Method for extracting lactic acid from fermentation liquor through combination of molecular distillation and extraction

A technology of molecular distillation and fermented liquid, which is applied in chemical instruments and methods, preparation of organic compounds, preparation of carboxylate, etc., to achieve the effects of saving resources, strong extraction ability and reducing emissions

Active Publication Date: 2017-02-22
NINGBO UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the above process, the content of lactic acid in the residual liquid of molecular distillation is as high as 20%~30%. From the perspective of saving resources and reducing emissions, it is necessary to recover lactic acid from the residual liquid of the tower

Method used

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  • Method for extracting lactic acid from fermentation liquor through combination of molecular distillation and extraction

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The sterilized fermented liquid is filtered to remove solid impurities to obtain a filtrate; the filtrate is subjected to vacuum distillation to remove low boilers and part of the water to obtain a concentrated liquid, and the mass fraction of lactic acid in the concentrated liquid is 50%; the concentrated liquid is subjected to molecular distillation to obtain refined lactic acid and Molecular distillation tower residue; the mass ratio of isopropyl ether and isopropyl acetate is a mixture of 1:1 as the No. 1 extractant, and the molecular distillation tower residue is extracted for the first time using No. 1 extractant. The volume ratio of extractant and molecular distillation tower still raffinate is 5:1, obtains upper phase and lower phase, and upper phase is the extraction phase for the first time, and lower phase is the raffinate phase for the first time; pressure distillation to obtain the overhead distillate and the residual liquid in the atmospheric distillation t...

Embodiment 2

[0015] The sterilized fermentation broth is filtered to remove solid impurities to obtain a filtrate; the filtrate is subjected to vacuum distillation to remove low boilers and part of the water to obtain a concentrated solution, and the mass fraction of lactic acid in the concentrated solution is 70%; the concentrated solution is subjected to molecular distillation to obtain refined lactic acid and Molecular distillation tower residue; the mass ratio of isopropyl ether and isopropyl acetate is a mixture of 5:1 as the No. 1 extractant, using No. 1 extractant to extract the molecular distillation tower residue for the first time, No. 1 The volume ratio of extractant and molecular distillation column bottom liquid is 10:1, and upper phase and lower phase are obtained, and upper phase is exactly the extraction phase for the first time, and lower phase is the raffinate phase for the first time; pressure distillation to obtain the overhead distillate and the residual liquid in the a...

Embodiment 3

[0017] The sterilized fermented liquid is filtered to remove solid impurities to obtain a filtrate; the filtrate is subjected to vacuum distillation to remove low boilers and part of the water to obtain a concentrated liquid, and the mass fraction of lactic acid in the concentrated liquid is 60%; the concentrated liquid is subjected to molecular distillation to obtain refined lactic acid and Molecular distillation tower residue; the mass ratio of isopropyl ether and isopropyl acetate is a mixture of 3:1 as the No. 1 extractant, using No. 1 extractant to extract the molecular distillation tower residue for the first time, No. 1 The volume ratio of extractant to molecular distillation tower still raffinate is 8:1, and upper phase and lower phase are obtained, and upper phase is the extraction phase for the first time, and lower phase is the raffinate phase for the first time; pressure distillation to obtain the overhead distillate and the residual liquid in the atmospheric distil...

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Abstract

The invention aims to solve the problem of high lactic acid content in residual liquid in a tower kettle according to a molecular distillation method for extracting lactic acid. The extraction is introduced into the molecular distillation method, a mixture of isopropyl ether and isopropyl acetate is taken as a No.1 extraction agent for extracting for the first time and recycling the lactic acid from the residual liquid in the tower kettle, and the rough lactic acid acquired after the extraction agent is recycled is returned into a molecular distillation device, so that the efficiency of recycling the lactic acid according to the molecular distillation method can be increased; and a mixture of tributyl phosphate, n-caprylic alcohol and hydrogenated kerosene is taken as a No.2 extraction agent for extracting for the second time, lime milk is adopted for carrying out reverse extraction so as to acquire calcium lactate emulsion, and the calcium lactate emulsion can be used for further preparing the lactic acid. The purity of the lactic acid acquired according to the method is above 95%, the recovery rate of the lactic acid (excluding the lactic acid recycled from the calcium lactate emulsion) is above 83%, and the method has the advantage of high recovery rate.

Description

technical field [0001] The invention belongs to the technical field of fermentative production of lactic acid, and in particular relates to a method for extracting lactic acid in fermented liquid in combination with molecular distillation. Background technique [0002] Lactic acid (α-hydroxypropionic acid) is an important organic acid that has been widely used in the food, pharmaceutical and chemical industries. The industrial production of lactic acid mainly includes fermentation and chemical synthesis. Due to the serious pollution of chemical synthesis, it is rarely used. At present, the fermentation method is generally used. The technology of separating and purifying lactic acid in lactic acid fermentation broth has a direct impact on the quality and yield of the product. Methods for extracting lactic acid from fermentation broth include calcium hydrochloride acid hydrolysis, solvent extraction, ion exchange, membrane separation, molecular distillation, etc. Among them, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/48C07C51/44C07C51/41C07C59/08
CPCC07C51/412C07C51/44C07C51/48C07C59/08
Inventor 沈剑谢瑶
Owner NINGBO UNIVERSITY OF TECHNOLOGY
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