Method for production of aqueous (meth)acrylic acid

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

08044237

ABSTRACT:
The present invention relates to recovery of aqueous (meth)acrylic acid by condensation of a (meth)acrylic acid-containing stream to produce aqueous (meth)acylic acid having a higher concentration of (meth)acrylic acid and a lower concentration of formaldehyde, i.e., not more than 0.1 weight %, than the aqueous (meth)acrylic acid produced using hithertofore known separation methods. The (meth)acrylic acid-containing stream may be the raw product stream of catalytic oxidation at least one C2-C4alkane or alkene.

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

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