| http://www.w3.org/ns/prov#value | - Generally, the aldehydes are preferred each to account for not more than 10 weight ppm, based on the total weight of the acrylic acid. [0057] The aldehyde treating agent to be used in this invention is not particularly restricted but only required to be a compound which is used for the purpose of removing the aldehyde contained in the acrylic acid-containing liquid and refining the acrylic acid.
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