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Glycine production technology

A production process, glycine technology, applied in the field of glycine, can solve the problems of high energy consumption, low purity, low one-time yield, etc., and achieve the effect of low energy consumption, high purity, and high yield

Inactive Publication Date: 2017-05-24
QINGDAO SENMEIKE CHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is based on the traditional ammonolysis method of chloroacetic acid and adopts electrodialysis technology to clean the preparation process. Compared with the traditional process, it has the advantages of good quality, but its disadvantages are low purity, low one-time yield and high energy consumption.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Step 1: 20kg of glycine crude product containing glycine and inorganic salt produced by chloroacetic acid ammonolysis method is dissolved with deionized water to be mixed with 100kg of mixed solution, and its mass concentration is 20%; and the mass fraction of glycine in the glycine crude product is 54%, The mass fraction of ammonium chloride is 45%, and the rest are impurities; the pH of the mixed solution is adjusted and controlled by ammonia water to be 5.5-7 for the pH of the glycine solution;

[0019] Step 2: The above-mentioned mixed solution is filtered with a ceramic membrane with a filter aperture of 50 nanometers to obtain a ceramic membrane dialysate; during the ceramic membrane filtration process, the pH of the mixed solution is adjusted and controlled by ammonia water so that the pH of the glycine solution is 5.5-7;

[0020] Step 3: The ceramic membrane dialysate is separated by a continuous chromatographic separation system filled with ammonium resin to obt...

Embodiment 2

[0024] Step 1: 50kg of glycine crude product containing glycine and inorganic salt produced by chloroacetic acid ammonolysis method is dissolved with deionized water to be mixed with 100kg of mixed solution, and its mass concentration is 50%; and the mass fraction of glycine in the glycine crude product is 59%, The mass fraction of ammonium chloride is 40%, and the rest are impurities; the pH of the mixed solution is adjusted and controlled by ammonia water to be 5.5-7 for the pH of the glycine solution;

[0025] Step 2: filter the above-mentioned mixed solution with a ceramic membrane with a filter aperture of 100 nanometers to obtain a ceramic membrane dialysate; adjust and control the pH of the mixed solution by ammonia water during the ceramic membrane filtration process, so that the pH of the glycine solution is 5.5-7;

[0026] Step 3: The ceramic membrane dialysate is separated by a continuous chromatographic separation system filled with calcium-type resin to obtain glyc...

Embodiment 3

[0029] Step 1: 30kg of glycine crude product containing glycine and inorganic salt produced by chloroacetic acid ammonolysis method is dissolved with deionized water to be mixed with 100kg of mixed solution, and its mass concentration is 30%; and the mass fraction of glycine in the glycine crude product is 50%, The mass fraction of ammonium chloride is 48%, and the rest are impurities; the pH of the mixed solution is adjusted and controlled by ammonia water to be 5.5-7 for the pH of the glycine solution;

[0030] Step 2: filter the above-mentioned mixed solution with a ceramic membrane with a filter aperture of 200 nanometers to obtain a ceramic membrane dialysate; adjust and control the pH of the mixed solution by ammonia water during the ceramic membrane filtration process so that the pH of the glycine solution is 5.5-7;

[0031] Step 3: The ceramic membrane dialysate is separated by a continuous chromatographic separation system filled with ammonium resin to obtain glycine s...

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Abstract

The invention discloses a glycine production technology. The glycine production technology comprises steps as follows: a mixed solution is prepared from a crude glycine product which is produced with a chloroacetic acid aminolysis method and contains glycine and inorganic salt through dissolving with deionized water, the mixed solution is subjected to ceramic membrane separation, continuous chromatographic separation, concentration, crystallization, centrifugation and crystal drying, and glycine crystals and ammonium chloride crystals are obtained. With the adoption of the technical scheme of the glycine production technology, glycine production is performed by adopting ceramic membrane separation and continuous chromatographic separation systems, and the glycine production technology has the beneficial effects that the target products, namely, glycine and ammonium chloride, are high in product quality, high in yield and low in energy consumption.

Description

technical field [0001] The invention relates to the field of glycine, in particular to a glycine production process. Background technique [0002] Glycine (Gly), also known as aminoacetic acid, is an amino acid with the simplest structure in the amino acid series and is not necessary for the human body. It has both acidic and basic functional groups in the molecule. It is a strong electrolyte in aqueous solution and has a high solubility in strong polar solvents. Larger, basically insoluble in non-polar solvents, and has a higher boiling point and melting point, through the adjustment of the acidity and alkalinity of the aqueous solution, glycine can exhibit different molecular forms. Among them, the industrial grade glycine is mainly used as a pesticide and the main raw material of the herbicide glyphosate. At present, the technical route of industrialized production of glycine mainly includes chloroacetic acid ammonolysis method, Strecker method (cstercker method), hydrog...

Claims

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Application Information

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IPC IPC(8): C07C229/08C07C227/40C01C1/16
CPCC07C227/40C01C1/164
Inventor 李春梅
Owner QINGDAO SENMEIKE CHEM TECH CO LTD
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