Glutamic acid extracting technique

An extraction process, glutamic acid technology, applied in the field of glutamic acid extraction process, can solve problems such as poor extraction rate of glutamic acid and product quality, high treatment cost, and large amount of acid and alkali, so as to achieve good product quality and reduce sewage The effect of processing costs and reducing production costs

Inactive Publication Date: 2008-10-29
MAIDAN BIOLOGICAL GROUP FUJIAN
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process has the disadvantages of large amount of wastewater, high treatment cost, and large amount of acid and alkali.
[0005]In addition, some foreign or domestic glutamic acid manufacturers adopt continuous isoelectric technology, that is, after the glutamic acid fermentation liquid is properly concentrated and controlled at about 40°C, crystallized Sulfuric acid is added to the isoelectric tank of this kind, and the pH value in the isoelectric tank is controlled to be maintained at about 3.2, and the temperature is 40°C for crystallization. The amount of waste water in this process is relatively small, but the extraction rate of glutamic acid and product quality are poor.

Method used

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  • Glutamic acid extracting technique

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Experimental program
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Effect test

Embodiment 1

[0031] 1. Heat the glutamic acid fermentation broth (containing 12% glutamic acid) with steam to 95°C for ultrafiltration (membrane molecular weight cut-off is 30,000 molecular weight, the same below), and remove bacteria and macromolecular proteins in the fermentation broth;

[0032] 2. Filter the fermented liquid after ultrafiltration with a nanofiltration system (membrane filtration with a molecular weight cut-off of 600) to remove small molecular proteins and pigments in the fermented liquid;

[0033] 3. Take 800 ml of glutamic acid fermentation broth (containing 11.6% glutamic acid) after ultrafiltration and nanofiltration, heat it to 95°C, add sulfuric acid to adjust the pH of the fermentation broth to 4.0, and then add it to the crystallization pot of the rotary evaporator , while adding 2g of glutamic acid as a seed crystal for evaporation and concentration, the temperature is controlled at 90-95°C during concentration;

[0034] 4. Concentrate until about 200ml of liqu...

Embodiment 2

[0039] 1. Heat 800 liters of glutamic acid fermentation broth (containing 10.2% glutamic acid) to 60°C, adjust the pH to 4.8 and perform ultrafiltration to remove bacteria and macromolecular proteins in the fermentation broth;

[0040] 2. Filter the fermented liquid after ultrafiltration with a nanofiltration system (membrane filtration system with a molecular weight cut-off of 1000) to remove small molecular proteins and pigments in the fermented liquid;

[0041] 3. Heat the fermented liquid after nanofiltration to 75°C, add sulfuric acid to adjust the pH of the fermented liquid to 3.0, then enter the crystallization pot, and add 2kg of glutamic acid as a seed crystal for evaporation and concentration, and control the temperature at 80-85°C during concentration;

[0042] 4. Concentrate until there are about 200 liters of liquid left in the evaporator, then evaporate about 75% of the water, discharge to the crystallization tank, slowly cool down to 40°C, and centrifuge to separ...

Embodiment 3

[0047] 1. Heat 800 liters of glutamic acid fermentation broth (containing 10.2% glutamic acid) to 80°C, adjust the pH to 4.8 and perform ultrafiltration to remove bacteria and macromolecular proteins in the fermentation broth;

[0048] 2. Filter the fermented liquid after ultrafiltration with a nanofiltration system (membrane filtration system with a molecular weight cut-off of 800) to remove small molecular proteins and pigments in the fermented liquid;

[0049]3. Heat the fermented liquid after nanofiltration to 85°C, add sulfuric acid to adjust the pH of the fermented liquid to 3.5, then enter the crystallization pot, add 2kg of glutamic acid as a seed crystal for evaporation and concentration, and control the temperature at 80-85°C during concentration;

[0050] 4. Concentrate until there are about 200 liters of liquid left in the evaporator, then evaporate about 75% of the water, discharge to the crystallization tank, slowly cool down to 40°C, and centrifuge to separate gl...

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Abstract

The invention discloses a glutamic acid extraction process, which comprises heating glutamic acid fermenting liquor, ultra-filtering, and filtering with a nano-filter system, heating the fermenting liquid, adjusting the pH value to 3.0-4.0 with sulfuric acid, concentrating by evaporation in a crystallizer pan; and discharging to a crystallization promoting tank when 50%-80% of water is evaporated off, slowly cooling to a temperature below 60 DEC C, and centrifugally separating glutamic acid. The glutamic acid extraction process has small usage amount of acid and alkali, less waste water amount, and higher extraction efficiency of the glutamic acid. The obtained glutamic acid is ensured that the product quality reaches the national standard.

Description

【Technical field】 [0001] The invention relates to a glutamic acid extraction process, which belongs to the field of amino acid production. 【Background technique】 [0002] Glutamic acid, its molecular formula is: OOCCH(NH2)CH2CH2COOH, also known as L-1-aminopropane-1,3-dicarboxylic acid, is a colorless crystal or crystalline powder, divided into α and β crystal forms, Usually the β type is more stable. Glutamic acid is one of the basic amino acids for nitrogen metabolism in living organisms, and it is of great significance in metabolism. L-glutamic acid is the main component of protein, and glutamate is ubiquitous in nature. A variety of foods and the human body contain glutamate, which is not only one of the structural amino acids of proteins or peptides, but also a free amino acid. The L-type amino acid is more delicious. [0003] Glutamic acid has a left-handed body, a right-handed body and a racemic body. L-body, that is, L-glutamic acid. L-glutamic acid is a scaly o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C229/24C07C227/40
Inventor 刘建明
Owner MAIDAN BIOLOGICAL GROUP FUJIAN
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