Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof
Reexamination Certificate
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.
Briegel Keith F.
DeCourcy Michael Stanley
Elder James
Juliette James Jerrick
Mendoza Joy Lydon
Bodner Marcella M.
Puttlitz Karl J
Rohm and Haas Company
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