Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Metal – metal oxide or metal hydroxide
Reexamination Certificate
2006-03-02
2009-11-10
Dentz, Bernard (Department: 1625)
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Metal, metal oxide or metal hydroxide
C502S353000, C549S248000, C549S249000
Reexamination Certificate
active
07615513
ABSTRACT:
The present invention relates to the use of a catalyst comprising at least one first catalyst zone located towards the gas inlet, a second catalyst zone located closer to the gas outlet and a third catalyst zone located even closer to or at the gas outlet for the preparation of phthalic anhydride by gas-phase oxidation of o-xylene and/or naphthalene, with the catalyst zones preferably each having an active composition comprising TiO2, characterized in that the catalyst activity of the first catalyst zone is higher than the catalyst activity of the second catalyst zone. Furthermore, a preferred process for the preparation of phthalic anhydride is described.
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Towae, et al., “Phthalic Acid and Derivatives”, Ullmann's Encyclopedia of Industrial Chemistry, vol. A20, 1992, pp. 181-211.
Dialer Harald
Estenfelder Marvin
Guckel Christian
Pitschi Werner
Cox Scott R.
Dentz Bernard
Süd-Chemie AG
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