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Method for extracting D-lactic acid from D-ammonium lactate fermentation liquor

A technology of fermented liquid and ammonium lactate, applied in chemical instruments and methods, separation/purification of carboxylic acid compounds, preparation of carboxylate, etc., can solve the problems of many unit operations, long process routes, and low product quality, and achieve automation The effect of high degree, strong continuity and high product quality

Inactive Publication Date: 2020-03-06
SINOPEC YANGZI PETROCHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the defects of long process route, many unit operations, serious pollution of waste liquid, high energy consumption, low recovery rate and low product quality in the existing technology of lactic acid extraction, the invention provides a kind of fermentation liquid derived from D-ammonium lactate Method for extracting D-lactic acid from

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The preparation method of D-ammonium lactate fermented liquid comprises the following steps of sequential connection:

[0039] (1) Plate culture: Bacillus BS1-5 was inoculated into the plate medium for anaerobic culture, the culture temperature was 30°C, and the culture time was 48 hours;

[0040] (2) Seed culture: inoculate the bacillus bacilli cultured on the plate in step (1) into the seed medium for anaerobic culture, the culture temperature is 30° C., and the culture time is 24 hours;

[0041] (3) Fermentation acid production: inoculate the seed culture liquid obtained in step (2) into the fermentation medium to carry out fermentation acid production, the inoculum size is 15%, the fermentation temperature is 30 ° C, and nitrogen is fed to maintain its anaerobic environment. The neutralizer controls the pH of the fermentation system at 6.0.

[0042] The composition of the plate medium is (g / L): 10 glucose, 1 yeast extract, 1 anhydrous sodium acetate, 0.1 anhydrous ...

Embodiment 2

[0047] The preparation method of D-ammonium lactate fermented liquid comprises the following steps of sequential connection:

[0048] (1) Plate culture: Inoculate Bacillus BS1-5 into plate medium for anaerobic culture, culture temperature is 45°C, culture time is 20h;

[0049] (2) Seed culture: Inoculate the bacillus bacilli cultured on the plate in step (1) into the seed medium for anaerobic culture, the culture temperature is 45° C., and the culture time is 12 hours;

[0050] (3) Fermentation acid production: inoculate the seed culture liquid obtained in step (2) into the fermentation medium to carry out fermentation acid production, the inoculum size is 3%, the fermentation temperature is 45°C, feed nitrogen to maintain its anaerobic environment, adopt The neutralizer controls the pH of the fermentation system at 7.0.

[0051] The composition of the plate medium is (g / L): 30 glucose, 3 yeast extract, 4 anhydrous sodium acetate, 0.4 anhydrous magnesium sulfate, 3 potassium di...

Embodiment 3

[0056] The preparation method of D-ammonium lactate fermented liquid comprises the following steps of sequential connection:

[0057] (1) Plate culture: inoculate Bacillus BS1-5 into plate medium for anaerobic culture, culture temperature is 37°C, culture time is 24h;

[0058] (2) Seed culture: Inoculate the bacillus bacilli cultivated on the plate in step (1) into the seed medium for anaerobic culture, the culture temperature is 37°C, and the culture time is 20h;

[0059] (3) Acid production by fermentation: Inoculate the seed culture solution obtained in step (2) into the fermentation medium to produce acid by fermentation, the inoculum size is 10%, the fermentation temperature is 37° C., and nitrogen is fed to maintain its anaerobic environment. The neutralizer controls the pH of the fermentation system at 6.5.

[0060] The composition of the plate medium is (g / L): 20% glucose, 20% yeast extract, 20% anhydrous sodium acetate, 0.3% anhydrous magnesium sulfate, 20% potassium...

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Abstract

The invention discloses a method for extracting D-lactic acid from D-ammonium lactate fermentation liquor. The method comprises the following steps linked in sequence: (1) carrying out microfiltrationon D-ammonium lactate fermentation liquor to obtain a microfiltered fermentation liquor; (2) carrying out ultrafiltration on the microfiltered fermentation liquor obtained in the step (1) to obtain ultrafiltered fermentation liquor; (3) carrying out nanofiltration on the ultrafiltered fermentation liquor obtained in the step (2) to obtain nanofiltered fermentation liquor; (4) decolorizing the nanofiltered fermentation liquor obtained in the step (3) to obtain decolorized liquor; (5) performing electrodialysis treatment on the decolorized liquor obtained in the step (4) to obtain lactic acid clear liquor; and (6) concentrating the lactic acid clear liquor obtained in the step (5) to obtain a D-lactic acid product. The lactic acid extraction method is simple and easy to operate, causes no waste liquor pollution, is low in energy consumption, high in recovery rate and high in product quality, causes no byproducts and increases the recycling rate of materials.

Description

technical field [0001] The invention relates to a method for extracting D-lactic acid from D-ammonium lactate fermentation broth, belonging to the field of D-lactic acid extraction. Background technique [0002] Lactic acid is one of the three major organic acids in the world, it can be widely used in food, medicine, chemical industry and agriculture and other fields. The special D-lactic acid can be widely used in the fields of medicine, chemical industry and agriculture. Polylactic acid synthesized with D-lactic acid as a monomer has become the most promising green environmental protection material in the 21st century due to its good biodegradability and other excellent use characteristics (such as transparency, thermoplasticity, product safety, etc.). In addition, herbicides such as "Puma" and "Weiba", which are made of high-purity D-lactic acid, are new types of low-toxicity pesticides, which can effectively kill weeds and insects and are economical and reliable. In th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/42C07C51/47C07C51/41C07C59/08
CPCC07C51/412C07C51/42C07C51/47C07C59/08
Inventor 方晓江刘经伟李泽壮杨爱武
Owner SINOPEC YANGZI PETROCHEM
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