Chemistry of carbon compounds – Dipeptides – e.g. – aspartame – anserine – carnosine – etc.
Patent
1977-05-10
1980-06-24
Sutto, Anton H.
Chemistry of carbon compounds
Dipeptides, e.g., aspartame, anserine, carnosine, etc.
C07F 9165
Patent
active
042094712
ABSTRACT:
A liquid-liquid extraction method for recovering O,O-di(lower)alkyldithiophosphoric acid of increased purity from a crude mixture in which it is contained comprises intimately contacting said mixture with an acidic aqueous solution to form two liquid phases whereby the concentration of the thiophosphoric acid in the aqueous phase is increased; separating the two phases; contacting the aqueous phase with a stable, water-immiscible, volatile, organic solvent to form two liquid phases whereby the concentration of the thiophosphoric acid in the organic solvent is increased; separating the two phases; and vaporizing the organic solvent to recover high purity O,O-di(lower)alkyl dithiophosphoric acid.
REFERENCES:
patent: 2335511 (1943-11-01), Havemann et al.
patent: 3573293 (1971-03-01), Wiese
Kirk-Othmer, "Encyclopedia of Chemical Technology", p. 322.
Dube James H.
Miller Ralph
Ciba-Geigy Corporation
Jorda Karl F.
Sutto Anton H.
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