness of environmental protection, the market for fully degradable ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/087C07C55/10C07D307/60B01J35/08B01J35/02B01J23/44
Inventor 刘全遥孙卫中邓兆敬马瑞丽
Owner CHINA CHEM TECH RES INST
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