Carboxylic anhydride process

Details Carboxylic anhydride process Carboxylic anhydride process

1987-12-21

1989-08-08

Raymond, Richard L.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

549235, 549236, 549245, 549248, 549250, 549253, 549256, 549257, 549258, 549259, 549260, C07D30789

Patent

active

048554570

ABSTRACT:
In accordance with the process of this invention, an improved catalyst for molecular oxidation of a hydrocarbon to form the corresponding carboxylic anhydrides is prepared by the steps of (a) forming a catalyst precursor by depositing on titanium dioxide solids in the anatase form at least a monolayer amount of at least one vanadium oxide source which is convertible to vanadium oxide upon calcining; (b) calcining the thus-formed catalyst precursor under conditions sufficient to convert the tantalum oxide source into the oxide form; (c) depositing upon the calcined catalyst precursor a catalytically effective amount of at least one vanadium oxide source which is convertible into vanadium oxide upon heating and at least one metal oxide source selected from the group consisting of oxides of Sb, Ga, Ge, In, T.sub.1, Pb, Se, Te, P and Bi, which is convertible into the corresponding metal oxide upon heating and which is reactive with V.sub.2 O.sub.5 ; and (d) calcining the vanadium and reactive metal-containing catalyst solids under conditions sufficient to form the corresponding vanadium oxide and reactive metal oxides.
The vanadium source and reactive metal source are employed in amounts sufficient to provide a molar ratio of vanadium to reactive metal of at least about 1:1, and preferably from about 1:1 to 6:1 gram atoms of vanadium per gram atom of reactive metal in the total catyalst, and wherein the combined weight percent of vanadium and the reactive metal (based on the oxides thereof), based on total catalyst weight is about 5 to 10 wt. %, and preferably from about 6 to 8 wt. %.
Preferably, the catalysts of the present invention are prepared by depositing on the calcined catalyst precursor, i.e. in step (c) above, sources of vanadium and reactive metal oxides in amounts sufficient to provide a molar ratio of vanadium deposited in step (c) to the reactive metal which is co-deposited therewith of at least about 1:1, and preferably from about 1:1 to about 4:1, gram atoms of vanadium per gram atom of the reactive metal; and wherein the combined weight percent, based on total catalyst weight, of vanadium added in step (c) and reactive metal co-deposited therewith (based on the oxides thereof) is from about 3 to about 9 wt. %, and more preferably from about 4 to about 6 wt. %.

REFERENCES:
patent: 4582912 (1986-04-01), Saleh et al.

Affiliated with

Also associated with

Rating

Carboxylic anhydride process does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Carboxylic anhydride process, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Carboxylic anhydride process will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-906907