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Novel decoloration process for D-lactic acid

A new process, lactic acid technology, is applied in the new process field of D-lactic acid decolorization, which can solve the problems of poor quality of D-lactic acid decolorization

Active Publication Date: 2016-01-20
SHANDONG SHOUGUANG JUNENG GOLDEN CORN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Specifically, the technical problem to be solved by the present invention is to provide a new process for the production and decolorization of D-lactic acid to solve the technical problem that D-lactic acid needs to be decolorized multiple times and the quality of decolorization is very poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A kind of new technology of D-lactic acid production decolorization, comprises the steps:

[0035] (1) D-lactic acid producing bacteria are anaerobically fermented at 35°C. During the cultivation process, the pH is adjusted with 20wt% calcium hydroxide solution. After the cultivation is over, the fermentation broth is post-ripened, and the temperature is raised to 40°C, maintained for 10 hours, and air is intermittently introduced , so that the lactic acid producing bacteria are in a micro-aerobic state, and continue to consume nutrients that are prone to pigmentation, which is convenient for subsequent decolorization treatment;

[0036](2) After the post-ripening of D-lactic acid fermentation, adjust the pH of the fermentation broth to 11 by adding 40wt% calcium hydroxide solution, then quickly raise the temperature of the fermentation broth to 110°C within 2 minutes, and set the temperature at a pressure of 0.06mpa Keep the time for 20 minutes to allow the colored sub...

Embodiment 2

[0045] A kind of new technology of D-lactic acid production decolorization, comprises the steps:

[0046] (1) D-lactic acid producing bacteria are anaerobically fermented at 37°C. During the cultivation process, the pH is adjusted with 30wt% calcium hydroxide solution. After the cultivation is over, the fermentation broth is post-ripened, and the temperature is raised to 42.5°C, maintained for 15 hours, and air is intermittently introduced , so that the lactic acid producing bacteria are in a micro-aerobic state, and continue to consume nutrients that are prone to pigmentation, which is convenient for subsequent decolorization treatment;

[0047] (2) After the post-ripening of D-lactic acid fermentation, adjust the pH of the fermentation broth to 12 by adding 30wt% calcium hydroxide solution, then quickly raise the temperature of the fermentation broth to 125°C within 2 minutes, and set the temperature at a pressure of 0.10mpa Hold for 30 minutes to allow the colored substance...

Embodiment 3

[0056] A kind of new technology of D-lactic acid production decolorization, comprises the steps:

[0057] (1) D-lactic acid producing bacteria are anaerobically fermented at 40°C. During the cultivation process, the pH is adjusted with 40wt% calcium hydroxide solution. After the cultivation is over, the fermentation broth is post-ripened, and the temperature is raised to 50°C, maintained for 20 hours, and air is intermittently introduced , so that the lactic acid producing bacteria are in a micro-aerobic state, and continue to consume nutrients that are prone to pigmentation, which is convenient for subsequent decolorization treatment;

[0058] (2) After the post-ripening of D-lactic acid fermentation, adjust the pH of the fermentation broth to 13 by adding 40wt% calcium hydroxide solution, then quickly raise the temperature of the fermentation broth to 130°C within 3 minutes, and set the temperature at a pressure of 0.15mpa Keep the time for 40 minutes to allow the colored su...

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PUM

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Abstract

The invention relates to a novel decoloration process for D-lactic acid. The novel decoloration process is characterized by comprising the following steps: after the fermental cultivation of D-lactic acid is finished, heating, introducing air for afterripening, after the afterripening is finished, regulating the pH of D-lactic acid fermenting liquid by virtue of a calcium hydroxide solution, rapidly heating at a certain pressure, maintaining for a period of time, filtering, carrying out acidolysis by virtue of sulfuric acid, after colored matters are separated from acidolysis liquid at the high temperature and a certain pressure, carrying out activated carbon decoloration once, carrying out cation exchange and anion exchange to obtain lactic acid liquid, and finally concentrating the lactic acid liquid, so as to obtain the finished product. By virtue of the novel decoloration process, once decoloration is realized, the decoloration process is greatly simplified, the cost is saved, and meanwhile, the yield and the chromaticity of lactic acid are improved.

Description

technical field [0001] The invention relates to the technical field of lactic acid treatment, in particular to a new process for decolorizing D-lactic acid. Background technique [0002] Lactic acid, also known as α-hydroxypropionic acid, is divided into D-lactic acid and L-lactic acid because it contains an asymmetric carbon atom. Since the human body only has L-lactate dehydrogenase that metabolizes L-lactic acid, L-lactic acid is widely used as a food additive, while D-lactic acid, as an important chiral intermediate, has been used in the synthesis of various chiral substances . In recent years, D-lactic acid with high optical purity has attracted more attention because of its practical application in the properties of heated polylactic acid materials. D-lactic acid and its derivatives are precursors for the synthesis of various chiral substances, and are widely used in the fields of medicine, pesticide and chemical industry. Especially with the popularity and promotio...

Claims

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Application Information

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IPC IPC(8): C07C51/42C07C51/43C07C51/47C07C59/08C12P7/56
CPCC07C51/42C07C51/43C07C51/47C12P7/56C07C59/08
Inventor 王志强吴泽华孙敬善张杰卢滋
Owner SHANDONG SHOUGUANG JUNENG GOLDEN CORN CO LTD
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