Method and device for clean production of glycine

A clean production, glycine technology, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of difficult to treat waste water and residues, high energy consumption for separation and purification, difficult separation of mixed liquids, etc., and achieve low production costs. , The effective conversion rate is high, and the effect of increasing corrosion resistance

Inactive Publication Date: 2018-04-27
CHONGQING UNISPLENDOUR CHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The hydroxyacetonitrile method is divided into two situations again: the first situation: as the patent CN1962611B discloses a kind of processing method using hydroxyacetonitrile as raw material to prepare glycine, that is to say, the mixed reaction of hydroxyacetonitrile and ammonia water to obtain the ammonia solution of aminoacetonitrile, will obtain The ammoniated solution is directly added dropwise to about 40% sodium hydroxide aqueous solution, and the hydrolysis reaction is carried out at 80°C, and then deamination treatment is carried out under negative pressure conditions to obtain a mixture of sodium glycinate and disodium iminodiacetate Aqueous solution; the obtained mixed aqueous solution of sodium glycinate and disodium iminodiacetic acid is acidified with concentrated sulfuric acid to about pH=5.5, then decolorized, concentrated at high temperature to take sodium sulfate, and the feed liquid after taking sodium sulfate is cooled to 30 ° C ~ 40 ° C crystallization to obtain the glycine crude product, and the mother liquor is recycled; but this process method has the following disadvantages: (1) the product is not easy to refine, and a large amount of low-value sodium sulfate is produced as a by-product, and the generation cost is relatively high; (2) containing glycine, imino disulfide ...

Method used

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  • Method and device for clean production of glycine
  • Method and device for clean production of glycine
  • Method and device for clean production of glycine

Examples

Experimental program
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Effect test

Embodiment 1

[0063] Adding purity is 99.0% ammonium carbonate 193.94 grams (2.0mol) in the reactor that has pressure sampling device and stirring device 1000ml pressure-resistant lining zirconium material, pure water 483g, be warming up to 60 ℃ (CO 2 / NH 3 = 1:2 molar ratio). When the temperature was raised to 120°C, 95 grams of 40% hydroxyacetonitrile (60°C) was added, and the addition was completed in 1 hour (NH 3 / hydroxyacetonitrile=6:1 molar ratio), the addition rate is 1.21g / min, after the addition is completed, it is kept at 120°C for 1 hour, and the pressure in the reactor is 2.0MPa.

[0064] Release the pressure of the above reaction to normal pressure, then carry out air stripping at 40°C to remove part of the carbon dioxide, and continue to return the obtained feed liquid to the above-mentioned 1000ml reactor to seal it, and immediately raise the temperature to 160°C, and the pressure in the reactor is 2.2MPa , keep warm for 2 hours. After the reaction, release the pressure t...

Embodiment 2

[0067] Add 483 grams of pure water to a 1000ml pressure-resistant zirconium-lined reactor equipped with a pressurized sampling device and a stirring device, preheat to 60°C, add 102 grams of ammonia and 88 grams of carbon dioxide at the same time, and then heat up to 120°C for 30 minutes 95 grams of 40% hydroxyacetonitrile (60° C.) was added through a metering pump, and the molar ratio of hydroxyacetonitrile to ammonia, carbon dioxide, and water was 1:6:3:45. After the addition is complete, keep the temperature at 120° C. for 1 hour, and the pressure in the reactor is 2.1 MPa.

[0068] Release the pressure of the above reaction to normal pressure, then carry out air stripping at 40°C to remove part of the carbon dioxide, and continue to return the obtained feed liquid to the above-mentioned 1000ml reactor to seal it, and immediately raise the temperature to 160°C, and the pressure in the reactor is 2.2MPa , keep warm for 2 hours. After the reaction, release the pressure to no...

Embodiment 3

[0071] Add 483 grams of pure water to a 1000ml pressure-resistant titanium-lined reactor equipped with a pressurized sampling device and a stirring device, preheat to 60°C, add 102 grams of ammonia and 88 grams of carbon dioxide at the same time, then raise the temperature to 120°C, and in 30 minutes 95 grams of 40% hydroxyacetonitrile (60° C.) was added through a metering pump, and the molar ratio of hydroxyacetonitrile to ammonia, carbon dioxide, and water was 1:6:3:45. After the addition is complete, keep the temperature at 120° C. for 1 hour, and the pressure in the reactor is 2.1 MPa.

[0072] Release the pressure of the above reaction to normal pressure, then carry out air stripping at 40°C to remove part of the carbon dioxide, and continue to return the obtained feed liquid to the above-mentioned 1000ml reactor to seal it, and immediately raise the temperature to 160°C, and the pressure in the reactor is 2.2MPa , keep warm for 2 hours. After the reaction, the pressure ...

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Abstract

The invention belongs to the field of a chemical industry and particularly relates to a method and device for clean production of glycine. The method for clean production of glycine comprises that hydroxyacetonitrile, ammonia, carbon dioxide and water as raw materials undergo a reaction in a special material synthesis reactor, the pressure of the synthesis reactor is reduced to the normal pressureso that a material liquid I is obtained, the material liquid I is heated and hydrolyzed, the pressure of the hydrolysate is reduced to the normal pressure, ammonia is removed so that a material liquid II is obtained, and the material liquid II is treated through a conventional treatment method so that glycine is obtained. The method is environmentally friendly and clean, does not produce by-products, has a high effective conversion rate of hydroxyacetonitrile, greatly improves the glycine yield through a special material, reduces the hydroxyacetonitrile by-products and produces glycine dipeptide to increase corrosion resistance of the material. The device is simple. The method is easy to operate and realizes a low cost.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a clean production method and device of glycine. Background technique [0002] There are many preparation techniques for glycine. The production of glycine by hydroxyacetonitrile method is a method that has been reported more in recent years. Compared with the chloroacetic acid method, this method is more environmentally friendly and has attracted attention at home and abroad. The hydroxyacetonitrile method is divided into two situations again: the first situation: as the patent CN1962611B discloses a kind of processing method using hydroxyacetonitrile as raw material to prepare glycine, that is to say, the mixed reaction of hydroxyacetonitrile and ammonia water to obtain the ammonia solution of aminoacetonitrile, will obtain The ammoniated solution is directly added dropwise to about 40% sodium hydroxide aqueous solution, and the hydrolysis reaction is carried out at...

Claims

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Application Information

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IPC IPC(8): C07C227/18C07C229/08
Inventor 龙晓钦孙洪飞代小妮吴传隆任权罗延谷韩伟徐刚李勇
Owner CHONGQING UNISPLENDOUR CHEM
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