Method for purifying (meth)acrylic acid obtained by...

Details Method for purifying (meth)acrylic acid obtained by... Method for purifying (meth)acrylic acid obtained by...

2004-10-01

2009-11-24

Gonzalez, Porfirio Nazario (Department: 1621)

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

Organic compounds

Carboxylic acids and salts thereof

Reexamination Certificate

active

07622607

ABSTRACT:
The present invention relates to a method for purifying (meth)acrylic acid obtained by catalytic or redox oxidation of a gaseous substrate constituting propane, propylene, acrolein, isobutane, isobutene, tert-butyl alcohol and/or (meth)acrolein or mixtures thereof by sending the gaseous reaction mixture to the bottom of a countercurrent absorption column (C1) which is supplied at the top with at least one type of hydrophobic heavy solvent, sending the flow (4) from the bottom of column (C1) to a separation column (C2). Column (C1) is operated at a flow rate of heavy solvent of from 3 to 5.6 times the flow rate of the (meth)acrylic acid in the gaseous reaction mixture and the rectifying column used as a separation column (C2) is operated with the feed at the top and without reflux.

REFERENCES:
patent: 3868417 (1975-02-01), Duembgen et al.
patent: 3932500 (1976-01-01), Duembgen et al.
patent: 5426221 (1995-06-01), Willersinn
patent: 5780679 (1998-07-01), Egly et al.
patent: 6713648 (2004-03-01), Hirao et al.
patent: 6888025 (2005-05-01), Hirao et al.

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