Methionine separation and purification method

A technology for separation and purification of methionine, applied in chemical instruments and methods, organic chemistry, preparation of organic compounds, etc., can solve the problems of low methionine purity and poor treatment method of secondary methionine products, and achieves high single recovery rate, The effect of maximizing resource utilization and simple operation

Inactive Publication Date: 2018-11-13
NINGXIA UNISPLENDOUR TIANHUA METHIONINE CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a method for separation and purification of methionine, which is used to solve the problems in the prior art that the treatment method of the secondary product of methionine is not good, and the purity of the methionine obtained from the treatment is low.

Method used

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  • Methionine separation and purification method

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Embodiment 1

[0041] A method for separating and purifying methionine, comprising the steps of:

[0042] 1) Take 500g secondary methionine (by weight, methionine content is 35%, sodium sulfate content is 44%, moisture content is 15%, formate content is 5%, also contains a small amount of methionine dimer and unknown impurity) , added to 500ml of water, heated and kept at 35-40°C, then started to stir for 1 hour, and then carried out suction filtration to obtain crude methionine and 650ml of filtrate respectively. Adjust the pH of the filtrate to about 5.5, and the filtrate was desalted by continuous chromatography. The separation temperature is 40°C, and deionized water is used as the mobile phase to obtain 950ml of extract (methionine aqueous solution) and 1200ml of raffinate (salt solution), wherein the extract is recycled to step 2) as water for recrystallization of crude methionine, and the raffinate After concentration, cooling and crystallization in sodium sulfate.

[0043] 2) Add th...

Embodiment 2

[0046] A method for separating and purifying methionine, comprising the steps of:

[0047]1) Take 500g secondary methionine (by weight, methionine content is 35%, sodium sulfate content is 44%, moisture content is 15%, formate content is 5%, also contains a small amount of methionine dimer and unknown impurities) , added to 500ml of water, heated and kept at 35-40°C, then turned on and stirred for 1 hour, and then subjected to suction filtration to obtain crude methionine and 650ml of filtrate respectively, and the pH of the filtrate was adjusted to about 5.5, and the filtrate was desalted by homogeneous membrane electrodialysis Treatment, the desalination temperature is 35°C, 610ml of methionine aqueous solution and 650ml of saline solution are obtained respectively, wherein the methionine aqueous solution is recycled to step 2) as water for recrystallization of crude methionine, and the saline solution is concentrated, cooled and crystallized to obtain sodium sulfate.

[004...

Embodiment 3

[0051] A method for separating and purifying methionine, comprising the steps of:

[0052] 1) Take 500g secondary methionine (by weight, methionine content is 35%, sodium sulfate content is 44%, moisture content is 15%, formate content is 5%, also contains a small amount of methionine dimer and unknown impurities) , added to 500ml of water, heated and kept at 35-40°C, then turned on and stirred for 1 hour, and then suction filtered to obtain crude methionine and 650mL of filtrate, and the pH of the filtrate was adjusted to about 5.5, and the filtrate was desalted by continuous chromatography and separated by chromatography The temperature is 40°C, and deionized water is used as the mobile phase to obtain 950ml of extract (methionine aqueous solution) and 1200ml of raffinate (saline solution), wherein the extract is recycled to step 2) as water for recrystallization of crude methionine, and the raffinate is passed through Concentrate, cool and crystallize to obtain sodium sulfa...

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Abstract

The invention provides a methionine separation and purification method. The method at least includes following steps: 1), adding water to salt-containing methionine for salt-leaching treatment, and performing solid-liquid separation to obtain solid which is a methionine crude product; 2), adding water to the methionine crude product obtained in the step 1), recrystallizing, and performing solid-liquid separation to obtain solid which is a methionine finished product. The method can save energy consumption and simple to operate; purity of the methionine product obtained by the method reaches higher than 99.0%, and resource utilization is maximized truly.

Description

technical field [0001] The invention relates to the technical field of methionine production, in particular to a method for separating and purifying methionine. Background technique [0002] At present, the solid residue containing methionine, sodium sulfate and other impurities produced by methionine production enterprises not only pollutes the environment and wastes costs, but also is difficult to recycle and process, which brings considerable losses to the enterprise. Methionine with impurities such as salt and ammonium sulfate, referred to as secondary methionine. Because it has the following characteristics: ① complex and unstable composition: by weight, the content of methionine is 20%-60%; the content of sodium sulfate is 20%-60%; the mass percentage of water is 10%-20% , the mass percentage of formate is 1%-6%, the mass percentage of ammonium sulfate is 0.5%-2%, the mass percentage of polymer is about 1%, and sometimes even contains resin and sediment; ②The color i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C323/58C07C319/28
Inventor 张建成吴传隆武永堂张静张剑李喜玲杨勇刘帮林廖长福屈晓磊张英杰周蕾秦岭
Owner NINGXIA UNISPLENDOUR TIANHUA METHIONINE CO LTD
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