Polyoxyalkylene alkyl ether carboxylic acids and salts thereof The method for producing

The present invention provides a polyoxyalkylene alkyl ether carboxylic acids and salts thereof The method for producing polyethylene, which, using a continuous stirred tank reactor, the catalyst in the liquid phase is supplied to the noble metal-containing polyoxyalkylene alkyl ethers, oxygen, and water , the polyoxyalkylene alkyl ether is oxidized with oxygen to produce polyoxyalkylene alkyl ether carboxylic acids and salts thereof, when the control reacting polyoxyalkylene alkyl ether carboxylate in a continuous stirred tank reactor relative in the molar ratio of polyoxyalkylene alkyl ether is 0.33 to 49.