Refining method of L-glutamic acid

A refining method and glutamic acid technology, applied in the refining field of L-glutamic acid, can solve the problems of high material cost, complex production process, large consumption of sodium hydroxide, etc., and achieve simple production process, product yield and purity. The effect of high and low equipment requirements

Inactive Publication Date: 2017-10-24
峨眉山市龙腾生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All three methods require continuous purification and refining. For most enterprises, the purchase of 98% gluten acid is used to refine food and pharmaceutical grade L-glutamic acid. However, the production process of 98% gluten acid to refine L-glutamic acid is complicated and requires Large amount of sodium hydroxide, higher material cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The refining method of a kind of L-glutamic acid described in the present embodiment, comprises the following steps:

[0032] (1) add solvent and heat in decolorizing tank, wherein solvent is the mother liquor of last production cycle step (2), add monosodium glutamate, the content of sodium glutamate in monosodium glutamate is more than 99%, and the weight ratio of monosodium glutamate and solvent is 1: 3. Stir evenly, and when the temperature rises to 75°C, add activated carbon with 0.2% MSG weight, heat and absorb for 30 minutes, and use a plate and frame filter to circulate and filter to obtain the decolorizing solution;

[0033] (2) The decolorization liquid described in step (1) is finely filtered with a microporous filter, sent into a neutralization tank, kept at 75° C., added with a concentration of 31% hydrochloric acid to adjust the pH to 3.2, and then cooled to 30° C. Crystallization below ℃, centrifugation after crystallization to obtain wet product and moth...

Embodiment 2

[0038] The refining method of a kind of L-glutamic acid described in the present embodiment, comprises the following steps:

[0039] (1) add solvent and heat in decolorizing tank, wherein solvent is the mother liquor of last production cycle step (2), add monosodium glutamate, the content of sodium glutamate in monosodium glutamate is more than 99%, and the weight ratio of monosodium glutamate and solvent is 1: 2. Stir evenly, and when the temperature rises to 70°C, add activated carbon with 0.1% of MSG weight, heat and absorb for 20 minutes, and use a plate and frame filter to circulate and filter to obtain a decolorizing solution;

[0040] (2) The decolorization solution described in step (1) is finely filtered with a microporous filter, sent into a neutralization tank, kept at 70° C., added with a concentration of 31% hydrochloric acid to adjust the pH to 3.0, and then cooled to 30° C. Crystallization below ℃, centrifugation after crystallization to obtain wet product and m...

Embodiment 3

[0045] The refining method of a kind of L-glutamic acid described in the present embodiment, comprises the following steps:

[0046](1) add solvent and heat in decolorizing tank, wherein solvent is the mother liquor of last production cycle step (2), add monosodium glutamate, the content of sodium glutamate in monosodium glutamate is more than 99%, and the weight ratio of monosodium glutamate and solvent is 1: 8. Stir evenly. When the temperature rises to 80°C, add activated carbon with 0.5% of the weight of monosodium glutamate. After 40 minutes of heat preservation and adsorption, use a plate and frame filter to circulate and filter to obtain a decolorizing solution;

[0047] (2) The decolorization liquid described in step (1) is finely filtered with a microporous filter, sent into a neutralization tank, kept at 80° C., added with a concentration of 31% hydrochloric acid to adjust the pH to 3.5, and then cooled to 30° C. Crystallization below ℃, centrifugation after crystall...

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Abstract

The invention discloses a refining method of L-glutamic acid. The method comprises the following steps of (1) adding a solvent to a bleaching tank, heating, adding aginomoto, stirring evenly, adding activated carbon when the temperature is raised to 70-80 DEG C, carrying out insulated adsorption and filtering to obtain a decolored solution; (2) carrying out precise filtration on the decolored solution obtained in the step (1), feeding the decolored solution into a neutralization tank, keeping the temperature at 70-80 DEG C, adjusting the pH to acidity, carrying out cooling crystallization and then centrifuging to obtain a wet product and a mother liquid; and (3) carrying out vacuum drying on the wet product obtained in the step (2), wherein the vacuum drying temperature is smaller than 80 DEG C; and then carrying out cooling and detecting to obtain the L-glutamic acid. The refining method is simple in production technology and low in equipment requirement, free of high-temperature and high-pressure requirements, mild in reaction condition, high in product yield and purity, low in emission of the mother liquid, the highest temperature in the production process is 70-80 DEG C, and large-scale continuous production is convenient to implement.

Description

technical field [0001] The invention relates to the technical field of amino acid production, in particular to a method for refining L-glutamic acid. Background technique [0002] Glutamic acid is the most productive amino acid in the world, and it can be used for skin and hair as a nutraceutical. The molecule contains two carboxyl groups. The chemical name is α-aminoglutaric acid. Glutamic acid is a colorless crystal with umami taste. It is slightly soluble in water but soluble in hydrochloric acid solution. The isoelectric point is 3.22. It exists in a large amount in cereal proteins, and the content in animal brains is also high; glutamic acid plays an important role in the protein metabolism process in organisms, and participates in many important chemical reactions in animals, plants and microorganisms. Glutamic acid (2-aminoglutaric acid) has a left-handed body, a right-handed body and a racemic body, and the left-handed body is L-glutamic acid. [0003] L-glutamic a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C227/40C07C227/42C07C229/24
CPCC07C227/40C07C227/42C07C229/24
Inventor 陈云
Owner 峨眉山市龙腾生物科技有限公司
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