Preparation of acrylic acid

Details Preparation of acrylic acid Preparation of acrylic acid

2005-09-06

2005-09-06

Richter, Johann (Department: 1621)

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

Organic compounds

Carboxylic acids and salts thereof

C562S523000, C562S524000, C562S527000, C562S530000, C562S531000, C562S532000, C562S537000, C562S538000, C562S542000, C562S544000

Reexamination Certificate

active

06939991

ABSTRACT:
In a process for preparing acrylic acid, an acrylic acid-containing product gas mixture obtained by catalytic gas phase partial oxidation of a C3precursor of acrylic acid, after direct cooling with a quench liquid, is fractionally condensed in a separating column provided with internals, rising into itself with sidestream takeoff of crude acrylic acid, and the acrylic acid oligomers which form are dissociated and the resulting dissociation gas is subjected to a countercurrent rectification before it is recycled.

REFERENCES:
patent: 6498272 (2002-12-01), Schroder et al.
patent: 199 24 532 (2000-11-01), None
patent: 199 24 533 (2000-11-01), None
patent: 101 56 016 (2003-06-01), None
patent: 102 35 847 (2003-08-01), None
patent: 102 23 058 (2003-12-01), None
patent: 102 43 625 (2004-04-01), None
patent: WO 01/77056 (2001-10-01), None

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