Preparation of oxydicarboxylic acid salts

Details Preparation of oxydicarboxylic acid salts Preparation of oxydicarboxylic acid salts

1977-06-16

1978-08-29

Killos, Paul J.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260535P, C07C 5912

Patent

active

041103718

ABSTRACT:
Oxyethylene dicarboxylic acid alkali metal salts are prepared from the corresponding oxydiethylene or polyoxyethylene diol and an aqueous alkali metal hydroxide in the presence of a catalytically effective amount of a nickel-copper-chromia catalyst at temperatures from about 200 to 300.degree. C. and pressures sufficient to maintain the reactants and products substantially in liquid phase. Preferably, the disodium salt of oxydiacetic acid is prepared by the oxidation of diethylene glycol with an aqueous sodium hydroxide solution in the presence of a catalytically effective amount of the nickel-copper-chromia catalyst. The disodium oxydiacetate can be readily precipitated from the crude reaction mixture by addition of a mixture of methoanol-isopropanol with subsequent filtration.

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patent: 3790625 (1974-02-01), Vogt et al.
patent: 3870749 (1975-03-01), Danesh

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