Preparation of 2,2'-oxydisuccinate

Details Preparation of 2,2'-oxydisuccinate Preparation of 2,2'-oxydisuccinate

C - Chemistry, Metallurgy

07

C

C07C 51/367 (2006.01) C07C 59/305 (2006.01) C11D 3/20 (2006.01)

Patent

CA 2055540

05-21(7781)A PREPARATION OF 2.2'-OXYDISUCCINATE ABSTRACT There is disclosed herein an improved processes for the preparation of oxydisuccinate by reacting in an alkaline reaction medium the salts of maleic acid and malic acid in the presence of a calcium ion catalyst wherein unreacted maleic acid salts are recovered from the reaction medium as sodium hydrogen maleate by lowering the pH of the reaction product to a range of from about 4 to about 6 The precipitated sodium hydrogen maleate salts are recycled to the synthesis reaction as salts of malic acid by hydration to prepare additional amounts of product.

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