Patent ID: 6080882
Filing Date: 2000-06-27
Classification: B01J,C07C,Y02P

Abstract:
A process for producing acrylonitrile or methacrylonitrile from propane or isobutane by ammoxidation at a temperature in the range of from 380 to 500.degree. C. (ammoxidation reaction temperature) in a fluidized-bed reactor containing a catalyst composition comprising a carrier having supported thereon an oxide catalyst, said oxide catalyst comprising a compound oxide of molybdenum, vanadium, niobium and at least one element selected from the group consisting of tellurium and antimony,said process comprising:(1) providing a fluidized-bed reactor containing said catalyst composition preheated to a temperature of not lower than 300.degree. C. and lower than said ammoxidation reaction temperature;(2) elevating the temperature of said preheated catalyst composition in said fluidized-bed reactor, while supplying into said fluidized-bed reactor a molecular oxygen-containing gas together with a combustible gas capable of combustion by reaction with said molecular oxygen in the presence of said catalyst composition, until the temperature of the catalyst composition reaches said ammoxidation reaction temperature; and(3) changing the supply of the combustible gas and the molecular oxygen-containing gas into said fluidized-bed reactor to a feeding of propane or isobutane, ammonia and molecular oxygen into said fluidized-bed reactor when the temperature of the catalyst composition reaches said ammoxidation reaction temperature, to thereby effect an ammoxidation reaction of said propane or isobutane, thus producing acrylonitrile or methacrylonitrile.