Method for production of aqueous (meth)acrylic acid
AssigneeRohm and Haas Company
InventorsKeith F. Briegel, Michael Stanley DeCourcy, James Elder, James Jerrick Juliette, Joy Lydon Mendoza
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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-C4 alkane or alkene.
Claims8
A method for producing aqueous acrylic acid from a gaseous material stream comprising:
- a) providing a gaseous stream to a condenser, wherein the gaseous material stream comprises at least acrylic acid, water, formaldehyde;
- and
- b) operating the condenser and producing a gaseous vent stream comprising uncondensed components, and a condensed aqueous acrylic acid stream comprising acrylic acid,
- wherein the aqueous acrylic acid stream comprises not more than 0.1% by weight formaldehyde, based on the total weight of the aqueous acrylic acid stream, and wherein the balance of the formaldehyde originally in the gaseous material stream is contained in the gaseous vent stream.
Dependencies are inferred from the claim text.