JPS54132521A - Preparation of colorless methionine - Google Patents
Preparation of colorless methionineInfo
- 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
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
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) |
-
1978
- 1978-04-04 JP JP4008878A patent/JPS54132521A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS5715838B2 (en) | 1982-04-01 |
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