Heterogeneously catalyzed partial gas phase oxidation of...

Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof

Reexamination Certificate

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Reexamination Certificate

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06888024

ABSTRACT:
In a process for heterogeneously catalyzed partial gas phase oxidation of propene to acrylic acid, the starting reaction gas mixture is oxidized at a propene loading of <160 l(STP)/l·h in a first reaction stage over a fixed catalyst bed1which is accommodated in two successive reaction zones A, B, and the acrolein-containing product gas mixture of the first reaction stage is subsequently oxidized in a second reaction stage over a fixed catalyst bed2which is a accommodated in two successive reaction zones C, D, the highest temperature of the reaction gas mixture within reaction zone A being above the highest temperature of the reaction gas mixture within reaction zone B and the highest temperature of the reaction gas mixture within reaction zone C being above the highest temperature of the reaction gas mixture within reaction zone D.

REFERENCES:
patent: 6395936 (2002-05-01), Arnold et al.
patent: 6525217 (2003-02-01), Unverricht et al.
patent: 199 48 241 (2001-04-01), None
patent: 199 48 248 (2001-04-01), None
patent: 199 48 523 (2001-04-01), None
patent: 199 55 168 (2001-05-01), None
patent: 1 106 598 (2001-06-01), None
patent: 199 10 506 (2000-09-01), None
patent: 199 27 624 (2000-12-01), None
patent: WO 0136364 (2001-05-01), None

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