Method for preparing alpha-aminoisobutyric acid

A technology of aminoisobutyric acid and ammonia gas, which is applied in the chemical industry to avoid high equipment requirements, solve environmental pollution, and reduce equipment investment

Inactive Publication Date: 2014-06-18
CHONGQING UNISPLENDOUR INT CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The yield of this method synthetic 2-aminobutyric acid is only more than 50%, still needs to improve

Method used

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  • Method for preparing alpha-aminoisobutyric acid
  • Method for preparing alpha-aminoisobutyric acid
  • Method for preparing alpha-aminoisobutyric acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Add 1800g of water and 587.8g of 98% ammonium carbonate to the 3L reaction kettle, then seal it and preheat it to 60°C, then add 171.9g of 99% acetone cyanohydrin into the reaction kettle with a high-pressure feed pump, and immediately raise the temperature to 160°C , the pressure in the reactor is 5.0MPa, react at this temperature and pressure for 6 hours, then lower the temperature and cool down, then release the pressure and recover carbon dioxide and ammonia through a stripping tower, and the recovered ammonia and carbon dioxide are recycled to prepare ammonium carbonate. The conversion rate of acetone cyanohydrin is 99.9% for the reaction feed liquid obtained by the stripping column. The reaction solution was concentrated, cooled to 0°C for crystallization, and centrifuged to obtain 190.72 g of crude α-aminoisobutyric acid. The yield of α-aminoisobutyric acid was 86% (calculated by acetone cyanohydrin). The content of α-aminoisobutyric acid It is 93% and contains 6...

Embodiment 2

[0040] First add 1800g of water and 483.7g of 98% ammonium bicarbonate to the 3L reactor, then seal it and preheat it to 60°C, then add 171.9g of 99% acetone cyanohydrin into the reactor with a high-pressure feed pump, and immediately raise the temperature to 160 ℃, the pressure in the reactor is 5.0MPa, react at this temperature and pressure for 6 hours, then lower the temperature and cool down, and then release the pressure to recover carbon dioxide and ammonia through the stripping tower, and the recovered ammonia and carbon dioxide are recycled to the preparation of ammonium bicarbonate . The conversion rate of acetone cyanohydrin is 99.9% for the reaction feed liquid obtained by the stripping column. The reaction solution was concentrated, cooled to 0°C for crystallization, and centrifuged to obtain 137.5 g of crude α-aminoisobutyric acid. The yield of α-aminoisobutyric acid was 62% (calculated as acetone cyanohydrin). The content of α-aminoisobutyric acid It is 93% and ...

Embodiment 3

[0043] First add 1800g of water, 587.8g of 98% ammonium carbonate and the crystallization mother liquor obtained in Example 1 into a 3L reactor, then seal and preheat to 60°C, then add 171.9g of 99% acetone into the reactor with a high-pressure feed pump Cyanohydrin, immediately warming up to 160 ℃, the pressure in the reactor is 5.0MPa, react at this temperature and pressure for 6 hours, then cool down and cool down, then release the pressure and pass through the stripping tower to reclaim carbon dioxide and ammonia, the reclaimed ammonia and Carbon dioxide is recycled to make ammonium carbonate. The conversion rate of acetone cyanohydrin is 99.9% for the reaction feed liquid obtained by the stripping column. The reaction solution was concentrated, cooled to 0°C for crystallization, and centrifuged to obtain 199.51 g of crude α-aminoisobutyric acid. The yield of α-aminoisobutyric acid was 89% (calculated by acetone cyanohydrin). The content of α-aminoisobutyric acid It is 92...

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Abstract

The invention aims at the field of chemical industry and relates to a method for preparing alpha-aminoisobutyric acid. The method comprises the step of enabling acetone cyanohydrin and ammonium carbonate to be subjected to pressurized and heated reaction in an aqueous medium, thereby synthesizing alpha-aminoisobutyric acid, wherein ammonium carbonate can be replaced with ammonium bicarbonate or ammonia and carbon dioxide. The invention further relates to preparation using an alpha-aminoisobutyric acid production device, wherein a gas stripping device is especially used for recovering carbon dioxide and ammonia gas which are generated during synthesis reaction and are recycled for the synthesis of alpha-aminoisobutyric acid. According to the method disclosed by the invention, the yield is high, the purity of a product is high, and the equipment investment is small; in a whole process, carbon dioxide and ammonia are hardly consumed, no byproduct inorganic salt is produced, and inorganic base is not consumed, so that a very positive effect on the full and comprehensive utilization of resources and environmental protection is exerted; recovered carbon dioxide and ammonia and crystallized mother liquor are sufficiently utilized, so that the problem of pollution to environment caused by waste gases, waste water and waste residues can be excellently solved, and the environmental-friendly and clean production is really achieved.

Description

technical field [0001] The invention aims at the field of chemical industry and relates to a method for chemically synthesizing α-aminoisobutyric acid. Background technique [0002] my country is rich in characteristic fruit resources, among which, litchi, longan, papaya, kiwi, etc. are important characteristic fruits in our country. The fruit industry is the pillar industry of my country's agriculture, which plays a pivotal role in ensuring farmers' income and promoting regional economic development. Fresh fruit is a fresh product, which has the characteristics of rapid ripening, aging, corruption, and easy deterioration of quality after harvest. At present, the amount of postharvest loss is quite serious. The annual loss due to rot is more than 100 billion yuan, which seriously restricts the distribution and export of these famous fruits. [0003] At present, the storage methods of fruits and vegetables mainly include physical methods and chemical methods. Among them, ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C229/08C07C227/24C07C227/12
Inventor 吴传隆秦岭杨帆朱丽利朱晓莉郑道敏姚如杰
Owner CHONGQING UNISPLENDOUR INT CHEM
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