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Method for concentration of lactic acid in fermentation liquor

A fermented liquid and lactic acid technology, which is applied in the separation/purification of carboxylic acid compounds, can solve the problems of many steps, low lactic acid efficiency, and high cost, and achieve the effects of increased productivity, low volatility, and mild working conditions

Inactive Publication Date: 2008-05-07
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the problems of low extraction efficiency, high cost, difficult separation, and many method steps in the extraction of lactic acid in the existing lactic acid fermentation process, and proposes to enrich the lactic acid in the fermentation broth by polymer / salt two-phase system Methods

Method used

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  • Method for concentration of lactic acid in fermentation liquor
  • Method for concentration of lactic acid in fermentation liquor

Examples

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Embodiment 1

[0023] (1) Take 5 mL of an aqueous solution with a lactic acid concentration of 20,000 ug / mL, add 1.25 g of polyethylene glycol 4000 to each, stir to dissolve completely, and form a homogeneous system.

[0024] (2) Add 0.5g, 1.0g, 1.5g, 2.0g, 2.5g, 3.0g of different masses of K to the above homogeneous system 2 HPO 4 ·3H 2 O, stir to completely dissolve the inorganic salt and form a two-phase aqueous system. Stand still and separate the phases, and the lactic acid in the aqueous solution is enriched in the polyethylene glycol-rich phase.

[0025] (3) Two phases are separated, the polyethylene glycol-rich phase is separated from lactic acid by distillation, and the polyethylene glycol and salt recovered can be recycled, and the lower salt-rich phase can be recycled in the fermentation process.

[0026] The distribution ratio of lactic acid was calculated according to the above formula 1, and the result is shown in FIG. 1 .

Embodiment 2

[0028] The method of Example 1 was followed, but the added salt was ammonium sulfate. The distribution ratio of lactic acid was calculated according to the above formula 1, and the result is shown in FIG. 2 .

Embodiment 3

[0030] According to the method of embodiment 1, but the salt that adds is sodium sulfate. The distribution ratio of lactic acid was calculated according to the above formula 1, and the result is shown in FIG. 3 .

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Abstract

The invention relates to a method for collecting lactic acid from zymotic fluid, and comprises the steps as follows: the proper double aqueous phase system is selected to adjust the distribution of the lactic acid and the lactobacillus in the double aqueous phase system, the lactic acid is distributed at a polymer-rich phase, and the lactobacillus is distributed at a salt-rich phase to achieve the lactic acid collecting. The selected double aqueous phase system is a neutral extracting system close to the PH valve of 5.5 to 6.0 required by zymolysis of the lactic acid, the finished product is separated from the reacting matters. The phase separation provides a reaction power for the zymolysis of the lactic acid, so that the invention is beneficial to improve the productivity of the lactic acid. Moreover, the method disclosed in the invention can be coupled with the zymotic method of the lactic acid to reform the prior separating method of the lactic acid.

Description

technical field [0001] The invention relates to a method for enriching lactic acid in fermentation broth. Background technique [0002] Lactic acid is one of the three most widely used organic acids in the world, also known as propionic acid. Lactic acid is mainly used in food, medicine, medicine, light industry, chemical industry and other industries. Using lactic acid as raw material, a series of lactic acid derivatives with important uses can be obtained. In recent years, with the increasing shortage of resources and people's increasing attention to environmental protection issues, polylactic acid, a degradable polymer synthesized from lactic acid, has attracted widespread attention from researchers around the world. At present, the mainstream method of synthesizing lactic acid is fermentation. The extraction and refinement of lactic acid is an important step in the production of finished lactic acid from crude products. In the lactic acid fermentation method, the cost ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C59/08C07C51/47
Inventor 陈继邓岳锋张冬丽
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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