Process for the preparation of alkali metal salts of...

Details Process for the preparation of alkali metal salts of... Process for the preparation of alkali metal salts of...

C - Chemistry, Metallurgy

07

C

260/522.2

C07C 51/373 (2006.01) C07C 51/367 (2006.01) C07C 59/305 (2006.01)

Patent

CA 1315291

05-21(6804)A ABSTRACT There is disclosed herein improved processes for the preparation of mixtures of alkali metal salts of 1-hydroxy-3-oxa-1,2,4,5-pentane tetracarboxylate and alkali metal salts of 3,6-dioxa-1,2,4,5,7,8-octane hexacarboxylate wherein D,L-tartaric acid is employed and recovered by lowering the pH of the reaction median to within the range of from about 7 to about 9.5. At the reduced pH calcium D,L-tartrate precipitates and is easily separated. The recovered tartrate may be recycled to the synthesis reaction to prepare further product.

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