Production method of feed-grade and food-grade glycine and device for implementing production method

A glycine, food-grade technology, used in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of high refining cost, increased by-products, and high energy consumption for crystallization, and achieves high operational flexibility and efficient conversion. The effect of high yield, high yield and high purity

Inactive Publication Date: 2021-06-29
BOZUN INVESTMENT GRP LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But there is following shortcoming in this method: by-products such as ammonium chloride are difficult to remove, product and ammonium chloride are separated difficultly, produce a large amount of difficult-to-handle saline, contain glycine waste water, product quality is poor, and chloride ion content is higher in the product, to follow-up The corrosiveness of the equipment is difficult to overcome, and the refining cost is high; the catalyst hexatropine cannot be recovered, the production cost is high, and the reaction time is long
However, at present, there are mainly the following technical problems in the synthesis of glycine by hydantoin method: 1) due to the poor thermal stability of raw material hydroxyacetonitrile, it is easy to decompose, polymerize and generate other by-products when participating in the reaction under high temperature and pressure, so that glycine can be collected 2) Due to the excessive amount of ammonia and carbon dioxide in the system, it is highly corrosive to pipe fittings under high temperature and high pressure reaction conditions; 3) The glycine crystallization mother liquor contains byproducts such as hydantoin acid and glycine di

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  • Production method of feed-grade and food-grade glycine and device for implementing production method
  • Production method of feed-grade and food-grade glycine and device for implementing production method
  • Production method of feed-grade and food-grade glycine and device for implementing production method

Examples

Experimental program
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Effect test

Embodiment 1

[0169] 290.91 grams of ammonium carbonate with a purity of 99.0% and 750 grams of deionized water were added to a 1000ml pressure-resistant zirconium-lined reactor with a feeding and stirring device, and the temperature was raised to 65° C. to obtain an aqueous solution of ammonium carbonate. Squeeze 142.5 grams (50 ℃, pH=3.0) of 40wt% hydroxyacetonitrile aqueous solution preheated in advance from the feed port of the reactor with a booster pump, the mol ratio of hydroxyacetonitrile, ammonium carbonate and water is 1:3:46.4, During the process of adding the aqueous solution of hydroxyacetonitrile, the reactor was heated to 100°C for reaction, and the stirring speed was 120r / min, the speed of adding the aqueous solution of hydroxyacetonitrile was 8.0g / min, and the liquid level of the reaction material was 96%. After the addition of the hydroxyacetonitrile aqueous solution was completed, the reactor was closed, and the temperature was raised to 150° C. immediately, the pressure i...

Embodiment 2

[0175] 290.91 grams of ammonium carbonate with a purity of 99.0% and 869.3 grams of deionized water were added to a 1500ml pressure-resistant zirconium-lined reactor with a feeding and stirring device, and the temperature was raised to 50° C. to obtain an aqueous solution of ammonium carbonate. Squeeze 87.7 grams (70 ℃, pH=2.0) of the 65wt% hydroxyacetonitrile aqueous solution that preheats beforehand with booster pump from the inlet of reactor, the mol ratio of hydroxyacetonitrile, ammonium carbonate and water is 1:3:50, During the process of adding the aqueous solution of hydroxyacetonitrile, the temperature of the reactor was raised to 135° C., and the stirring speed was 120 r / min. The rate of adding the aqueous solution of hydroxyacetonitrile was 8.0 g / min, and the liquid level of the reaction material was 76%. After the addition of the hydroxyacetonitrile aqueous solution was completed, the reactor was closed, and the temperature was raised to 150° C. immediately, the pres...

Embodiment 3

[0179] 232.73 grams of ammonium carbonate with a purity of 99.0% and 602.4 grams of deionized water were added to a 1000ml pressure-resistant zirconium-lined reactor with a feeding and stirring device, and the temperature was raised to 65° C. to obtain an aqueous solution of ammonium carbonate. Squeeze 91.2 grams (60 ℃, pH=4.0) of the 50wt% hydroxyacetonitrile aqueous solution that preheats beforehand with pressurized pump from the inlet of reactor, the mol ratio of hydroxyacetonitrile, ammonium carbonate and water is 1:3:45, During the process of adding the aqueous solution of hydroxyacetonitrile, the temperature of the reactor was raised to 120° C., and the stirring speed was 150 r / min. The rate of adding the aqueous solution of hydroxyacetonitrile was 5.0 g / min, and the liquid level of the reaction material was 85%. After the addition of the aqueous solution of hydroxyacetonitrile was completed, the reactor was closed, and the temperature was raised to 152° C. immediately, t...

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Abstract

The invention relates to a production method for feed-grade and food-grade glycine and a device for implementing the method. The method comprises the following steps: with an aqueous hydroxyacetonitrile solution and an aqueous ammonium carbonate solution as raw materials, sequentially conducting reacting at 100-135 DEG C and 150-160 DEG C in the presence of a zirconium raw material, and controlling the liquid level of the reactions to be 75% or more; in the presence of the zirconium raw material, concentrating obtained reaction feed liquid under heating, removing ammonia and carbon dioxide, and then performing decoloration; and then in the presence of the zirconium raw material, subjecting the obtained decoloration solution to vacuum concentration and crystallization so as to obtain feed-grade and food-grade glycine products, wherein the yield of glycine is 97% or above in terms of glycolonitrile. The production method has the advantages that almost no three wastes are generated, the method is clean and environment-friendly, no organic solvent is needed, repeated recrystallization is not needed, the yield of feed-grade and food-grade glycine is high, production cost is low, an automation degree is high, and the like.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a production method of feed-grade and food-grade glycine and a device for implementing it. Background technique [0002] Glycine is an important chemical product, mainly used in pesticide, food and pharmaceutical industries. In the pesticide industry, it is mainly used to produce the herbicide glyphosate; in the food industry, it is used alone or in combination with sodium glutamate as a flavoring agent, and it is also used in the synthesis of wine, brewing products, and can also be used as butter, margarine and Cheese additive to prolong its shelf life; in the pharmaceutical industry, it can be used as a buffer for amino acid preparations, aureomycin, and as a synthetic raw material for Parkinson's disease drug L-dopa. In addition, glycine can also be used as biochemical reagents and solvents in organic synthesis and biochemistry. [0003] The global production of ...

Claims

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Application Information

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IPC IPC(8): C07C229/08C07C227/12C07C227/40C07C227/42
CPCC07C227/12C07C227/40C07C227/42C07C229/08
Inventor 李显扬应国海耿海涛
Owner BOZUN INVESTMENT GRP LTD
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