Material washing method for industrial-grade glycine crude product

A glycine, industrial-grade technology, applied in non-aqueous solvents to produce qualified products of glycine, washing materials of industrial-grade crude glycine, can solve the problems of low conversion rate of glycine, non-recycling, high equipment operation and maintenance costs, etc.

Pending Publication Date: 2021-12-31
HUBEI TAISHENG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, domestic glycine enterprises still adopt the traditional ammonolysis method of chloroacetic acid using water as a solvent. After nearly 40 years of continuous optimization, the method still has the following problems: (1) High production cost
The urotropine catalyst cannot be recovered; 1 ton of glycine needs to consume about 6-7 tons of steam; the recovery of low-value-added ammonium chloride requires high equipment and pipelines, high maintenance frequency, and high equipment operation and maintenance costs
(2) Low yield, difficult to break through 85%
The system in the aqueous phase is highly alkaline, and the conversion rate of chloroacetic acid into glycine is low, and about 15% of chloroacetic acid is hydrolyzed to produce glycolic acid; when high temperature ammonia is insufficient, it is easy to produce iminodiacetic acid [NH(CH 2 COOH) 2 ] and aminotriacetic acid [N(CH 2 COOH) 3 ] and other by-products
(3) Environmental risks cannot be completely eliminated
But, this method also can only obtain glycine crude product (main content about 98%)

Method used

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  • Material washing method for industrial-grade glycine crude product
  • Material washing method for industrial-grade glycine crude product
  • Material washing method for industrial-grade glycine crude product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The industrial-grade glycine washing centrifuge adopts the L(P)LGZ-1600 flat-plate automatic bag-pull scraper bottom discharge centrifuge from Jiangsu Saideli Pharmaceutical Machinery Manufacturing Co., Ltd. Glycine crude product produced by any new glycine technology enters the centrifuge, after conventional feeding and centrifugation (solid material has been evenly distributed on the filter cloth of the centrifuge and there is no collapse, 400kg, the main content of glycine is 96.9-98.1%) , chloride ion content 0.9-2.5%), adopt this method to carry out washing treatment: (1) earlier the triethylamine 100L of the ethanol 500L of 99% mass fraction (the same below) and 99% content are configured into mixed solution for the first time , use a special washing tank for storage, and use a pump to connect the feed inlet of the centrifuge and the filtrate outlet to the washing tank to form a circulating washing circuit. (2) The first washing: adjust the washing speed of the ce...

Embodiment 2

[0023] The method and steps are the same as in Example 1, except that step (1) is as follows: 500 L of ethanol with a mass fraction of 99% and 150 L of dimethylamine with a content of 99% are configured to form the mixed solution for the first time, and stored in a special washing tank. At the same time, a pump is used to connect the feed inlet of the centrifuge and the outlet of the filtrate to the washing tank to form a circulation washing circuit. After the moisture content of glycine is dried by a 90°C tray dryer, the granules are better. Repeat the above operation 5 times, and the dry weight, product quality and yield after washing (the same below) are shown in Table 2 below.

[0024]

[0025]

Embodiment 3

[0027] The method and steps are the same as in Example 1, only step (1) is: first configure 500 L of ethanol with a mass fraction of 99% and caustic soda 10 kg into the mixed solution for the first time, store it in a special washing tank, and simultaneously use a pump to centrifugally The feed port of the machine and the filtrate outlet are connected with the washing tank to form a circulating washing circuit. After the moisture content of glycine is dried by a 90°C tray dryer, the granules are better. After the moisture content of glycine is dried by a 90°C tray dryer, the granules are better. Repeat the above operation 5 times, and the dry weight, product quality and yield after washing (the same below) are shown in Table 3 below.

[0028]

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Abstract

The invention relates to a material washing method for an industrial-grade glycine crude product. The method aims at a glycine crude product (the main content of glycine is 93%-96%, ammonium chloride is 2%-5%, and other impurities are 1%-2%) produced by a new process technology of glycine in a non-aqueous phase; wherein a glycine product which meets glyphosate synthesis and reaches the national standard (the main content is larger than or equal to 98.5%, and the chlorine radical is smaller than or equal to 0.4%) is obtained through two-step material washing of the prepared mixed solvent (the low-chain alcohol and the inorganic base or the organic base) and the low-chain alcohol solution. The method has the advantages of being easy to operate, low in cost and free of waste water generation.

Description

technical field [0001] The invention discloses a washing method for industrial-grade crude glycine, which belongs to the technical field of chemical production, and in particular relates to a new method for producing qualified glycine in a non-aqueous solvent. Background technique [0002] Glycine is aminoacetic acid, which is an important chemical intermediate. According to the proportion of consumption in various fields from high to low, it is pesticide, food, feed, medicine, etc. In my country, about 80% of glycine is used to produce herbicide grass Glyphosate. At present, domestic glycine enterprises still adopt the traditional ammonolysis method of chloroacetic acid using water as a solvent. After nearly 40 years of continuous optimization, this method still has the following problems: (1) High production cost. The hexamethamine catalyst cannot be recycled; 1 ton of glycine needs to consume about 6-7 tons of steam; the recovery of low-value-added ammonium chloride requi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C227/40C07C229/08
CPCC07C227/40C07C229/08
Inventor 姚红田义群彭春雪刘三六
Owner HUBEI TAISHENG CHEM
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