Process for the preparation of alkali-metal salts of carboxyalko

Details Process for the preparation of alkali-metal salts of carboxyalko Process for the preparation of alkali-metal salts of carboxyalko

1980-03-10

1981-09-29

Killos, Paul J.

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

Organic compounds

Carboxylic acids and salts thereof

2604299, C07C 5922

Patent

active

RE0307556

ABSTRACT:
It is disclosed that high purity alkali metal salts of carboxyalkoxy succinic acid are produced from maleic acid and a hydroxy organic acid by reaction of zinc or alkaline earth metal salts of said acids to form a zinc or alkaline earth metal carboxyalkoxy succinate, by reacting the zinc or alkaline earth metal carboxyalkoxy succinate with an alkali metal carbonate in a stoichiometric deficiency of carbonate to selectively react with the alkaline earth metal carboxyalkoxy succinate, leaving the impurities as insoluble alkaline earth metal salts, removing the zinc or alkaline earth metal as insoluble carbonate, and recovering an alkali metal carboxyalkoxy succinate solution which is then evaporated to dryness.

REFERENCES:
patent: 3692685 (1972-09-01), Lambert et al.

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