Extraction technology of glutamic acid recovered by combining crystal transformation and ion exchange

Abstract

The invention relates to an extraction technology of a glutamic acid recovered by combining crystal transformation and ion exchange, belonging to the technical field of food industry. The extraction technology comprises the following technical steps: using the fermentation liquor of the glutamic acid, and heating, evaporating and concentrating the fermentation liquor; cooling the fermentation liquor to 25-50 DEG C after the fermentation liquor is evaporated and concentrated so that the glutamic acid is crystallized and separated out in an alpha form; obtaining an alpha form glutamic acid crystal, a first isoelectric separation mother liquor and a secondary separation mother liquor; enabling the glutamic acid to be crystallized and separated out in a beta crystal form, calling crystal transformation; separating feed liquor to obtain a beta crystal form glutamic acid crystal after the crystal transformation; after the secondary separation mother liquor is concentrated, adding a sulphuricacid to hydrolyze the concentrated secondary separation mother liquor, separating to obtain hydrolysis liquid and solid filter residues, i.e. humus; returning the first isoelectric separation motherliquor to a continuous crystallizing tank, and then using the first isoelectric separation mother liquor as an acid for isoelectric crystallization. The invention achieves the total extraction yield of 97-98 percent, greatly enhances the crystallization purity, greatly reduces the consumption of the sulphuric acid and liquid ammonia, recovers the mycoprotein and thoroughly eliminates the pollutionof high-concentration waste water.

Description

technical field [0001] The invention belongs to the food industry technology, in particular to a glutamic acid extraction process combined with ion exchange recovery through crystal transformation. Background technique [0002] In the prior art, the current process of extracting glutamic acid from the fermentation broth usually adopts the following methods: one-step freezing isoelectric plus ion exchange recovery extraction process, concentrated continuous isoelectric crystallization plus crystallization process, closed loop extraction Technology (Chinese Patent Application No.: 96116404.2 A method for extracting glutamic acid from fermentation broth), concentration and continuous isoelectric crystallization plus the extraction process of crystallization plus bacterial protein recovery (Chinese Patent Application No.: 200710135413.0 combined with transcrystallization of glutamic acid acid extraction process). [0003] The extraction process of one-step freezing isoelectrici...

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Problems solved by technology

[0004] The advantage of the concentrated continuous isoelectric crystallization plus crystallization process is that the extracted glutamic acid is of good quality, there is no ion exchange recovery link, the consumption of sulfuric acid and liquid ammonia is reduced, and the high-concentration waste liquid is reduced by more than 60%, which reduces the pressure on environmental protection; the disadvantage is that the extraction The yield is low, generally only 88-90%, which is equivalent to the high consumption of resource-based primary raw materials, and the bacterial protein is not extracted, which wastes waste liquid resources

[0005] Closed loop extraction process (Chinese patent application number: 96116404.2 a method for extracting glutamic acid from fermentation broth) has the advantages of eliminating the ion exchange recovery link, reducing the consumption of sulfuric acid and liquid ammonia, and completely solving the problem of environmental pollution. Liquid closed circuit circulation, no impurity removal link, so that the glutamic acid crystals obtained have many impurities, heavy color and poor quality

[0006] The extraction process of concentrated continuous isoelectric crystallization plus crystallization plus bacterial protein recovery (Chinese patent application number: 200710135413.0 combined with glutamic acid extraction process of crystallization) only adds bacteria on the basis of concentrated continuous isoelectric crystallization plus crystallization process In the recovery of body protein, the product quality is good, the waste liquid resources are comprehensively utilized, and the bacterial protein is extracted, which meets the requirements of environmental protection, but the problem of low extraction yield is not solved, the resource-based primary raw material consumption is high, and the product production cost is high

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