13253-44-6Relevant articles and documents
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Holland,Nayler
, p. 3403,3407 (1952)
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Single-step synthesis of 5-(β-methylthioethyl)hydantoin from acrolein cyanohydrin and acrolein
Shibuya,Ouchi
, p. 589 - 591 (1988)
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METHOD FOR PRODUCING METHIONINE
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Paragraph 0100-0105, (2021/03/13)
An object of the present invention to provide a method for producing methionine with consideration given to the environment. The production method of the present invention comprises a removal step of blowing an inert gas into a liquid containing 5-(2-methylmercaptoethyl)hydantoin and thereby diffusing ammonia remaining in the liquid to obtain an emission gas containing the ammonia, and a recovery step of bringing the emission gas into contact with a washing liquid to recover ammonia contained in the emission gas.
By coarse hydrocyanic acid gas preparation 5 - (2-methylthioamphetamine amido ethyl)-hydantoin method
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Paragraph 0052; 0053, (2017/03/08)
The invention relates to a method for preparing 5-(2-methylmercapto-ethyl)-hydantoin by utilizing crude hydrocyanic acid gas and relates to the field of chemical industry. The method disclosed by the invention comprises the following steps of: completely reacting hydrocyanic acid mixed gas made by adopting an Ann method with methylmercapto propionaldehyde to obtain a 2-hydroxyl-4-methylmercapto-butyronitrile reaction system under the catalytic action of organic alkali; and sufficiently reacting the 2-hydroxyl-4-methylmercapto-butyronitrile reaction system with ammonium bicarbonate in a water medium to obtain 5-(2-methylmercapto-ethyl)-hydantoin. Due to adoption of raw materials which are not rectified or purified, the method disclosed by the invention is short in production time, high in production efficiency and low in production cost; the prepared 2-hydroxyl-4-methylmercapto-butyronitrile reaction system is steady in property and can be stored for a long time; and 5-(2-methylmercapto-ethyl)-hydantoin with high purity and high yield can be obtained through simple separation and purification operations under the synergistic effect of other substances in reaction liquid.