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Deamination new process by alkaline hydrolysis of nitrile compounds

A technology for compounds and nitriles, applied in the field of alkaline hydrolysis and deamination of nitrile compounds, can solve the problems of difficulty in ammonia condensation and recovery, high power consumption, high water consumption, low concentration of ammonia water, etc. Effects of Ammonia Efficiency

Active Publication Date: 2014-05-28
BEIJING ZIGUANG YINGLI CHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Decompression deamination not only needs to be equipped with a vacuum system, but also consumes a lot of electricity and water. It is also difficult to condense and recover ammonia, which is one of the more troublesome links in industrial production.
Since the solubility of ammonia in water is more affected by temperature than pressure, to reduce the content of ammonia in the deamination solution, deamination must be carried out at a higher temperature. The boiling point is low, and a large amount of water is easily vaporized and brought out, resulting in a low concentration of ammonia water, poor recovery rate of ammonia, and high energy consumption.

Method used

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  • Deamination new process by alkaline hydrolysis of nitrile compounds

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 4180kg aminoacetonitrile aqueous solution (wherein containing aminoacetonitrile 1120kg), after preheating to 60 ℃ through heat exchanger, and 32% liquid caustic soda of 1895L (specific gravity is 1.32) are pumped into rapid mixing alkaline hydrolysis reactor respectively through metering pump. During the reaction process of the rapid mixing alkaline hydrolysis reactor, aminoacetic acid is produced and ammonia is released at the same time. The reaction is an exothermic reaction. Under a slight negative pressure, the ammonia produced by the reaction is carried away with water, and the heat generated by the reaction is taken away at the same time. The temperature of the hot water in the jacket is adjusted to maintain the temperature of the reaction material at about 75°C. , each batch of aminoacetonitrile hydrolyzate stays in the reactor for 35 minutes. After metering by the metering tank, 480L of ammonia water is produced every 35min. The hydrolyzate and ammonia water we...

Embodiment 2

[0026] 3960kg of anilinoacetonitrile aqueous solution (wherein containing 1320kg of anilinoacetonitrile), heated to 50°C, and 1420L (specific gravity of 1.32) of 32% caustic soda are respectively pumped into the hydrolysis reactor through metering pumps. During the reaction, sodium anilinoacetate is formed and ammonia is released. The reaction is an exothermic reaction. Under a slight negative pressure, the ammonia produced by the reaction is carried away with water, and the heat generated by the reaction is taken away at the same time. The temperature of the hot water in the jacket is adjusted to maintain the temperature of the reaction material at about 65°C. , each batch of anilinoacetonitrile hydrolyzate stays in the reactor for 30 minutes. After metering by the metering tank, 315L of ammonia water is produced every 30 minutes. The hydrolyzate and ammonia water were sampled and analyzed respectively. Among them, the specific gravity of ammonia water was 0.92, the concentr...

Embodiment 3

[0031] Add 3000L of process water to the 5000L dissolution kettle, turn on the steam to raise the temperature to 85°C, add 1630kg (15.78kmol) of iminodiacetonitrile solid with a content of 92% under stirring, and the temperature in the kettle is 72°C after the dissolution. 3510L of 30% liquid caustic soda is metered by a metering pump, and the dissolved iminodiacetonitrile solution is injected into a rapid mixing alkaline hydrolysis reactor through a metering pump respectively. During the reaction process of the rapid mixing alkaline hydrolysis reactor, through efficient mass transfer and heat transfer, the iminodiacetonitrile and sodium hydroxide in the material are fully contacted and reacted, and ammonia is released at the same time. The alkaline hydrolysis reaction is an exothermic reaction. Under a slight negative pressure, the ammonia produced by the reaction is carried away with water, and the heat generated by the reaction is taken away at the same time. The reaction te...

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Abstract

The invention provides a new deamination process method for preparing amino acids by alkaline hydrolysis of nitrile compounds (such as aminoacetonitrile, anilinoacetonitrile, iminodiacetonitrile and the like). The method can control the reaction temperature by decompression control of deamination degree, realize continuous fast large-scale alkaline hydrolysis and realize fast and high-efficient complete removal of free ammonia. The method can greatly improve the removal rate of ammonia, the recovery rate of the ammonia and the product quality, reduce material consumption and energy consumption, reduce equipment investment and achieve the purposes of energy conservation and emission reduction.

Description

technical field [0001] The invention relates to a new process for alkaline deammoniation of nitrile compounds. Background technique [0002] Alkaline hydrolysis, deamination, and acidification of nitrile compounds are important methods for the synthesis of carboxylic acids, especially amino acids, and are also one of the most important uses of hydrocyanic acid as an intermediate in organic synthesis. The reaction of hydrocyanic acid and formaldehyde can easily obtain hydroxyacetonitrile, and the reaction of hydroxyacetonitrile with ammonia or amine can easily obtain aminoacetonitrile, iminodiacetonitrile, anilinoacetonitrile, etc., which can be obtained after alkaline hydrolysis, deamination, acidification, crystallization and separation corresponding amino acids. [0003] Alkaline hydrolysis and deamination of nitriles are carried out under reduced pressure. Since nitriles are prone to substitution and polymerization reactions during hydrolysis under alkaline conditions t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C227/26C07C227/40C07C229/08C07C229/18C07C229/16
Inventor 崔建斌廖翠莺李星黄仁才喻宏贵尹应武
Owner BEIJING ZIGUANG YINGLI CHEM TECH CO LTD