Method for preparing 5,5-dimethylhydantion

A technology of dimethyl hydantoin and production method, applied in the production field of 5,5 dimethyl hydantoin, can solve problems such as waste of ammonia and harsh environment, and achieve the effects of increasing economic benefit, increasing output and reducing waste

Active Publication Date: 2006-07-19
JIANGSU JIUJIUJIU TECH
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Problems solved by technology

Such a process uses heating of ammonium bicarbonate to generate CO 2 , the ammonia in it is wasted, and the lid of the reactor needs to be opened during operation, and a large amount of ammonia gas comes out
cause bad environment

Method used

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Examples

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Embodiment Construction

[0009] A kind of production method of 5,5 dimethylhydantoin, add ammoniacal liquor, acetone cyanohydrin to react in reactor, the mol ratio of ammoniacal liquor and acetone cyanohydrin in the reaction raw material is ammoniacal liquor: acetone cyanohydrin=1: 0.8, and Acetone cyanohydrin is added dropwise to ammonia water at 30-40°C. After adding acetone cyanohydrin, open the gas input valve of the reactor, and open the gas output valve on the condenser connected to the reactor to Into ammonium bicarbonate shift gas (the main component of the shift gas is: CO 2 27%, H 2 55%, N 2 16%, CO 2%), the feed rate of shift gas is 3M 3 / min, control the reaction temperature at 60-70°C, feed the total amount of shifted gas into the cumulative flowmeter, and feed the CO in the shifted gas 2 After the amount reaches the molar amount of ammonia, take a sample to test whether there is cyanide. If there is, continue to feed the shift gas to check that there is no cyanide. After the reacti...

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Abstract

The disclosed preparation method for 5, 5-dimethylhydantoin comprises: adding ammonia water and acetone cyanohydrin into the kettle for reaction; while starting the gas input valve of kettle and the connected gas output valve of condenser to lead NH4HCO3 converted gas into the kettle till there is no CN- in reaction material. This invention reduces device cost and CO2 waste, has some protection to environment, and improves production and economic benefit.

Description

Technical field: [0001] The invention relates to a production method of 5,5 dimethylhydantoin. Background technique: [0002] In the traditional dimethylhydantoin production process, add acetone cyanohydrin dropwise to 15% ammonia water at a molar ratio of ammonia: acetone cyanohydrin = 1:0.9 at 10°C, and add 1 / 3 of the molar amount of ammonia after the addition is complete. The ammonium bicarbonate is heated up at 60°C for 20 minutes, then the same amount of ammonium bicarbonate is added for 20 minutes, and finally the same amount of ammonium bicarbonate is added for 20 minutes, and the temperature is lowered and the material is discharged for filtration. Such a process uses heating of ammonium bicarbonate to generate CO 2 , the ammonia in it is wasted, and the lid of the reactor needs to be opened during operation, and a large amount of ammonia gas comes out. Create a bad environment. Invention content: [0003] The object of the present invention is to provide a kind...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D233/74
Inventor 周新基郑晓兵高继业张龙华赵鑫峰
Owner JIANGSU JIUJIUJIU TECH
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