Process for the preparation of citric acid esters, citric acid o

Details Process for the preparation of citric acid esters, citric acid o Process for the preparation of citric acid esters, citric acid o

1974-12-06

1976-04-13

Weinberger, Lorraine A.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260482P, 260534M, 260535P, C07C 5916

Patent

active

039503976

ABSTRACT:
A process is provided for making a triester of citric acid wherein the cyanohydrin of an acetone dicarboxylic acid diester is reacted with 1 to 3 molar equivalents of an aliphatic alcohol having 1 to 4 carbon atoms and at least two molar equivalents of anhydrous hydrogen chloride in an inert halogenated organic solvent for the cyanohydrin diester at not above 50.degree.C. to form an imino ether, removing excess hydrogen chloride, adding water to form a two-phase system, separating the organic and water phases and recovering the resulting triester from the organic phase. The triester may be hydrolyzed into citric acid or a salt of citric acid in an acid or alkaline medium.

REFERENCES:
patent: 3798266 (1974-03-01), Bottaccio et al.

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