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Preparation of ether-carboxylic acids and salts, useful as mild detergent in laundry and cosmetic formulations, uses more than amount of alkali in oxalkylation and Williamson alkylation
Preparation of ether-carboxylic acids and salts, useful as mild detergent in laundry and cosmetic formulations, uses more than amount of alkali in oxalkylation and Williamson alkylation
Preparation of ether-carboxylic acids (I) or their alkali(ne earth) salts containing little residual alcohol comprises converting a mono- or polyhydric alcohol into the alcoholate with 5-95 mole% alkali(ne earth) hydroxide or alkali metal alcoholate; removing the water or alcohol of reaction; reaction with alkylene oxide; direct alkylation of the alkaline mixture with a chloroacetic acid derivative; and optional acidification. Preparation of ether-carboxylic acids (I) or their alkali(ne earth) salts with a low residual alcohol content comprises converting a mono- or polyhydric alcohol into the corresponding alcoholate with a sub-stoichiometric amount of 5-95 mole% basic compound selected from alkali(ne earth) hydroxides and alkali metal alcoholates; removing the water or alcohol of reaction from the mixture; reaction with alkylene oxide; direct alkylation of the highly alkaline reaction mixture, containing over 5 mole% oxalkylated alcoholate, with a chloroacetic acid derivative, after removing the residual alcohol by distillation if necessary; and optional conversion to the free acid (I) by acidification with mineral acid.
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