C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
99/24.1, 260/526
C07C 323/52 (2006.01) A01N 37/02 (2006.01) A23K 1/16 (2006.01) A23K 1/22 (2006.01) C07C 327/06 (2006.01) C12P 11/00 (2006.01)
Patent
CA 1263668
LIQUID 2-HYDROXY-METHYLTHIOBUTYRIC ACID AND PROCESS FOR THE PREPARATION THEREOF ABSTRACT OF THE DISCLOSURE 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 hydrolzyed 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-methylthio- butyramide. 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-methylthio- butyric acid transferred from the hydrolyzate. The acid product is then recovered from the extract.
467699
Ruest Dennis Anna
Takano Masaharu
Wolf Lawrence Russell
Mcfadden Fincham
Novus International Inc.
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