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Complexing extraction separation method of levulinic acid

A technology of levulinic acid and complexation, which is applied in the separation/purification of carboxylic acid compounds, chemical instruments and methods, preparation of organic compounds, etc., can solve problems such as low extraction rate of levulinic acid

Active Publication Date: 2018-04-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that there is a problem of low extraction rate of levulinic acid by single solvent extraction in the prior art, and a new complex extraction method for separating levulinic acid is provided. The method has high extraction rate of levulinic acid, Low production cost, green and environmental protection

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Tributyl phosphate is used as a complexing agent, ethyl acetate is used as a cosolvent, and toluene is used as a diluent. The mass ratio of complexing agent, co-solvent and diluent is 1:1:1 to prepare a complexing extractant, add 5% sodium chloride to dissolve and mix evenly, and under the condition of 25°C, the raw material hydrolyzate and complexing The combined extractants were mixed and shaken in a separatory funnel at a mass ratio of 1:1 and allowed to stand for one hour. After layering, the upper organic phase was taken for analysis. The calculated separation coefficient was 10.17, and the extraction rate of levulinic acid was 91.78%.

Embodiment 2

[0031] Tributyl phosphate is used as a complexing agent, n-octanol is used as a cosolvent, and toluene is used as a diluent. The mass ratio of complexing agent, co-solvent and diluent is 1:1:1 to prepare a complexing extractant, add 5% sodium chloride to dissolve and mix well. At a temperature of 25°C, mix and shake the raw material hydrolyzate and complex extractant in a separatory funnel at a mass ratio of 1:1 and let it stand for one hour. After the layers are separated, take the upper organic phase for analysis and calculate the separation The coefficient is 4.43, and the extraction rate of levulinic acid is 81.58%.

Embodiment 3

[0033] Tributyl phosphate is used as a complexing agent, 2-methyltetrahydrofuran is used as a cosolvent, and toluene is used as a diluent. The mass ratio of complexing agent, co-solvent and diluent is 1:1:1 to prepare a complexing extractant, add 5% sodium chloride to dissolve and mix well. At a temperature of 25°C, mix and shake the raw material hydrolyzate and complex extractant in a separatory funnel at a mass ratio of 1:1 and let it stand for one hour. After the layers are separated, take the upper organic phase for analysis and calculate the separation The coefficient is 9.51, and the extraction rate of levulinic acid is 90.49%.

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Abstract

The invention relates to a complexing extraction separation method of levulinic acid and mainly solves the problem of low extraction rate of levulinic acid with single solvents in the prior art. The method comprises the step of contacting a levulinic acid aqueous solution with a complexing extraction agent, wherein the complexing extraction agent is prepared from, in parts by weight, 1-100 parts of a complexing agent, 0-50 parts of a cosolvent, 0-50 parts of a diluent and 0.5-10 parts of inorganic salt. With the adoption of the technical scheme, the problem is better solved, and the method canbe applied to industrial production of separation and purification of levulinic acid.

Description

technical field [0001] The invention relates to a method for complex extraction and separation of levulinic acid. Background technique [0002] Levulinic acid is an important platform compound for biomass conversion, which can be used to produce high value-added chemicals through hydrogenation, oxidative dehydrogenation, esterification, etc., and is widely used. Levulinic acid is usually produced by hydrolysis of biomass raw materials. Hydrochloric acid or sulfuric acid is usually used as a catalyst in the hydrolysis process. Cellulose is decomposed into glucose monomers under acidic conditions, and then hydrolyzed to generate levulinic acid and formic acid. Because the concentration of levulinic acid in the hydrolyzate is low, and levulinic acid has a carboxylic acid hydrophilic group, and there is a certain amount of formic acid in the solution, both formic acid and levulinic acid are weak organic acids, so the separation is difficult. To obtain levulinic acid with higher...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/42C07C51/487C07C59/185
CPCC07C51/42C07C51/487C07C59/185
Inventor 王晓晨宋奇
Owner CHINA PETROLEUM & CHEM CORP