Prepn of DL-alanine

A preparation process, alanine technology, is applied in the field of DL-alanine preparation process, which can solve the problems of large amount of three wastes, long operation cycle, and low treatment efficiency, and achieve easy quality control, pollution avoidance, and simplified The effect of steps

Inactive Publication Date: 2007-01-03
HEBEI HUAYANG BIOLOGICAL TECHNOLOGY CO LTD
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

This process has the disadvantages of long operation period, low temperature freezing, low efficiency of ion exchange resin treatment, and large amount of three wastes

Method used

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  • Prepn of DL-alanine

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Experimental program
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Effect test

Embodiment 1

[0016] Put 130 kilograms of L-alanine as raw material, 0.18 kilograms of salicylaldehyde as a catalyst and 1200 kilograms of glacial acetic acid solution into a reaction kettle and heat to dissolve and react at 80°C; keep the temperature at 100°C for evaporation and concentration, and pass The role of the catalyst breaks the hydrogen bond of the carbon atom in L-alanine and transfers it to obtain racemic DL-alanine; after cooling the mother liquor of racemic DL-alanine to 50°C, The DL-alanine supersaturated crystals containing impurities are precipitated. After the crystals are placed in a centrifuge and dried by centrifugation, they are placed in a double-cone dryer and heated to 120°C to dry to obtain the second crude product DL-alanine. Acid; add deionized water with activated carbon to the crude product DL-alanine for supersaturated recrystallization, put the crystals in a centrifuge again to dry them, and put them in a double-cone dryer and heat them to 120°C Dry at a tem...

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Abstract

The present invention belongs to the field of amino acid preparing technology, and is especially preparation process of DL-ananine. The technological scheme includes heating and dissolving L-ananine added with catalyst in glacial acetic acid solution, evaporating and concentrating to obtain racemized DL-ananine, and cooling, crystallizing, centrifugal drying, stoving and other steps to obtain high content DL-ananine product. The preparation process is a one-reaction step process and is simple, and has no side product exhaustion, no environmental pollution and low production cost.

Description

technical field [0001] The invention belongs to the technical field of amino acid preparation, and specifically discloses a preparation process of DL-alanine. Background technique [0002] DL-alanine (DL-Alanine) is a kind of amino acid, and its physical properties are white needle-like crystals or crystalline powder. Other main raw materials for organic synthesis. [0003] Currently, the preparation of DL-alanine includes three processes: Streck method, α-halogenated acid method and phase transfer catalytic synthesis. in [0004] The Streck method is: acetaldehyde and hydrogen cyanide form cyanohydrin, after removing excess hydrogen cyanide, add it to ammonia solution to generate aminonitrile, hydrolyze with alkali to obtain the sodium salt of alanine, and treat it with ion exchange resin to obtain DL- α-alanine, obtained by recrystallization from water or ethanol aqueous solution. Using this method to prepare DL-alpha-alanine, although the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C227/36C07C229/08
Inventor 贾京潭
Owner HEBEI HUAYANG BIOLOGICAL TECHNOLOGY CO LTD
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