Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof
Reexamination Certificate
2005-05-03
2005-05-03
Richter, Johann R. (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acids and salts thereof
C562S598000, C562S531000, C562S532000, C562S538000, C562S542000
Reexamination Certificate
active
06888026
ABSTRACT:
An object of this invention is to provide a method for producing acrylic acid that enables to suppress adverse influence of byproducts during distillation and to accomplish long-term continuous operation of the acrylic acid production apparatus. This invention is directed to a method for producing (meth)acrylic acid comprising the step of isolating (meth)acrylic acid from a liquid containing (meth)acrylic acid by distillation wherein the liquid contains glyoxal (including its hydrate) in a concentration of 0.1 mass % or less.
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Nakae Tomohiro
Ohkouchi Kazuo
Sakamoto Kazuhiko
Nippon Shokubai Co. , Ltd.
Puttlitz Karl
Richter Johann R.
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