Device and process for washing glycine crude product through alcohol phase method

A glycine, alcohol phase method, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve problems such as difficulty in breaking through 85%, high equipment and pipeline requirements, and inability to recover.

Active Publication Date: 2019-10-08
HUBEI TAISHENG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the domestic industrial production process of glycine still adopts the traditional ammonolysis method of chloroacetic acid with water as the solvent. This method 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
However, it is difficult to control the amount of ammonia, the end point of the reaction, and the complete recovery of triethylamine, and it is easy to cause the content of ammonium chloride in glycine to be too high, which cannot meet the requirements of the national standard (the main content is ≥ 98.5%, and the content of chloride radicals is less than or equal to 0.4%). Glycine products suitable for glyphosate production

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  • Device and process for washing glycine crude product through alcohol phase method

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Effect test

Embodiment 1

[0028] A device for washing crude glycine by an alcohol phase method, the crude glycine pipeline 10, the first methanol pipeline 11, and the second methanol pipeline 12 are connected to a glycine centrifuge;

[0029] The washing liquid of the glycine centrifuge is divided into three routes, one is connected with the concentrated methanol washing tank, and the concentrated methanol washing tank is connected with the glycine synthesis kettle through the concentrated methanol pump; the other is connected with the dilute methanol washing tank, and the dilute methanol washing tank is passed through the di The methanol pump is connected with the glycine extraction kettle and the glycine centrifuge; one path is connected with the washing water tank, and the washing water tank is connected with the glycine centrifuge through the washing water pump.

[0030] The glycine extraction kettle is divided into three paths, one path is connected with the dilute methanol washing tank through the...

Embodiment 2

[0036]The glycine washing centrifuge adopts the L(P) LGZ-1600 flat-plate automatic bag-pull scraper discharge centrifuge from Jiangsu Saideli Pharmaceutical Machinery Manufacturing Co., Ltd. Take 300kg of crude glycine from the first batch, wash it 3 times with 600L99.7% concentrated methanol (temperature 26.7℃), centrifuge washing speed 200rpm / min, drying speed 800rpm / min, drying time for the first 2 times 5min, the third time The drying time is 10 minutes each time. Then use 600L 92% methanol to wash circularly for 10 minutes, the washing speed of centrifuge is 200rpm / min, the drying speed is 800rpm / min, and the drying time is 10min. Then wash with 600L water circulation for 10 minutes, the washing speed of the centrifuge is 200 rpm / min, the drying speed is 800 rpm / min, and the drying time is 10 minutes. Finally, rinse with 300L92% methanol for 3 times, centrifuge washing speed 200rpm / min, drying speed 850rpm / min, drying time 15min, sampling analysis main content 99.18%, ch...

Embodiment 3

[0038] The glycine washing centrifuge adopts the L(P) LGZ-1600 flat-plate automatic bag-pull scraper discharge centrifuge from Jiangsu Saideli Pharmaceutical Machinery Manufacturing Co., Ltd. Take 300kg of crude glycine, wash 3 times with 900L99.7% concentrated methanol (temperature 26.7°C), centrifuge washing speed 200rpm / min, spin-drying speed 800rpm / min, the drying time of the first 2 times is 5min, and the drying time of the third time 10min. Then wash with 900L 92% methanol in a circular manner for 10 minutes, the washing speed of the centrifuge is 200 rpm / min, the drying speed is 800 rpm / min, and the drying time is 10 minutes. Then use 900L water to circulate and wash for 10 minutes, the centrifuge washing speed is 200rpm / min, the drying speed is 800rpm / min, and the drying time is 10min. Finally, rinse with 300L92% methanol for 3 times, centrifuge washing speed 200rpm / min, drying speed 850rpm / min, drying time 15min, sampling and analysis main content 98.98%, chlorine co...

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Abstract

The invention relates to a device and a process for washing a glycine crude product through an alcohol phase method. A glycine centrifuge is connected with a diluted methanol washing tank which is connected with a glycine extraction kettle through a diluted methanol pump, the glycine extraction kettle is connected with an extracted glycine centrifuge which is connected with a methanol rectifying tower through an extract transfer pump, and the methanol rectifying system is connected to a red ammonium concentration system. Alcohol and chloroacetic acid are taken as a solvent and an initial raw material respectively in the process, a glycine product meeting glyphosate synthesis requirements and reaching national standards (main content being greater than or equal to 98.5% and chlorine root being less than or equal to 0.4%) is obtained by treating the glycine crude product (glycine main content being 93-96%, chlorine root being 2-4% and other impurities being lower than 1%) produced by newprocesses like a mixed solvent or organic amine or novel halogen formula reagent method through a systematic industrial washing process, and glycine synthesis yield is unaffected; wastewater is completely recycled into a system, so that clean production is realized.

Description

technical field [0001] The invention discloses a device and process for producing glycine by an alcohol phase method, which belongs to the technical field of chemical production, and in particular relates to a new method for washing materials produced by an alcohol phase method for glycine and waste water reuse. Background technique [0002] Glycine is aminoacetic acid, as an important fine chemical intermediate and chemical raw material, it is widely used in the fields of pesticide glyphosate, medicine, food and feed additives, etc. At present, the domestic industrialized production process of glycine still adopts the traditional ammonolysis method of chloroacetic acid using water as a solvent. This method 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 requires high equipment and pipelines, high maintenance freque...

Claims

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Application Information

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IPC IPC(8): C07C227/40C07C229/08
CPCC07C227/40C07C229/08
Inventor 姚红刘三六
Owner HUBEI TAISHENG CHEM
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