Patent ID: 7534341
Filing Date: 2009-05-19
Classification: B01J,C08F

Abstract:
1. A method comprising metering discontinuously at least one solid, particulate catalyst and/or process auxiliary into a reactor ( 5 ) containing a fluidized bed ( 11 ) of particles in an at least partly gaseous medium at prescribed time intervals into the fluidized bed ( 11 ) at least one metering point ( 10 ), wherein a first fluid stream is in each case introduced into the reactor ( 5 ) so that a region having a reduced particle density is formed in the fluidized bed ( 11 ) around the at least one metering point ( 10 ) and the at least one solid, particulate catalyst and/or process auxiliary is subsequently metered into the region having a reduced particle density, and wherein the first fluid stream is introduced discontinuously for a period of from 0.5 to 60 s and the catalyst is metered in after a delay of from 0.5 to 3 s after commencement of the introduction of the first fluid stream.