Method for producing polyoxyalkylene alkyl ether carboxylic acid or salt thereof
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United States of America Patent
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Jan 12, 2016
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Jan 22, 2015
app pub date -
Nov 27, 2012
filing date -
Dec 28, 2011
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Abstract
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%.
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