Process for the production of acrylic acid

Details Process for the production of acrylic acid Process for the production of acrylic acid

2007-11-13

2007-11-13

Zucker, Paul A. (Department: 1621)

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

Organic compounds

Carboxylic acids and salts thereof

C562S547000

Reexamination Certificate

active

10498852

ABSTRACT:
The present invention relates to a process for the production of acrylic acid (AA) comprising the steps wherein: a) a 1st gas mixture comprising propylene, oxygen, an inert gas and steam is subjected to a 1st catalytic oxidation reaction stage thereby converting the propylene in the presence of a catalyst mainly into acrolein being contained in a 2nd gas mixture from said 1st catalytic oxidation reaction, b) said 2nd gas mixture from the 1st catalytic oxidation reaction stage is subjected to a 2nd catalytic oxidation reaction stage thereby converting the acrolein in the presence of a catalyst mainly into AA, being contained in a product gas, c) said product gas is subjected to a quench tower, wherein said AA is recovered as an aqueous solution comprising said AA being contained in the process water, wherein a process vent gas is obtained at the top of said quench tower, wherein, said 1st gas mixture has a steam/propylene ratio of >0.3 and <2 and, the amount of said process water is less or equal to the amount of water in said aqueous solution withdrawn from the quench tower.

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International Preliminary Examination Report mailed on Apr. 20, 2004 in PCT/EP02/14227.
International Search Report mailed on May 36, 2003 in PCT/EP02/14227.

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