JPS54132521A - Preparation of colorless methionine - Google Patents

Preparation of colorless methionine

Info

Publication number
JPS54132521A
JPS54132521A JP4008878A JP4008878A JPS54132521A JP S54132521 A JPS54132521 A JP S54132521A JP 4008878 A JP4008878 A JP 4008878A JP 4008878 A JP4008878 A JP 4008878A JP S54132521 A JPS54132521 A JP S54132521A
Authority
JP
Japan
Prior art keywords
acid
methionine
methylmercaptoethylhydantoin
reducing agent
aqueous solution
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP4008878A
Other languages
Japanese (ja)
Other versions
JPS5715838B2 (en
Inventor
Toshio Kawabata
Toshio Ishiyama
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Chemical Co Ltd
Original Assignee
Sumitomo Chemical Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sumitomo Chemical Co Ltd filed Critical Sumitomo Chemical Co Ltd
Priority to JP4008878A priority Critical patent/JPS54132521A/en
Publication of JPS54132521A publication Critical patent/JPS54132521A/en
Publication of JPS5715838B2 publication Critical patent/JPS5715838B2/ja
Granted legal-status Critical Current

Links

Abstract

PURPOSE: To obtain colorless methionine without the decoloring process, by the alkaline hydrolysis of β-methylmercaptoethylhydantoin adding a small amount of a reducing agent to the crude methionine obtained by hyantoin reaction.
CONSTITUTION: The reaction of acrolein and methylmercaptane gives β-methylmercaptopropionaldehyde which is then made to react with hydrocyanic acid and ammonium bicarbonate to afford a 2W20wt% aqueous solution of β-methylmercaptoethylhydantoin. The aqueous solution is subjected to the alkaline hydrolysis adding a reducing agent of, e.g. sulfurous acid salt in an amount of 0.001W1.5mol per 1 mol of β-methylmercaptoethylhydantoin, and then neutralized to precipitate methionine. The methionine is crystallized and isolated. The reducing agent used is a salt of sulfurous acid, hydrosulfurous acid, disulfurous acid, thiosulfuric acid or dithionous acid, or a sulfur dioxide gas.
COPYRIGHT: (C)1979,JPO&Japio
JP4008878A 1978-04-04 1978-04-04 Preparation of colorless methionine Granted JPS54132521A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4008878A JPS54132521A (en) 1978-04-04 1978-04-04 Preparation of colorless methionine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4008878A JPS54132521A (en) 1978-04-04 1978-04-04 Preparation of colorless methionine

Publications (2)

Publication Number Publication Date
JPS54132521A true JPS54132521A (en) 1979-10-15
JPS5715838B2 JPS5715838B2 (en) 1982-04-01

Family

ID=12571128

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4008878A Granted JPS54132521A (en) 1978-04-04 1978-04-04 Preparation of colorless methionine

Country Status (1)

Country Link
JP (1) JPS54132521A (en)

Also Published As

Publication number Publication date
JPS5715838B2 (en) 1982-04-01

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