Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof
Patent
1988-08-24
1990-09-25
Gray, Bruce
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acids and salts thereof
C07C 5923
Patent
active
049594966
ABSTRACT:
There is disclosed herein improved processes for the preparation of ether carboxylates by reacting in an alkaline reaction medium the salts of maleic acid and a carboxylic or polycarboxylic acid having a reactive hydroxyl group on a non-carbonyl carbon atom in the presence of a calcium ion catalyst wherein unreacted acid salts are recovered from the reaction medium by lowering the pH of the reaction medium to a range of from about 4 to about 6. The precipitated salts are recycled to the synthesis reaction to prepare additional amounts of product.
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Crutchfield Marvin M.
Horng Liou-Liang
Schultz Robert G.
Cole Arnold H.
Gray Bruce
Loyer Raymond C.
Monsanto Company
Shear Richard H.
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