Production process of glutamic acid and monosodium glutamate

Abstract

The invention discloses a production process of glutamic acid and monosodium glutamate, which comprises the following steps: firstly, evaporating and concentrating fermentation liquid; after concentrated sulfuric acid is added for isoelectric operation, cooling to 5-15 DEG C; obtaining an alpha-crystalline glutamic acid crystal suspension after primary separation, primary crystal washing, secondary separation and secondary crystal washing; regulating the pH value to be 4.0-5.0 at 80-90 DEG C, cooling to 35 DEG C, and obtaining a beta-crystalline glutamic acid crystal through filtration and separation, wherein the beta-crystalline glutamic acid crystal can be dried by air flow to obtain glutamic acid products, and the beta-crystalline glutamic acid crystal can be continuously neutralized and refined to obtain monosodium glutamate products; carrying out cyclone precipitation on primary mother liquid after primary separation, removing protein in supernatant liquid by flocculation air flotation process, and drying the protein to obtain bacterial protein powder; and carrying out ion exchange on the deproteinized clear liquid to prepare compound fertilizer. The extraction method of the glutamic acid provided by the invention fundamentally reduces the generation of waste water, improves the extraction yield and the product quality, reduces the amount of water for exchanging ions and washing columns to the minimum, and has higher production efficiency and lower production cost.

Description

technical field [0001] The invention relates to a production process of glutamic acid and monosodium glutamate. Background technique [0002] Monosodium glutamate is a safe seasoning food, which is indispensable in the consumer market. my country is a big producer and consumer of monosodium glutamate, with an annual output of more than 1.7 million tons of monosodium glutamate. The monosodium glutamate industry pays attention to sustainable development, and environmental protection issues have become the key to influence. [0003] Glutamic acid, also known as L-1-aminopropane-1,3-dicarboxylic acid, is divided into α and β crystal forms, and the β form is usually 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. Glutamic acid is mainly used to produce umami flavor agents such as monosodium glutamate and chicken essence. [0004] The production process of glutamic acid is mai...

AI Technical Summary

Problems solved by technology

The disadvantages of this process are: the volume of the liquid for ion exchange is huge, which greatly increases the consumption of sulfuric acid and ammonia water, and at the same time inevitably increases a large amount of waste water, the cost of raw materials and environmental protection is high, and the obtained glutamic acid impurities are of poor quality.

[0006] In addition, glutamic acid production adopts a continuous isoelectric process, that is, the glutamic acid fermentation liquid is properly concentrated and controlled at about 40°C, and is continuously added to the isoelectric tank with seed crystals, and sulfuric acid is added at the same time to control the pH value of the isoelectric tank. Around 3.2, the temperature is 40°C for crystallization, the waste water discharge of this process is relatively small, but the extraction rate of glutamic acid and product quality are poor

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