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

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

C - Chemistry, Metallurgy

07

C

260/486.2, 260/5

C07C 59/265 (2006.01) C07C 51/09 (2006.01) C07C 69/67 (2006.01) C07C 69/704 (2006.01)

Patent

CA 1059144

ABSTRACT OF THE DISCLOSURE Process for the preparation of citric esters, citric acid or the salts of citric acid, characterized in that the cy- anohydrin of acetone dicarboxylic diester in the presence of an inert halogenated solvent is brought into reaction at a temperature not higher than 50°C with 1 to 3 molar equivalents of an aliphatic alcohol having 1 to 4 carbon atoms and at least 2 molar equivalents of anhydrous HCl, followed successively by removing the excess HCl, adding water to obtain a two-layer system, heating, separating the organic layer and isolating the triester of citric acid from the layer, after which by hydrolysis in acid or an alkaline medium the triester may be converted into citric acid or the salt of citric acid and be isolated as such.

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