Method of using methionine mother liquid containing potassium carbonate or potassium hydrogen carbonate to prepare zinc methionine zinc chelate

A technology of potassium bicarbonate and zinc methionine, which is applied in the chemical industry, can solve problems such as limited recovery, high cost, and complicated process, and achieve the effects of high added value, high recovery rate, and high product purity

Active Publication Date: 2019-03-19
LUFENG TIANBAO PHOSPHORUS CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] (1) Direct extraction of part of the methionine crystallization mother liquor causes waste of resources and pressure on environmental protection;
[0011] (2) The recovery of methionine and potassium salts is limited by secondary crystallization of the extracted mother liquor directly or by introducing lower alcohols;
[0012] (3) Through the...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Take 5.3Kg of methionine crystallization mother liquor containing potassium bicarbonate, analyze that the total methionine is 7.8wt% (of which methionine dipeptide is 0.6wt%), and the potassium ion concentration is 9.4wt%. Concentrate the mother liquor under reduced pressure at 70~100°C When the total methionine is 10~15wt%, the total methionine is 14.6wt% (0.8wt% of which is methionine dipeptide). Desalination, when the pH of the light-phase methionine crystallization mother liquor drops to pH=5~8, when the molar ratio of total methionine and potassium ions in the mother liquor is detected to be 1:0.8~1.1, transfer the light-phase mother liquor, add 416.7g of zinc sulfate heptahydrate, and heat Heat the reaction at 70-90°C for 30-90min. After the reaction, cool down and precipitate a large amount of white solids. Filter under reduced pressure at 25°C and dry the solids to obtain 517.3g of white methionine chelated zinc, with a main content of 99.5%, zinc content: 15.9%,...

Embodiment 2

[0042] Get 3.8Kg of methionine crystallization mother liquor containing potassium bicarbonate or potassium carbonate, analyze wherein total methionine is 8.6wt% (wherein methionine dipeptide 0.4wt%), potassium ion concentration is 9.1wt%. This mother liquor is concentrated to total The methionine is 10-15wt%, and the total methionine is 15.5wt% (0.6wt% of which is methionine dipeptide). When the pH of the light-phase methionine crystallization mother liquor drops to pH=6~8, track and detect when the molar ratio of total methionine to sodium ions in the mother liquor is 1:1~1.2, transfer the light-phase mother liquor, add 110g of zinc hydroxide, and heat to 70~ Heat the reaction at 90°C for 30~90min. After the reaction, the temperature is lowered and a large amount of white solid is precipitated. At 25°C, the solid is vacuum filtered and dried to obtain 411.2g of white methionine chelated zinc, with a main content of 99.7%, zinc content: 15.8%, and methionine recovery rate: 92.5...

Embodiment 3

[0045] Get 4.0Kg of methionine crystallization mother liquor containing potassium carbonate or potassium bicarbonate, analyze wherein total methionine is 7.6wt% (wherein methionine dipeptide 0.6wt%), potassium ion concentration is 9.8wt%, this mother liquor is added at 0.5~1.5MPa Concentrate under high pressure until the total methionine is 10~15wt%, and the total methionine is 14.8wt% (including 0.5wt% methionine dipeptide). Acidification and desalination, when the pH of the light-phase methionine crystallization mother liquor drops to pH=6~8, when the molar ratio of total methionine and sodium ions in the mother liquor is detected to be 1:0.8~1.1, transfer the light-phase mother liquor and add 292.8g of zinc sulfate heptahydrate , heated to 70-90°C and held for 30-90 minutes, after the reaction, the temperature was lowered to precipitate a large amount of white solid, and the solid was filtered under reduced pressure at 25°C and dried to obtain 386.8g of white methionine chel...

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PUM

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Abstract

The invention discloses a method of using methionine mother liquid containing potassium carbonate or potassium hydrogen carbonate to prepare methionine zinc chelate. The method includes following steps: concentrating methionine crystallization mother liquid to increase content of total methionine (containing methionine dipeptide) of a system to 8-15wt%, and promoting potassium hydrogen carbonate to be converted into potassium carbonate; transferring concentrated mother liquid for bipolar film electrodialysis for further acidifying and recycling potassium ions, desalting until a molar ratio ofmethionine to potassium ions in acid chamber mother liquid is 1:0.8-1.1, adding zinc salt of 0.5 molar total methionine equivalent weight, allowing reaction at 70-90 DEG C for 70-90min, cooling, crystallizing, separating, and drying to the methionine zinc chelate. The method is simple, practical and high in methionine and potassium ion recycling rate; physical property that the methionine zinc chelate is insoluble in water is utilized to realize separation of methionine from water-soluble impurities in the mother liquid, and the methionine zinc chelate which is a feed-grade trace element nutritional agent having high economic value.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for preparing zinc methionine chelate from methionine mother liquor containing potassium carbonate or potassium bicarbonate. Background technique [0002] D, L-methionine, also known as methionine, is an important biological nutrient and pharmaceutical and chemical raw material. As an essential amino acid for the human body and the first limiting amino acid for animals, it cannot be synthesized by the organism itself and must be ingested from food. [0003] The industrial production of D,L-methionine is still dominated by chemical synthesis. The chemical synthesis method uses cyanide, methyl mercaptan, acrolein, carbon dioxide, ammonia and other raw materials to synthesize 5-(2-methylthioethyl)hydantoin (referred to as hydantoin) through a series of reactions. Under the action of alkaline substances such as potassium hydroxide and potassium carbonate, it is h...

Claims

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Application Information

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IPC IPC(8): C07C319/20C07C323/58A23K20/142A23K20/20
CPCA23K20/142A23K20/30C07C319/20C07C323/58
Inventor 周荣超廖常福彭启明
Owner LUFENG TIANBAO PHOSPHORUS CHEM CO LTD
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