C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/510.1, 260/3
C07C 51/265 (2006.01) B01J 23/00 (2006.01) B01J 23/20 (2006.01) C07C 63/313 (2006.01) C07D 493/04 (2006.01) B01J 35/02 (2006.01) B01J 37/02 (2006.01)
Patent
CA 1261860
67566-929 Abstract of the Disclosure Pyromellitic acid or its anhydride is prepared by catalytic vapour phase oxidation of a tetra-C1-C4-alkylbenzene in the presence of a catalyst supported on an inert carrier, said catalyst comprising catalytically active material composed of 1 to 20 parts by weight of V2O5, 99 to 80 parts by weight of TiO2 and/or SnO2 and/or ZrO2, and per one hundred parts by weight of V2O5, TiO2 and/or SnO2 and/or ZrO2, 0.02 to 10 parts by weight, calculated as P2O5, of a phosphorus compound, 0.01 to 5 parts by weight, calculated as Nb2O5, of a niobium compound, 0 to 1.2 parts by weight, calculated as oxide, of at least one metal selected from the group consisting of potassium, cesium, rubidium and thallium, and 0 to 10 parts by welght, calculated as Sb2O3, of an antimony compound, and an inert carrier supporting said catalytically active material thereon.
481767
Akazawa Yoji
Kurimoto Ikuo
Nakanishi Yoshiyuki
Takahashi Youjirou
Uchida Shinichi
Nippon Shokubai Kagaku Kogyo Co. Ltd.
Smart & Biggar
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