Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Phosphorus or compound containing same
Reexamination Certificate
2007-01-30
2007-01-30
Dentz, Bernard (Department: 1625)
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Phosphorus or compound containing same
C549S259000
Reexamination Certificate
active
10507610
ABSTRACT:
A process for preparing a vanadium, phosphorus, and oxygen catalyst precursor for preparing maleic anhydride by heterogeneously catalyzed gas-phase oxidation of a hydrocarbon having at least four carbon atoms, which comprises(a) reacting vanadium pentoxide with from 102 to 110% strength phosphoric acid in the presence of a primary or secondary, noncyclic or cyclic, unbranched or branched, saturated alcohol having from 3 to 6 carbon atoms in a temperature range from 80 to 160° C.;(b) isolating the precipitate formed;(c) setting an organic carbon content of ≦1.1% by weight in the isolated precipitate by heat treatment in a temperature range from 250 to 350° C., the heat-treated product, following the addition of 3.0% by weight of graphite, giving a powder X-ray diffraction diagram which in the 2θ region features a ratio of the height of the peak of any pyrophosphate phase present at 28.5° to the height of the peak due to the graphite at 26.6° of ≦0.1; and(d) shaping the heat-treated product obtained from step (c) into particles having an averaged diameter of at least 2 mm;a catalyst precursor obtainable from this process; a process for preparing a catalyst from the catalyst precursor; a catalyst obtainable from that process; and also a process for preparing maleic anhydride over that catalyst.
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Ullmann's Encyclopedia of Industrial Chem., 6thEd., 2000 electronic release, Chapter “Malelic and Fumaric Acids”, Maleic Anhydride Production Kubias et al., 72(3), 2000, pp. 249-251.
Dobner Cornelia
Duda Mark
Storck Sebastian
Weiguny Jens
BASF - Aktiengesellschaft
Dentz Bernard
Novak Druce & Quigg LLP
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