Patent ID: 6545177
Filing Date: 2003-04-08
Classification: B01J,C07C

Abstract:
A process for preparing acrylic acid through oxidation of acrolein at vapor phase with molecular oxygen or a molecule oxygen-containing gas in the presence of a catalyst, using a complex oxide catalyst having the general formula (1)MoaVbWcCudAeBfCgDhEiOxâ€ƒâ€ƒ(1) wherein Mo is molybdenum; V is vanadium; W is tungsten; Cu is copper; A is at least an element selected from antimony, niobium and tin; B is at least an element selected from alkaline earth metals; C is at least an element selected from silicon, aluminum, titanium and zirconium; D is at least an element selected from phosphorus, tellurium, cerium, lead, arsenic and zinc; E is at least an element selected from Group IA and Group IIIb elements of the periodic table, boron, iron, bismuth, cobalt, nickel and manganese; O is oxygen; a, b, c, d, e, f, g, h, i and x denote the atomic ratios of Mo, V, W, Cu, A, B, C, D, E and O, respectively where aâˆ’12, 2&lE;b&lE;15, 0&lE;c&lE;10, 0&lE;d&lE;6, 0&lE;e&lE;6, 0wherein said complex oxide is prepared by using, as at least a part of the supply sources of components B and C, a B/C compound containing both of the components B and C.