Method for producing succinic acid

A technology of succinic acid and butyrolactone, which is applied in the preparation of carboxylic anhydrides and organic chemistry, can solve the problems of high reaction temperature and pressure, large waste liquid pollution, difficult reaction temperature, etc., achieve mild reaction conditions and enhance service life , the effect of reducing the requirement

Active Publication Date: 2012-01-11
CHINA PETROLEUM & CHEM CORP +1
View PDF11 Cites 25 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The succinic anhydride product produced by this method has a high chroma. Since the product is discharged in a molten state, the operation of the reaction process is dangerous, and the product needs to be decolorized and purified, and the energy consumption is high.
[0011] Most of the existing technologies have high reaction temperature and pressure, difficulty in controlling the reaction temperature, difficulty in separating the product from the solvent, easy generation of waste liquid pollution in the production process, unsuitable process conditions for continuous production, complex process, and poor product quality. one or more deficiencies

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The internal diameter is 25mm, and the continuous fixed-bed reactor that is 1.2m is high is loaded with 20mlPd / Cu / C (the weight content of Pd in ​​the catalyst is 5%, the weight content of Cu is 3%) catalyst, and the catalyst is diluted 3 times with quartz sand . A 15% mass concentration MA / GBL (maleic anhydride / γ-butyrolactone) solution was prepared and pumped into the reactor. The reaction conditions are: reaction temperature 75°C, hydrogen partial pressure 1.0MPa, hydrogen / maleic anhydride molar ratio 100, LHSV 2.0h -1 (Liquid hourly volume space velocity based on maleic anhydride γ-butyrolactone solution), continuous reaction for 300 hours, MA conversion rate of 100% through analysis, SA (succinic anhydride) selectivity of 96.6%, GBL selectivity of 3.4%. The product is hydrolyzed at 80°C by adding 30g of water, and then crystallized and separated at -10°C to obtain a white crystalline succinic acid product. The yield of succinic acid is 96.8%, and the purity is 97....

Embodiment 2

[0029] Inner diameter is 25mm, and high is 20mlPd / Cu / C (the weight content of Pd is 10%, the weight content of Cu is 1%) catalyst on the continuous fixed-bed reactor of 1.2m high, and catalyst is diluted 3 times with quartz sand. A 75% mass concentration MA / GBL solution was prepared and pumped into the reactor. The reaction conditions are: reaction temperature 90°C, hydrogen partial pressure 1.0MPa, hydrogen / maleic anhydride molar ratio 300, LHSV 1.0h -1 , continuous reaction for 300h, the analysis showed that the conversion rate of MA was 100%, the selectivity of SA was 97.6%, and the selectivity of GBL was 2.4%. The product is hydrolyzed at 80°C by adding 30g of water, and then crystallized and separated at -10°C to obtain a white crystalline succinic acid product. The yield of succinic acid is 96.2%, and the purity is 97.6%. GBL separates the water and recycles it.

Embodiment 3

[0031] Inner diameter is 25mm, and height is 20mlPd / Fe / C (the weight content of Pd is 4%, the weight content of Fe is 3%) catalyst on the continuous fixed-bed reactor of 1.2m high, and catalyst is diluted 3 times with quartz sand. A 50% mass concentration MA / GBL solution was prepared and pumped into the reactor. The reaction conditions are: reaction temperature 65°C, hydrogen partial pressure 1.5MPa, hydrogen / maleic anhydride molar ratio 400, LHSV 1.0h -1 , continuous reaction for 300h, the analysis showed that the conversion rate of MA was 100%, the selectivity of SA was 98.1%, and the selectivity of GBL was 1.9%. The product is hydrolyzed at 80°C by adding 30g of water, and then crystallized and separated at -10°C to obtain a white crystalline succinic acid product. The yield of succinic acid is 97.6%, and the purity is 98.8%. GBL separates the water and recycles it.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
densityaaaaaaaaaa
melting pointaaaaaaaaaa
boiling pointaaaaaaaaaa
Login to view more

Abstract

The invention discloses a method for producing succinic acid. The method comprises the following steps of: performing hydrogenation reaction by taking 5 to 90 weight percent of a maleic anhydride gamma-butyrolactone solution as a raw material at the reaction temperature of between 50 and 100 DEG C under the pressure of between 0.2 and 2 MPa in the presence of a hydrogenation catalyst, hydrolyzing a hydrogenation product, crystallizing and separating to obtain succinic acid. The method is can be operated flexibly; reaction conditions are mild and controllable; and products are easy to separate and have good quality.

Description

technical field [0001] The invention relates to a method for producing succinic acid, in particular to a method for producing succinic acid by hydrogenation and hydrolysis of maleic anhydride. Background technique [0002] Succinic acid, also known as succinic acid, is a common natural organic acid widely found in the human body, animals, plants and microorganisms. Molecular formula is C 4 h 6 o 4 , the molecular weight is 118.09, the shape is colorless triclinic crystal or monoclinic crystal, flammable, the density is 1.572g / cm 3 (25°C), melting point 188°C, boiling point 235°C, soluble in water, ethanol and ether, insoluble in carbon disulfide and carbon tetrachloride. The natural source of succinic acid is amber, which has been buried in the ground for a long time, from the resin of pines. [0003] The production methods of succinic acid are mainly biological fermentation method, maleic anhydride electroreduction method and chemical method. Chemical methods mainly i...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C07C55/10C07C51/087
Inventor 吕清林霍稳周李花伊刘野魏晓霞
Owner CHINA PETROLEUM & CHEM CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap