METHOD FOR PRODUCING POLYOXYALKYLENE ALKYL ETHER CARBOXYLIC ACID OR SALT THEREOF

摘要

This method for producing a polyoxyalkylene alkyl ether carboxylic acid or a salt thereof has an oxidation reaction step of oxygen oxidation of a polyoxyalkylene alkyl ether by supplying an oxygen-containing gas into a suspension or a solution which has a depth of 200 mm or more and contains a polyoxyalkylene alkyl ether. In the oxidation reaction step, the supply rate of the oxygen-containing gas is reduced when the reaction rate is 50% or more and less than 70%.