Method for production of phthalic anhydride by vapor-phase oxida

Details Method for production of phthalic anhydride by vapor-phase oxida Method for production of phthalic anhydride by vapor-phase oxida

1992-10-23

1993-07-20

Dentz, Bernard

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D30789

Patent

active

052295273

ABSTRACT:
The production of phthalic anhydride by the catalytic vapor-phase oxidation of a mixture of ortho-xylene and naphthalene is accomplished advantageously by a method which comprises packing in a reaction vessel, as a former-stage catalyst, a catalyst produced by supporting on an inactive carrier a catalytic substance composed of vanadium oxide and a specific anatase type titanium dioxide, Nb, P, Sb, and at least one component selected from the group consisting of K, Cs, Rb, and Tl as oxide and, as a latter-stage catalyst, a catalyst similar to the former-stage catalyst excepting the amount of the at least one component selected from among K, Cs, Rb, and Tl is in the range between 17 and 63% by weight as an oxide based on the amount of the same component used in the former-stage catalyst, both in specified bed heights feeding to this reaction vessel the mixture of ortho-xylene and naphthalene and a molecular oxygen-containing gas at a temperature in the range between 300.degree. and 450 .degree. C.

REFERENCES:
patent: 4472587 (1984-09-01), Benedetti et al.
patent: 4855458 (1989-08-01), Fuhrmann et al.
patent: 4879387 (1989-11-01), Hara

Affiliated with

Also associated with

Rating

Method for production of phthalic anhydride by vapor-phase oxida does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method for production of phthalic anhydride by vapor-phase oxida, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for production of phthalic anhydride by vapor-phase oxida will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1761770