FR2149185A5 - Dl methionine synthesis - from 3-methylthio-propionaldehyde - Google Patents
Dl methionine synthesis - from 3-methylthio-propionaldehydeInfo
- Publication number
- FR2149185A5 FR2149185A5 FR7227954A FR7227954A FR2149185A5 FR 2149185 A5 FR2149185 A5 FR 2149185A5 FR 7227954 A FR7227954 A FR 7227954A FR 7227954 A FR7227954 A FR 7227954A FR 2149185 A5 FR2149185 A5 FR 2149185A5
- Authority
- FR
- France
- Prior art keywords
- pref
- degrees
- methylthio
- propionaldehyde
- h2so4
- 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.)
- Expired
Links
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Prodn. of DL-methionine (I) is by reacting (pref. for 1-3 hrs. at 30-60 degrees C.) 3-methylthiopropionaldehyde (II), HCN (or salt such as NaCN), and NH3 (or an aq. soln. of NH3 contng. an ammonium salt) to form 3-methylthio-1-amino propionitrile (III). Excess NH3 and volatile impurities are removed by applying a vacuum (pref. 200 mm. Hg.) at 30-60 degrees C. until the NH3 content is 5%. Volatile impurities are pref. eliminated by an alkaline wash and the NH3 is recovered for recycling by absorption in water. The resulting reaction mixture (two layers) is hydrolysed by H2SO4 at 30 degrees C. using a ratio of H2SO4 : (III) of 2.4 : 1 to 3 : 1, the product is then neutralised with aq. NH3 to give (I).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES393824A ES393824A1 (en) | 1971-07-31 | 1971-07-31 | Procedure for obtaining methionine. (Machine-translation by Google Translate, not legally binding) |
Publications (1)
Publication Number | Publication Date |
---|---|
FR2149185A5 true FR2149185A5 (en) | 1973-03-23 |
Family
ID=8458908
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7227954A Expired FR2149185A5 (en) | 1971-07-31 | 1972-07-28 | Dl methionine synthesis - from 3-methylthio-propionaldehyde |
Country Status (3)
Country | Link |
---|---|
ES (1) | ES393824A1 (en) |
FR (1) | FR2149185A5 (en) |
IT (1) | IT976425B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4319044A (en) * | 1979-01-25 | 1982-03-09 | Sumitomo Chemical Company, Limited | Process for recovering useful components from waste gas of methionine synthesis |
-
1971
- 1971-07-31 ES ES393824A patent/ES393824A1/en not_active Expired
-
1972
- 1972-07-27 IT IT69453/72A patent/IT976425B/en active
- 1972-07-28 FR FR7227954A patent/FR2149185A5/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4319044A (en) * | 1979-01-25 | 1982-03-09 | Sumitomo Chemical Company, Limited | Process for recovering useful components from waste gas of methionine synthesis |
Also Published As
Publication number | Publication date |
---|---|
IT976425B (en) | 1974-08-20 |
ES393824A1 (en) | 1973-08-16 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |