C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/365, 252/95
C07C 51/265 (2006.01) B01J 23/22 (2006.01) C07C 51/21 (2006.01) C07C 51/31 (2006.01) C07C 63/16 (2006.01) B01J 21/06 (2006.01)
Patent
CA 1311740
ABSTRACT OF THE DISCLOSURE A method for the manufacture of phthalic anhydride by the catalytic oxidation of naphthlene and/ or ortho-xylene which comprises contacting a mixed gas containing naphthalene and/or ortho-xylene and a molecular oxygen-containing gas with a catalyst bed comprising a first catalyst packed on the upstream side of the flow of mixed gas and a second catalyst packed on the downstream side of the flow, wherein the first catalyst has carried on a nonporous inactive carrier a catalytically active component composed of 90 to 67% by weight of titanium dioxide, 8 to 30% by weight of vanadium pentoxide, 2 to 5% by weight of a cesium compound and 0.11 to 0.2 of cesium compound/vanadium pentoxide (molar ratio) (calculated as Cs2SO4), and the second catalyst has carried on the nonporous inactive carrier a catalytically active component composed of 94 to 67% by weight of titanium dioxide, 5 to 30% by weight of vanadium pentoxide and not more than 0.1% by weight of an alkali metal compound (calculated as sulfate), wherein specific surface are of catalytically active component of first catalyst is at least 20 m2/g.
563482
Nippon Steel Chemical Co. Ltd.
Sim & Mcburney
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