Process for extractively separating a mixture containing phospho

Details Process for extractively separating a mixture containing phospho Process for extractively separating a mixture containing phospho

1981-12-04

1983-10-18

Sutto, Anton H.

Chemistry of carbon compounds

Dipeptides, e.g., aspartame, anserine, carnosine, etc.

260963, C07F 909

Patent

active

044104669

ABSTRACT:
The invention relates to a process for separating a mixture containing phosphoric acid monoalkylesters, phosphoric acid dialkylesters and minor proportions of diphosphoric acid dialkylesters, each with 6 to 12 carbon atoms in the alkyl radical, by extractively distributing them between an aliphatic or aromatic hydrocarbon as an unpolar solvent and a polar solvent. To this end, the invention provides: for the ester mixture to be admixed with the quantity of water stoichiometrically necessary for hydrolyzing the P-O-P-bond of the diphosphoric acid dialkylester with the resultant formation of the phosphoric acid monoalkylester; for the whole to be maintained for at least 1 hour at temperatures higher than 60.degree. C.; for the partially hydrolyzed ester mixture to be treated in a countercurrent apparatus comprising n-stages with the solvents immiscible or partially miscible with one another so as to ensure introduction of pure solvent into stage 1 and stage n, respectively, and the introduction of partially hydrolyzed mixture into one of the stages 2 to (n-1), n standing for a whole number of at least 3.

REFERENCES:
Stewart et al., "Jou. Am. Chem. Soci." vol. 73, (1951) 1377-1378.
Kosolapoff et al. "Organic Phosphorus Compounds," vol. 6, (1973), pp. 229-230.

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