| US 7,518,015 B2 | ||
| Process for heterogeneously catalyzed gas phase partial oxidation of at least one organic starting compound | ||
| Ulrich Cremer, Mannheim (Germany); Ulrike Wegerle, Worms (Germany); Gerhard Laqua, Mutterstadt (Germany); Ulrich Hammon, Mannheim (Germany); and Klaus Joachim Mueller-Engel, Stutensee (Germany) | ||
| Assigned to BASF Aktiengesellschaft, Ludwigshafen (Germany) | ||
| Filed on Dec. 19, 2006, as Appl. No. 11/612,824. | ||
| Claims priority of provisional application 60/756207, filed on Jan. 05, 2006. | ||
| Claims priority of application No. 10 2006 000 996 (DE), filed on Jan. 05, 2006. | ||
| Prior Publication US 2007/0155988 A1, Jul. 05, 2007 | ||
| Int. Cl. C07C 51/16 (2006.01) | ||
| U.S. Cl. 562—532 | 10 Claims |
| 1. A process for heterogeneously catalyzed gas phase partial oxidation of at least one organic starting compound comprising:
freshly installing into a reaction chamber, a bed of fixed catalyst;
conducting a reaction gas mixture comprising the at least one organic starting compound and molecular oxygen through the bed
of fixed catalyst;
removing heat of reaction by indirect heat exchange with a fluid heat carrier conducted outside the reaction chamber;
replacing a portion of the fixed catalyst bed by a replacement fixed catalyst bed part; wherein
the replacing a portion of the fixed catalyst bed takes place when with increasing operating time the activity of the fixed
catalyst bed is reduced,
the portion of the fixed catalyst bed replaced is not the entire fixed catalyst bed, and
a volume-specific activity of the replacement fixed catalyst bed part is lower than a volume-specific activity of the replaced
fixed catalyst bed part in its freshly installed state
wherein
dΔT=ΔTHBn−ΔTHBv, is ≤30° C.
wherein
ΔTHBn is the hotspot expansion of the fixed catalyst bed after the replacement by the replacement fixed catalyst bed part has been
carried out,
ΔTHBv is the hotspot expansion of the fixed catalyst bed before the replacement by the replacement fixed catalyst bed part has been
carried out, based on the same conversion of the organic starting compound in single pass of the reaction gas mixture through
the fixed catalyst bed and the same composition of the reaction gas mixture and the same loading of the fixed catalyst bed
with reaction gas mixture.
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