# US 2014/0155652 A1 · Method of producing methionine

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- Number: US 2014/0155652 A1
- Document ID: US20140155652A1
- Status: Published application
- Kind: A1
- Application number: 14/082,542
- Filed: 2013-11-18
- Published: 2014-06-05
- Earliest claimed: 2012-12-04
- Assignees: Sumitomo Chemical Company, Limited
- Applicants: Sumitomo Chemical Company, Limited
- Inventors: Naoya YAMASHIRO; Junichi NISHIDA; Yoshiyuki KOIZUMI
- Web page: https://patentgrep.com/patent/US20140155652A1

## CPC

- C07C 319/12: by reactions not involving the formation of mercapto groups
- C07C 319/20: by reactions not involving the formation of sulfide groups
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS

## Abstract

The invention provides the following method capable of producing methionine in a shorter time by making rapid progress of the hydrolysis of 5-(2-methylmercaptoethyl)hydantoin from an aqueous 5-(2-methylmercaptoethyl)hydantoin solution containing ammonia component. A method of producing methionine is the method comprising hydrolyzing 5-(2-methylmercaptoethyl)hydantoin in an aqueous 5-(2-methylmercaptoethyl)hydantoin solution containing ammonia component, wherein the hydrolysis is performed after the ammonia component is removed from the aqueous solution.

## Claims

### Claim 1

A method of producing methionine, the method comprising hydrolyzing 5-(2-methylmercaptoethyl)hydantoin in an aqueous 5-(2-methylmercaptoethyl)hydantoin solution containing ammonia component, wherein the hydrolysis is performed after the ammonia component is removed from the aqueous solution.

### Claim 2 (depends on 1)

The production method according to claim 1, wherein the aqueous 5-(2-methylmercaptoethyl)hydantoin solution containing ammonia component is a reaction solution obtained after 3-methylmercaptopropionaldehydecyanhydrin is reacted with a carbonic acid component and an excess amount of an ammonia component in the presence of water.

### Claim 3 (depends on 1)

The production method according to claim 1, wherein the ammonia component is removed by blowing inert gas into the aqueous 5-(2-methylmercaptoethyl)hydantoin solution containing ammonia component.