Method for purifying (meth)acrylic acid by oxidising a...

Details Method for purifying (meth)acrylic acid by oxidising a... Method for purifying (meth)acrylic acid by oxidising a...

2007-08-07

2007-08-07

Zucker, Paul A. (Department: 1621)

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

Organic compounds

Carboxylic acids and salts thereof

Reexamination Certificate

active

10577415

ABSTRACT:
The present invention relates to a method for purifying (meth)acrylic acid obtained by oxidizing propane, propylene, acrolein, isobutane, isobutene, ter-butyl alcohol, (meth)acrolein and 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 (2) from the bottom of column (C1) to a light component separation column (C2) and sending the flow from the base of column (C2), stream (4) to a separation device made up of three sections, exhaustion (S1), concentration (S2) and rectification (S3) respectively in order to extract pure (meth)acrylic acid.”

REFERENCES:
patent: 3932500 (1976-01-01), Duembgen et al.
patent: 5426221 (1995-06-01), Willersinn
patent: 5705688 (1998-01-01), Fauconet et al.
patent: 5780679 (1998-07-01), Egly et al.
patent: 5780688 (1998-07-01), Hoffmann et al.

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