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Coproduction method and coproduction system of glycine and iminodiacetic acid

A technology of iminodiacetic acid and iminodiacetonitrile, which is applied in the co-production method of glycine and iminodiacetic acid and its co-production system field, can solve the problem of increasing the production cost of iminodiacetonitrile, environmental pollution, and inability to be effectively utilized and other issues, to achieve the effect of low production cost, simple industrial implementation and high production efficiency

Inactive Publication Date: 2017-05-31
CHONGQING UNISPLENDOUR CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reaction also generates part of aminoacetonitrile, which and excess hydroxyacetonitrile remain in the crystallization mother liquor and cannot be effectively utilized, which will not only increase the production cost of iminodiacetonitrile but also cause environmental pollution

Method used

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  • Coproduction method and coproduction system of glycine and iminodiacetic acid
  • Coproduction method and coproduction system of glycine and iminodiacetic acid
  • Coproduction method and coproduction system of glycine and iminodiacetic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Coproduction of embodiment 1 glycine and iminodiacetic acid

[0051] Follow the steps below to produce:

[0052] (1) Take the mixture containing aminoacetonitrile and iminodiacetonitrile, alkali hydrolyze with sodium hydroxide solution, obtain the mixed solution containing sodium glycinate and disodium iminodiacetate, its composition is as follows: about 12% sodium glycinate, about 2% sodium iminodiacetic acid, about 1% sodium hydroxide. Using sulfuric acid to adjust the pH of the mixed solution to 5±0.2, during which the temperature of the reaction solution is controlled not to exceed 100°C to obtain a mixed solution containing glycine, monosodium iminodiacetic acid and sodium sulfate;

[0053] (2) Separation of glycine: Cool the mixed solution containing glycine, monosodium iminodiacetic acid and sodium sulfate obtained in step (1) to 50°C, and use a continuous chromatographic separation system filled with sodium resin to separate to obtain glycine solution and a mi...

Embodiment 2

[0055] Coproduction of embodiment 2 glycine and iminodiacetic acid (with hydroxyacetonitrile and ammonia as starting raw materials)

[0056] Follow the steps below to produce:

[0057] (1) Ammonification: Mix hydroxyacetonitrile 543.0g (42%, 4.0mol) and ammonia water 544g (25%, 8.0mol), pump them into a tubular reactor, and carry out ammoniation at a temperature of 100-103°C. reaction, the reaction time was 7 minutes by controlling the flow rate to obtain a mixed solution containing aminoacetonitrile and iminodiacetonitrile;

[0058] (2) Alkaline hydrolysis: add 351.8g sodium hydroxide solution (50%, 4.4mol) in advance in alkaline hydrolysis reactor, collect aminoacetonitrile and iminodiacetonitrile at the outlet of tubular reactor with alkaline hydrolysis reactor Mix the solution, and the reaction liquid entering the alkaline hydrolysis reactor immediately undergoes alkaline hydrolysis reaction at a temperature of 80-85°C, recovers the ammonia present in the reaction system ...

Embodiment 3

[0063] The cyclic coproduction of embodiment 3 glycine and iminodiacetic acid (with hydroxyacetonitrile and ammonia as starting materials)

[0064] The cyclic coproduction of glycine and iminodiacetic acid follows the attached figure 1 Proceed as shown in the flowchart.

[0065] first round:

[0066](1) Ammonification: Mix hydroxyacetonitrile 543.0g (42%, 4.0mol) and ammonia water 544g (25%, 8.0mol), pump them into a tubular reactor, and carry out ammoniation at a temperature of 100-103°C. reaction, the reaction time was 7 minutes by controlling the flow rate to obtain a mixed solution containing aminoacetonitrile and iminodiacetonitrile;

[0067] (2) Alkaline hydrolysis: add 351.8g sodium hydroxide solution (50%, 4.4mol) in advance in alkaline hydrolysis reactor, collect aminoacetonitrile and iminodiacetonitrile at the outlet of tubular reactor with alkaline hydrolysis reactor The mixed solution, the reaction solution entering the alkaline hydrolysis reactor immediately un...

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Abstract

The invention particularly relates to a glycine and iminodiacetic acid cogeneration method and cogeneration system. The method includes the steps: performing alkaline hydrolysis and acidification for mixed liquor containing aminoacetonitrile and iminodiacetonitrile to obtain mixed liquor containing glycine and iminodiacetic acid salt; separating the mixed liquor containing the glycine and the iminodiacetic acid salt by continuous color spectra to respectively obtain glycine liquor and liquor containing the iminodiacetic acid salt. The glycine and iminodiacetic acid cogeneration system comprises a glycine production system unit and an iminodiacetic acid production system unit which are connected through the continuous color spectra jointly possessed by the two units. The glycine and iminodiacetic acid can be simultaneously separated and purified at high purity, by-products are avoided, product yield and purity are improved, and the method is high in production efficiency, simple to operate, green and environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of production, separation and purification of organic compounds, and specifically relates to a co-production method of glycine and iminodiacetic acid and a co-production system thereof. Background technique [0002] Glycine, also known as aminoacetic acid, is an important fine chemical synthesis intermediate, mainly used in the synthesis of pesticide glyphosate. At present, it has been widely used in medicine, food, chemical industry, pesticide and other fields. The food and pharmaceutical industries have gradually become the largest demand areas for the use of glycine, and its market demand is very large. In 2010, the global demand will be close to 1000kt. Iminodiacetic acid (IDA for short) is also known as bisglycine and aminodiacetic acid, and its molecular formula is NH(CH 2 COOH) 2 . Iminodiacetic acid is an important raw material and intermediate for pesticides, pharmaceuticals, rubber, surfactants...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C227/26C07C229/08C07C229/16C07C227/40
Inventor 丁永良徐代行柳亚玲展亚萍金海琴刘佳王冬林
Owner CHONGQING UNISPLENDOUR CHEM
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