Method for production of purified (meth)acrylic acid

Details Method for production of purified (meth)acrylic acid Method for production of purified (meth)acrylic acid

2009-06-01

2011-10-25

Puttlitz, Karl J (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acids and salts thereof

Reexamination Certificate

active

08044238

ABSTRACT:
The present invention relates to reducing corrosion of distillation equipment during azeotropic distillation of (meth)acrylic acid in the presence of dissolved copper, by providing aqueous (meth)acrylic acid having not more than 0.1% by weight formaldehyde, based on the total weight of the aqueous (meth)acrylic acid. The source of the copper may, for example, be copper-based polymerization inhibitors added to the aqueous (meth)acrylic acid and/or distillation equipment.

REFERENCES:
patent: 2001/0016668 (2001-08-01), Mitsumoto et al.
patent: 2006/0142613 (2006-06-01), Yada et al.

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