Process for the calcination/activation of V/P/O catalyst

Details Process for the calcination/activation of V/P/O catalyst Process for the calcination/activation of V/P/O catalyst

1997-09-30

1999-04-20

Dentz, Bernard

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

502209, C07D30760

Patent

active

058958215

ABSTRACT:
An improved process for calcination and activation of a catalyst containing mixed oxides of vanadium and phosphorus (V/P/O) involving the addition of spray dried catalyst precursor to a fluidizing oxygen containing gas at a controlled rate such that the temperature is maintained at a range of 370 to 410.degree. C. (preferably 390.+-.5.degree. C.). The catalyst precursor experiences, in addition to rapid temperature rise, dehydration/calcination at this elevated temperature in the fluidized state for an average range of residence time of less than about 4 hours at 3.5 atm of air or above, and up to 20 hours at 1 atm of air while simultaneously and continuously maintaining an average V.sub.ox of 4.55 or less. Such a process is useful in preparing a V/P/O catalyst that exhibits enhanced activity for the oxidation of n-butane to maleic anhydride. The novel process also provides an improved method for start-up of a commercial scale recirculating solids reactor.

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patent: 4748140 (1988-05-01), Blum et al.
patent: 5021588 (1991-06-01), Contractor
patent: 5573992 (1996-11-01), Contractor et al.

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