Kao Corporation

Yasuo Amishige

Takeshi Shirasawa

Akira Matsunaga

Akira Sakaguchi

Toku Fujioka

Takeshi Nakai

Kaoru Omae

A method for producing polyoxyalkylene alkyl ether carboxylic acid or a salt thereof includes an oxidation reaction process of oxidizing polyoxyalkylene alkyl ether with oxygen by supplying an oxygen-containing gas to a suspension or a solution that has a depth of 200 mm or more and includes polyoxyalkylene alkyl ether. In the oxidation reaction process, a supply rate of the oxygen-containing gas is reduced in a period in which the conversion is greater than or equal to 50% and less than 70%.

Method for producing polyoxyalkylene alkyl ether carboxylic acid or salt thereof

The present invention provides a method for producing polyoxyalkylene alkyl ether carboxylic acid and a salt thereof, including supplying polyoxyalkylene alkyl ether, oxygen, and water to a continuous stirred tank reactor containing a noble metal catalyst to oxidize the polyoxyalkylene alkyl ether with oxygen, in which the molar ratio of the salt of polyoxyalkylene alkyl ether carboxylic acid to the polyoxyalkylene alkyl ether in the continuous stirred tank reactor is controlled to 0.33 to 49.

Method for producing polyoxyalkylene alkyl ether carboxylic acid and salt thereof

A material for water gas contains polyhydric alcohol, and hydroxycarboxylic acid.

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Wakayama, Japan

Yasuo Amishige