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Method for recovering lactic acid from base solution of lactic acid distillation kettle

A still, lactic acid technology, applied in the separation/purification of carboxylic acid compounds, preparation of carboxylate/lactone, organic chemistry, etc., can solve the problems of difficult high optical purity, limited distillation rate, etc. line, achieve the effect of extraction and recovery, and reduce aggregation

Pending Publication Date: 2021-08-06
安徽丰原生物技术股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The lactic acid industry is currently a hot research topic at home and abroad. The fermentation process of lactic acid has basically passed the test, and its extraction technology has also made some breakthroughs. However, the main problem is that it is difficult to obtain products with high optical purity in the later stage of the fermentation broth.
The use of distillation to extract lactic acid in industrial production can effectively extract high-purity lactic acid, but there is a limited distillation rate, which will produce more lactic acid still bottoms

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] This example provides a method for recovering lactic acid from the bottom liquid of lactic acid distillation.

[0036] (1) Weigh 22.69kg of lactic acid distillation bottom liquid (lactic acid content: 62.83wt%, total sugar: 10.76wt%), add 48.50kg of pure water, and hydrolyze for 24h at a temperature of 95°C and a stirring speed of 200rpm to obtain 71.18kg of lactic acid-containing hydrolyzate (lactic acid content: 20.03wt%, total sugar: 3.43wt%);

[0037] (2) Take powdered charcoal by weighing 0.5% of the mass of the lactic acid-containing hydrolyzate and add it to the lactic acid hydrolyzate, stir for 1 h at a temperature of 60° C., then use a Buchner funnel to carry out suction filtration to obtain 71.03 kg of lactic acid-containing decolorizing solution (lactic acid content: 20.03wt%, total sugar: 3.43wt%);

[0038] (3) Pass the lactic acid-containing decolorizing solution through the cation exchange column and the anion exchange column successively at a flow rate of ...

Embodiment 2

[0042] This example provides a method for recovering lactic acid from the bottom liquid of lactic acid distillation.

[0043] (1) Weigh 23.54kg of lactic acid distillation still bottom liquid (lactic acid content: 62.83wt%, total sugar: 10.76wt%), add 50.41kg of pure water, and hydrolyze for 24 hours at a temperature of 95°C and a stirring speed of 200rpm, Obtain 73.93kg of lactic acid-containing hydrolyzate (lactic acid content: 20.00wt%, total sugar: 3.42wt%);

[0044] (2) Take powdered charcoal by weighing 0.4% of the mass of the lactic acid-containing hydrolyzate and add it to the lactic acid hydrolyzate, stir for 1 h at a temperature of 60° C., then use a Buchner funnel to carry out suction filtration to obtain 73.74 kg of lactic acid-containing decolorizing solution (lactic acid content: 19.98wt%, total sugar: 3.41wt%);

[0045] (3) Pass the lactic acid-containing decolorizing solution through the cation exchange column and the anion exchange column successively at a fl...

Embodiment 3

[0049] This example provides a method for recovering lactic acid from the bottom liquid of lactic acid distillation.

[0050] (1) Weigh 40.50kg of lactic acid distillation bottom liquid (lactic acid content: 62.83wt%, total sugar: 10.76wt%), add 86.73kg of pure water, and hydrolyze it for 24h at a temperature of 95°C and a stirring speed of 200rpm, Obtain 127.20kg of lactic acid-containing hydrolyzate (lactic acid content: 20.00wt%, total sugar: 3.42wt%);

[0051] (2) Take powdered charcoal by weighing 0.3% of the mass of the lactic acid-containing hydrolyzate and add it to the lactic acid hydrolyzate, stir for 1 h at a temperature of 60° C., then use a Buchner funnel to carry out suction filtration to obtain 126.95 kg of lactic acid-containing decolorizing solution (lactic acid content: 19.96wt%, total sugar: 3.41wt%);

[0052] (3) 126.72 kg of lactic acid decolorization solution is filtered with a membrane with a molecular weight cut-off of 200D to 500D. When the lactic aci...

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Abstract

The invention provides a method for recovering lactic acid from a lactic acid distillation kettle base solution, which comprises the following steps: (1) mixing the lactic acid distillation kettle base solution with water, diluting and hydrolyzing to obtain hydrolysate containing lactic acid; and (2) carrying out decoloration filtration and membrane filtration on the hydrolysate containing lactic acid to obtain filtered clear liquid containing lactic acid, and then concentrating and distilling to obtain the lactic acid. The method for recovering lactic acid provided by the invention can effectively remove impurities in the kettle bottom solution, reduce polymerization of lactic acid, effectively realize extraction and recovery of the lactic acid distillation kettle bottom solution and further improve the yield of lactic acid, and the method provided by the invention is simple and easy to operate and can be applied to industrial production.

Description

technical field [0001] The invention belongs to the technical field of food chemical industry and relates to a method for recovering lactic acid from the bottom liquid of lactic acid distillation. Background technique [0002] Lactic acid, the English name is Lactic Acid, the chemical name is α-hydroxypropionic acid, and its molecular formula is C 2 h 5 OCOOH, with a relative molecular mass of 90.08, is a simple hydroxy acid. It widely exists in the human body, animals, plants and microorganisms. There is an asymmetric carbon atom in the lactic acid molecule, so it has optical activity. L-lactic acid is dextrorotatory, D-lactic acid is levorotatory, and DL-lactic acid is racemic. As one of the world's three major organic acids, lactic acid is widely used in brewing, medicine, food, cigarettes, leather and other industrial fields. The lactic acid industry is currently a hot research topic at home and abroad. The fermentation process of lactic acid has basically passed th...

Claims

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Application Information

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IPC IPC(8): C07C59/08C07C51/09C07C51/42C07C51/44C07C51/47
CPCC07C51/09C07C51/42C07C51/44C07C51/47C07C59/08
Inventor 李荣杰宋家林潘声龙胡富贵李瑞瑞缪庆卫王舒
Owner 安徽丰原生物技术股份有限公司
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