Drug – bio-affecting and body treating compositions – Designated organic active ingredient containing – Radical -xh acid – or anhydride – acid halide or salt thereof...
Patent
1983-11-14
1985-06-18
Trousof, Natalie
Drug, bio-affecting and body treating compositions
Designated organic active ingredient containing
Radical -xh acid, or anhydride, acid halide or salt thereof...
562581, 564129, A01N 3702, C07C14914
Patent
active
045240779
ABSTRACT:
A process for the preparation of 2-hydroxy-4-methylthiobutyric acid having improved color, odor and lower viscosity. 2-hydroxy-4-methylthiobutyric acid which is also known as 2-hydroxy-4-(methylthio) butanoic acid, is hydrolyzed with sulfuric acid having an initial strength of between about 50% by weight and about 70% by weight on an organic-free basis, thereby producing an intermediate aqueous hydrolysis product solution containing 2-hydroxy-4-methylthiobutyramide. The 2-hydroxy-4-methylthiobutyramide is hydrolyzed with sulfuric acid having a strength of between about 30% by weight and about 50% by weight on an organic-free basis to produce an aqueous hydrolyzate containing 2-hydroxy-4-methylthiobutyric acid. The hydrolyzate solution is contacted with a substantially water-immiscible organic solvent in a liquid-liquid extraction system to produce an extract comprising the solvent and 2-hydroxy-4-methylthiobutyric acid transferred from the hydrolyzate. The acid product is then recovered from the extract.
REFERENCES:
patent: 2745745 (1956-05-01), Blake et al.
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patent: 3175000 (1965-03-01), Gielkens et al.
patent: 3773927 (1973-11-01), Cummins
patent: 4310690 (1982-01-01), Cummins
Ruest Dennis A.
Takano Masaharu
Wolf Lawrence R.
Duffey William H.
Gray Bruce D.
Hoerner, Jr. Dennis R.
Monsanto Company
Trousof Natalie
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