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Method for separation and extraction of glycollic acid and lactic acid in hydrothermal liquefied liquid by solvent extraction method

An extraction method and water extraction technology, which is applied in the field of separation and extraction of glycolic acid and lactic acid in hydrothermal liquefaction liquid, can solve the problems of complicated influence on lactic acid separation effect, hinder lactic acid fermentation, and cell toxicity, and achieve low production cost and reduce Dosage, the effect of reducing the content of impurities

Inactive Publication Date: 2016-03-02
CHINA FUEL HUAIBEI BIOENERGY TECH DEV +1
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  • Application Information

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Problems solved by technology

However, a small amount of organic matter remaining in the water phase is toxic to the cells and hinders the further fermentation of lactic acid, and its extraction rate is relatively low (about 75%). Various sugars and inorganic salts in the fermentation broth affect the separation effect of lactic acid. relatively complex

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take glycolic acid concentration is 90.07g / L, lactic acid concentration is 10mL of the hydrothermal liquefaction liquid of 169.12g / L, and 30mL trioctylphosphine oxide (molecular formula C 24 h 51 PO) was mixed and stirred for 5 minutes at a temperature of 25°C. After 13 stages of countercurrent extraction, the concentrations of glycolic acid and lactic acid in the raffinate were 7.3 g / L and 5.1 g / L, respectively, and the extraction rates reached 91.89% and 96.98%, respectively. The obtained loaded organic phase undergoes a 3-stage countercurrent washing process, the washing temperature is 25°C, the ratio is 20:1, the washing is stirred for 5 minutes, and the stirring speed is 500rpm. Impurities such as pigments, sugars, and proteins are washed down, and then the load after the washing process is extracted with double-distilled water. The ratio is 5:1, the temperature is 75°C, and the reaction is 5 minutes. After 8-stage countercurrent extraction, glycolic acid and lact...

Embodiment 2

[0024] Take 10mL of hydrothermal liquefaction solution with a glycolic acid concentration of 90.07g / L and a lactic acid concentration of 169.12g / L, mix it with 30mL trioctylphosphine oxide and stir for 10min at a temperature of 45°C. After 13 stages of countercurrent extraction, ethanol in the raffinate The concentrations of acid and lactic acid were 13.73g / L and 22.81g / L, respectively, and the extraction rates reached 84.76% and 86.51%, respectively. The obtained loaded organic phase undergoes a 3-stage countercurrent washing process, the washing temperature is 35°C, the ratio is 20:1, the washing is stirred for 15 minutes, and the stirring speed is 700rpm. Impurities are washed down, and then double-distilled water is used to reversely extract the loaded organic after the water washing process. The ratio is 3:1, the temperature is 65°C, and the reaction is 5 minutes. After 9 stages of countercurrent back extraction, the yield of glycolic acid and lactic acid reaches 95.84%. ...

Embodiment 3

[0026] Take 10 mL of hydrothermal liquefaction solution with glycolic acid concentration of 90.07 g / L and lactic acid concentration of 169.12 g / L, and 20 mL of trihexylphosphine oxide (molecular formula C 18 h 39 PO) was mixed and stirred for 5 minutes at a temperature of 25 °C. After 11 stages of countercurrent extraction, the concentrations of glycolic acid and lactic acid in the raffinate were 36.72 g / L and 58.39 g / L, respectively, and the extraction rates reached 59.23% and 65.47%, respectively. The obtained loaded organic phase undergoes a 2-stage countercurrent washing process, the washing temperature is 45°C, the ratio is 30:1, the washing is stirred for 5 minutes, and the stirring speed is 600rpm. The impurities were washed off, and then the loaded organic phase was extracted with double distilled water. The ratio was 5:1, the temperature was 75°C, and the reaction was 5 minutes. After 7 stages of countercurrent back extraction, the yields of glycolic acid and lactic a...

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Abstract

The invention provides a method for separation and extraction of glycollic acid and lactic acid in a hydrothermal liquefied liquid by a solvent extraction method, and the problem that glycollic acid and lactic acid cannot be selectively separated is solved. According to the method, multistage countercurrent extraction is carried out on hydroxycarboxylic acid in a hydrothermal liquefied liquid by the use of a phosphinic extractant or alcohol extractant; then, a loaded organic phase is washed by a countercurrent washing process; and finally, the washed loaded organic phase undergoes countercurrent back-extraction by the use of double distilled water or deionized water. Extraction rate is raised by the countercurrent extraction mode. By the optimal technology, extraction rate of glycollic acid and lactic acid can reach 90% and above. Yield of glycollic acid and lactic acid obtained by double distilled water back-extraction reaches up to 95% and above. The method has a simple process and is environmentally friendly. By the method, consumption of the extractant is low, use amount is stable, and the extractant is safe and nontoxic. Resources of the extraction process are comprehensively utilized.

Description

technical field [0001] The invention relates to the field of separation and extraction of glycolic acid and lactic acid in hydrothermal liquefaction liquid, in particular to a method for separating and extracting lactic acid and glycolic acid in hydrothermal liquefaction liquid by using phosphine extractant or alcohol extractant. Background technique [0002] Glycolic acid, also known as glycolic acid, is the simplest α-hydroxy acid. The main production methods are chloroacetic acid method, cyanidation hydrolysis method, fermentation method, etc. Chloroacetic acid method is suitable for large-scale production, but chloroacetic acid is highly toxic and corrosive, and the product obtained has low purity, which is not conducive to environmental protection. Cyanide hydrolysis is a method for producing high-purity glycolic acid. Since its raw material is a highly toxic substance, it has high requirements for product purification. Lactic acid, also known as 2-hydroxypropionic aci...

Claims

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Application Information

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IPC IPC(8): C07C59/08C07C59/06C07C51/48
CPCC07C51/48
Inventor 魏琦峰任秀莲苏春高陈泳兴郭敬敬章春青
Owner CHINA FUEL HUAIBEI BIOENERGY TECH DEV
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