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Method for co-producing glycine and hydantoin, and apparatus thereof

A hydantoin and combined production technology, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of difficult purification of glycine, incomplete hydrolysis, many by-products, etc., to overcome incomplete hydrolysis , saving investment in production equipment and reducing production costs

Inactive Publication Date: 2015-09-16
CHONGQING UNISPLENDOUR CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the object of the present invention is to provide a joint production method and device of glycine and hydantoin, which can not only produce both simultaneously with the same set of equipment, but also make full use of equipment, reduce production costs, facilitate production adjustment, and especially can Overcome the disadvantages of incomplete hydrolysis, production of iminodiacetic acid, many by-products, difficult purification of glycine, and low yield in the preparation of glycine by the hydantoin method

Method used

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  • Method for co-producing glycine and hydantoin, and apparatus thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Production of ammonia carbonylation reaction liquid: In a 5000ml pressure-resistant reactor equipped with a pressurized sampling device and a stirring device, add 2364g of water, then feed in 216.5g of ammonia gas and 420.4g of carbon dioxide gas, raise the temperature to 100°C, and use 5.05g 453.8g of 40wt% hydroxyacetonitrile aqueous solution was added dropwise at a constant rate of 1 / min, and the reaction was completed for 1.5 hours. The pressure of the reaction system was 1.6MPa, and then the unreacted ammonia and carbon dioxide were removed under reduced pressure to obtain the ammonia carbonylation reaction solution. The obtained ammonia carbonylation reaction liquid is equally divided into two parts, and the production of hydantoin and glycine are carried out respectively.

[0031] Production of hydantoin: Concentrate the ammonia carbonylation reaction solution to 40wt% under reduced pressure, add 98wt% concentrated sulfuric acid equivalent to 15wt% of the concentr...

Embodiment 2

[0034] Production of ammonia carbonylation reaction liquid: In a 5000ml pressure-resistant reactor equipped with a pressurized sampling device and a stirring device, add 2364g of water, then feed in 216.5g of ammonia gas and 420.4g of carbon dioxide gas, raise the temperature to 100°C, and use 5.05g Add 453.8g of 40wt% hydroxyacetonitrile aqueous solution dropwise at a constant speed at a rate of 1 / min, and react for 1.5 hours after the addition. The pressure of the reaction system is 1.6MPa, and then the unreacted ammonia and carbon dioxide are removed under reduced pressure to obtain the ammonia carbonylation reaction solution. The obtained ammonia carbonylation reaction liquid is equally divided into two parts, and the production of hydantoin and glycine are carried out respectively.

[0035] Production of hydantoin: Concentrate the ammonia carbonylation reaction solution to 80wt% under reduced pressure, add the hydantoin crystallization mother liquor of Example 1, acidify a...

Embodiment 3

[0038] Production of ammonia carbonylation reaction liquid: In a 5000ml pressure-resistant reactor equipped with a pressurized sampling device and a stirring device, add 2364g of water, then feed in 216.5g of ammonia gas and 420.4g of carbon dioxide gas, raise the temperature to 100°C, and use 5.05g Add 453.8g of 40wt% hydroxyacetonitrile aqueous solution dropwise at a constant speed at a rate of 1 / min, and react for 1.5 hours after the addition. The pressure of the reaction system is 1.6MPa, and then the unreacted ammonia and carbon dioxide are removed under reduced pressure to obtain the ammonia carbonylation reaction solution. The obtained ammonia carbonylation reaction liquid is equally divided into two parts, and the production of hydantoin and glycine are carried out respectively.

[0039] Production of hydantoin: Concentrate the ammonia carbonylation reaction solution to 80wt% under reduced pressure, add the hydantoin crystallization mother liquor of Example 2, acidify a...

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Abstract

The invention discloses a method for co-producing glycine and hydantoin, and an apparatus thereof. The method adopting hydroxyacetonitrile, ammonia, carbon dioxide and water, or hydroxyacetonitrile, ammonia, ammonium bicarbonate and water, or hydroxyacetonitrile, ammonium carbonate, carbon dioxide and water as raw materials comprises the following steps: carrying out an amidocarbonylation reaction on the raw materials at a temperature of 60-120DEG C under a pressure of 1.5-3.0MPa according to a molar ratio of hydroxyacetonitrile: ammonia: carbon dioxide: water of 1:3-5:2-4:46-50 in a reaction system to prepare an amidocarbonylation reaction solution; acidifying the amidocarbonylation reaction solution to obtain a hydantoin product, or carrying out ammonification hydrolysis on the amidocarbonylation reaction solution to prepare a glycine product The method and the apparatus can save the investment of apparatuses for prodcuign glycine and hydantoin, reduce the production cost, are convenient for adjusting the outputs of glycine and hydantoin, and especially overcome the disadvantages of incomplete hydrolysis, generation of iminodiacetic acid, many byproducts, difficult purification of glycine, and low yield of present hydantoin methods for preparing glycine.

Description

technical field [0001] The invention belongs to the field of chemical industry and relates to a method and a device for jointly producing two compounds. Background technique [0002] The production of glycine by hydroxyacetonitrile is a new method reported in recent years. The method is divided into two types: the first one, as described in Chinese patent CN1962611B, is to react hydroxyacetonitrile and ammonia water to obtain an ammonia solution of aminoacetonitrile; Deamination of the solution, neutralization with inorganic acid, decolorization, concentration and fractional crystallization and recrystallization, then glycine and inorganic salts are obtained respectively; It is more complicated, the product is not easy to refine, the separation of glycine, iminodiacetic acid and nitrilotriacetic acid is difficult, and the glycine crystallization mother liquor is difficult to recycle, the loss of glycine is relatively large, and a large amount of low-value inorganic salts an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C227/18C07C229/08C07D233/74
Inventor 吴传隆王用贵秦岭李欧杨帆陈宏扬姚如杰郑道敏
Owner CHONGQING UNISPLENDOUR CHEM
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