Patent ID: 6084119
Filing Date: 2000-07-04
Classification: B01J,C07C,Y02P

Abstract:
A process for producing acrylonitrile or methacrylonitrile which comprises carrying out a fluidized bed ammoxydation reaction of propylene, isobutene or tertiary butanol while adding an activator to the fluidized bed, wherein a molybdenum compound which is convertible to molybdenum oxide and not supported on a carrier is added as said activator to a fluidized bed reactor, and said fluidized bed ammoxydation reaction of propylene, isobutene or tertiary butanol is carried out in the presence of a catalyst comprising silica and an oxide catalyst represented by the formula:Mo.sub.y Bi.sub.p Fe.sub.q A.sub.a B.sub.b C.sub.c D.sub.d E.sub.e O.sub.f(wherein Mo is molybdenum, Bi is bismuth, Fe is iron, A is at least one element selected from the group consisting of nickel and cobalt, B is at least one alkali metal element, C is at least one element selected from the group consisting of magnesium, calcium, strontium, barium, zinc, manganese, lead and cadminum, D is at least one rare earth element, E is at least one element selected from the group consisting of chromium, indium and gallium, O is oxygen; y is a ratio of molybdenum atoms during the ammoxidation reaction and y=1.02x-1.12x wherein x=1.5p+q+a+c+1.5d+1.5e; and p, q, a, b, c, d, e and f are ratios of atoms of bismuth, iron, A, B, C, D, E and oxygen, respectively, but p=0.01-5, q=0.1-5, a=4-10, b=0.01-2, c=0-5, d=0-5, e=0-5, and f is the number of oxygen atoms necessary for satisfying the valence requirements of other elements present in the composition),the amount of silica being 30-70% by weight based on the total amount of said silica and said oxide catalyst,said oxide catalyst being supported on said silica,with the ratio of molybdenum atoms y in said oxide catalyst being maintained in the range of 1.02x to 1.12x.