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Method for separating methionine from mixed solution of methionine salt and carbonate by using bipolar membrane electrodialysis

A bipolar membrane electrodialysis and mixed solution technology, applied in sulfide preparation, organic chemistry, etc., can solve the problems of complex process, small output, complicated purification process, etc., and achieve the effect of easy operation, high recovery efficiency and high purity

Active Publication Date: 2014-07-16
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Chinese patents CN200610084263.0, CN201010150399.3 and CN20121045027.4 have improved the bio-enzyme resolution method. Although the above-mentioned patents have obtained methionine products, there are unavoidable disadvantages of small yield, complicated process and complicated purification process.
However, the process of using bipolar membranes to treat the mixture of methionine and carbonate has not been reported yet.

Method used

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  • Method for separating methionine from mixed solution of methionine salt and carbonate by using bipolar membrane electrodialysis
  • Method for separating methionine from mixed solution of methionine salt and carbonate by using bipolar membrane electrodialysis
  • Method for separating methionine from mixed solution of methionine salt and carbonate by using bipolar membrane electrodialysis

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Embodiment 1

[0036] The raw material used in this example is a mixed solution of sodium methionine and sodium carbonate, wherein the concentration of sodium methionine is 0.101 mol / L, and the concentration of sodium carbonate is 0.203 mol / L.

[0037] This embodiment utilizes bipolar membrane electrodialysis to separate methionine from the mixed solution of sodium methioninate and sodium carbonate according to the following steps:

[0038] Such as Figure 4 As shown, a bipolar membrane electrodialysis system (named membrane stack one in this embodiment) is set. The bipolar membrane electrodialysis system is composed of electrode chambers on both sides and a chamber sandwiched between the electrode chambers on both sides. It includes two chamber units, each chamber unit is composed of an alkali chamber, a feed liquid chamber and an acid chamber arranged in sequence, and a cation exchange membrane is used as the interval between the alkali chamber and the feed liquid chamber, and between the ...

Embodiment 2

[0049] The raw material used in this example is a mixed solution of sodium methionine and sodium carbonate, wherein the concentration of sodium methionine is 0.106 mol / L, and the concentration of sodium carbonate is 0.148 mol / L.

[0050] This embodiment utilizes bipolar membrane electrodialysis to separate methionine from the mixed solution of sodium methioninate and sodium carbonate according to the following steps:

[0051] Such as Figure 5 As shown, a bipolar membrane electrodialysis system (named membrane stack two in this embodiment) is set. The bipolar membrane electrodialysis system is composed of electrode chambers on both sides and a chamber sandwiched between the electrode chambers on both sides. It includes two chamber units, each chamber unit is composed of an alkali chamber and an acid chamber arranged in sequence. The alkali chamber of the chamber unit is separated by a bipolar membrane; the chamber unit adjacent to the electrode chambers on both sides is separ...

Embodiment 3

[0062] The raw material used in this example is a mixed solution of sodium methionine and sodium carbonate, wherein the concentration of sodium methionine is 0.096 mol / L, and the concentration of sodium carbonate is 0.158 mol / L.

[0063] This embodiment utilizes bipolar membrane electrodialysis to separate methionine from the mixed solution of sodium methioninate and sodium carbonate according to the following steps:

[0064] Such as Figure 6 As shown, a bipolar membrane electrodialysis system (named membrane stack three in this embodiment) is set. The bipolar membrane electrodialysis system is composed of electrode chambers on both sides and a chamber sandwiched between the electrode chambers on both sides. It includes two chamber units, each chamber unit is composed of an alkali chamber and an acid chamber arranged in sequence, the alkali chamber and the acid chamber are separated by a cation exchange membrane, the acid chamber of the first chamber unit and the next chamber...

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Abstract

The invention discloses a method for separating methionine from a mixed solution of methionine salt and carbonate by using bipolar membrane electrodialysis. The method is characterized by comprising the steps of arranging a bipolar membrane electrodialysis system, and separating methionine from a mixed solution of methionine salt and carbonate by using a bipolar membrane electrodialysis process, wherein a bipolar membrane is capable of simultaneously generating hydroxyl ions and hydrogen ions through hydrolytic dissociation, the hydrogen ions are capable of neutralizing methionine ions and carbanions in the mixed solution of methionine salt and carbonate to generate methionine, and the generated hydroxyl ions are capable of combining with positive ions to obtain inorganic base. According to the method, a large quantity of acid and alkaline are not required to be additionally introduced in the bipolar membrane electrodialysis process, the environment friendliness is achieved, the process cost is lowered, no inorganic salt waste residue is generated in the process, the recovery efficiency of methionine is high, and the purity is high, thus the generated wastewater is more easily treated.

Description

technical field [0001] The invention relates to a method for treating mixed solution of methionine salt and carbonate by using bipolar membrane electrodialysis, more specifically a bipolar membrane electrodialysis system for simultaneously producing methionine and inorganic alkali products. Background technique [0002] Methionine is a very important amino acid essential to the human body, which is widely used in the fields of medicine, cosmetics and food, especially feed additives. Different from other amino acids, methionine cannot be synthesized in animals and must be ingested from the outside world. Studies have shown that adding methionine to animal feed can promote the absorption of nutrients by animals, thereby promoting the rapid growth of animals, shortening the feeding cycle, and increasing lean mass. In addition, both D-type and L-type methionine can be absorbed by animals, so D, L-methionine prepared by chemical synthesis can be used as a feed additive without c...

Claims

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Application Information

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IPC IPC(8): C07C323/58C07C319/20
Inventor 徐铜文蒋晨啸汪耀明
Owner UNIV OF SCI & TECH OF CHINA
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