Process for producing phthalic anhydride and catalyst therefor

Details Process for producing phthalic anhydride and catalyst therefor Process for producing phthalic anhydride and catalyst therefor

1979-11-28

1981-08-18

Raymond, Richard

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

252435, C07D30789

Patent

active

042845718

ABSTRACT:
A process for producing phthalic anhydride, which comprises packing a catalyst into a multitube fixed bed converter, said catalyst comprising a catalytically active material composed of 1 to 20 parts by weight as V.sub.2 O.sub.5 of vanadium oxide, 99 to 80 parts by weight of anatase-type titanium oxide being porous and having a particle diameter substantially of 0.4 to 0.7 micron and a specific surface area of 10 to 60 m.sup.2 /g, and per 100 parts by weight of the sum of said two components, 0.01 to 1 part by weight as Nb.sub.2 O.sub.5 of niobium oxide, 0.05 to 1.2 parts by weight as an oxide of at least one ingredient selected from the group consisting of potassium, cesium, rubidium and thallium, and 0.2 to 1.2 parts by weight as P.sub.2 O.sub.5 of phosphorus, and a porous carrier having an alumina content of not more than 10% by weight, a silicon carbide content of at least 80% by weight and an apparent porosity of at least 10% supporting said catalytically active material thereon, wherein the total volume of pores having a diameter of 0.15 to 0.45 micron present in the layer of the catalytically active material on the carrier is at least 50% of that of pores having a diameter of not more than 10 microns present in said layer of the catalytically active material; and passing o-xylene or naphthalene and oxygen or a molecular oxygen-containing gas through the catalyst layer at a temperature of 300.degree. to 450.degree. C., thereby catalytically oxidizing the o-xylene or naphthalene; and a catalyst suitable for performing said process.

REFERENCES:
patent: 3296281 (1965-10-01), Hughes
patent: 3296846 (1965-12-01), Ono et al.
patent: 4046780 (1977-09-01), Nakanishi et al.
Zimmer, Chemical Engineering (Mar. 1975), pp. 82 & 83.
Hellmer et al., I. Chem. E. Symposium Series, vol. 50 (1976), pp. 4-16.

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