Preparation of 2,2'-oxydisuccinate

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

1990-11-15

1992-12-15

Dees, Jose G.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acids and salts thereof

C07C 59305

Patent

active

051718863

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 6. The precipitated sodium hydrogen maleate salts are recycled to the synthesis reaction as salts of malic acid by hydration in the presence of a hydration catalyst to prepare additional amounts of product.

REFERENCES:
patent: 3635583 (1972-01-01), Lamberti et al.
patent: 3692685 (1972-09-01), Lamberti et al.
patent: 3914297 (1975-10-01), Lamberti et al.
patent: 4798907 (1989-01-01), Macbrair, Jr. et al.
patent: 4959496 (1990-09-01), Crutchfeld et al.
Hydroxy Dicarboxylic Acids, J. H. Van Ness, vol. 13, pp. 103-120, 1965.
Kinetics of the Acid Catalysis of the Hydration of Fumaric Acid to Malic Acid, Lee T. Rozelle & Robert A. Alberty, Dec. 1957, pp. 1637-1640.

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