System for continuously separating and purifying amino acid from water solution of amino acid containing alkaline metal salt

An alkali metal salt, separation and purification technology, applied in the direction of purification/separation/stabilization of organic compounds, organic chemistry, organic chemical methods, etc., can solve the problem of affecting the quality of amino acid products, peritectic phenomenon, and iminodicarboxylic acid imino acid Solve problems such as separation, achieve the effect of easy operation, avoid peritectic, and improve product quality

Active Publication Date: 2014-08-06
CHONGQING UNISPLENDOUR CHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantage of this method is that no matter using strong acidic cationic resin or weakly acidic cationic resin, the amino acid and the coexisting by-product iminodicarboxylic acid cannot be effectively separated, resulting in "peritectic phenomenon" and affecting amino acid products. quality

Method used

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  • System for continuously separating and purifying amino acid from water solution of amino acid containing alkaline metal salt
  • System for continuously separating and purifying amino acid from water solution of amino acid containing alkaline metal salt
  • System for continuously separating and purifying amino acid from water solution of amino acid containing alkaline metal salt

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Embodiment 1

[0036] Taking the continuous separation and purification of glycine from the aqueous solution of sodium glycinate as an example, the preferred embodiment scheme of the system of the present invention is described according to the first embodiment. For the schematic flow chart of the continuous separation and purification of glycine from the aqueous solution of sodium glycinate, see image 3 shown.

[0037] Sodium glycinate solution contains a lot of colored impurities, the color is dark brown, and its composition is as follows: about 12% sodium glycinate, about 2% sodium iminodiacetic acid, about 1% sodium hydroxide, about 0.2% sodium nitrilotriacetate and a small amount of NH 3 .

[0038] The above-mentioned sodium glycinate solution first uses 10% glycine solution to adjust the pH of the raw material to about 10-12, and then enters the decolorization tower 4 for decolorization treatment, and obtains a sodium glycinate clear liquid after decolorization. The sodium glycinate...

Embodiment 2

[0043] Taking the continuous separation and purification of glycine from the aqueous solution of sodium glycinate as an example, the preferred embodiment scheme of the system of the present invention is described according to the second embodiment. The schematic flow chart of the continuous separation and purification of glycine from the aqueous solution of sodium glycinate can be found in image 3 shown.

[0044] Sodium glycinate solution contains a lot of colored impurities, the color is dark brown, and its composition is as follows: about 12% sodium glycinate, about 2% sodium iminodiacetic acid, about 1% sodium hydroxide, about 0.2% sodium nitrilotriacetate and a small amount of NH 3 .

[0045] The above-mentioned sodium glycinate solution first uses 10% glycine solution to adjust the pH of the raw material to about 10-12, and then enters the decolorization tower 4 for decolorization treatment, and obtains a sodium glycinate clear liquid after decolorization. The sodium g...

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Abstract

The invention discloses a system for continuously separating and purifying amino acid from a water solution of amino acid containing alkaline metal salt. The system at least comprises the following sequentially-connected devices: a first-stage continuous ion exchange device for enabling the water solution of the amino acid containing alkaline metal salt to be subjected to continuous ion exchange reaction, an electrodialysis device for desalting a water solution of crude amino acid and a second-stage continuous ion exchange device for enabling a water solution of an iminodicarboxylate alkaline metal acidic salt to be subjected to continuous ion exchange reaction. The system is easy to operate and capable of avoiding generating a peritectic phenomenon, favorably realizing the separation of amino acid and iminodicarboxylate as a byproduct and improving the quality of an amino acid product.

Description

Technical field [0001] The present invention involves a system of continuous separation and purification of amino acids, especially the system that is separated from an amino acid alkaline metal salt. Background technique [0002] The preparation method of amino acids such as glycine, alanine, and eggine adopts Strecker method. In the StRCKER method, amino acids in the form of alkaline metal salt are obtained, such as glycamine hydrolyzed to obtain sodium glycine aquatic solution, and then the obtained amino acids obtainedThe alkaline metal salt water -solution dehydrated amino acid. [0003] At present, the separation and purification of amino acids (dehydration) is mostly a water solution of alkaline metal salt with acid and amino acids, and then recycled amino acids by crystallizing methods.For example, a Chinese patent CN1962611b reported a alkaline -containing alkaline -containing alkaline -containing alkaline -containing alkaline -containing alkaline -containing alkaline -c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07B63/00C07C227/40C07C227/18C07C229/08C07C229/16
Inventor 韦异勇徐洪覃玉芳耿明刚郑皓金海琴刘桢刘丹
Owner CHONGQING UNISPLENDOUR CHEM
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