Preparation of N-acylamino carboxylic acids and N-acylamino sulfonic acids and their alkali metal salts

Abstract

N-acylamino carboxylic acids and N-acylamino sulfonic acids and their alkali metal salts from the technical alkali metal salts of amino carboxylic acids and amino sulfonic acids, respectively, with an active content of 50-95% by weight, based on the solids content of the technical alkali metal salts, and from alkyl carboxylates, are prepared by (a) preparing a suspension of the solid anhydrous technical alkali metal salts of the amino carboxylic acids or amino sulfonic acids in the alkyl carboxylates, (b) reacting this suspension by adding more than 30 to 150 mol % of strong bases to give the alkali metal salts of the N-acylamino carboxylic acids or N-acylamino sulfonic acids, and (c) if required preparing therefrom the free N-acylamino carboxylic acids or N-acylamino sulfonic acids in a conventional way by adding acids.

Dependencies are inferred from the claim text.