Patent ID: 7169293

Claim:
A process of catalytically reacting a feed by contacting it with catalyst particles at a controlled space velocity, said process comprising: delivering catalyst particles to a reactor section at a rate sufficient to provide a catalyst flux of between about 15 and about 1100 kg/m 2 s and a catalyst density in the reactor section between 48 and 320 kg/in 3 upon fluidization; distributing a reactant stream to said reactor section at a rate sufficient to provide a superficial velocity of between about 1 m/s and about 9 m/s, that will fluidize the catalyst particles and contact the reactant stream with catalyst particles, contacting said catalyst particles with said reactant stream; catalyzing the conversion of the reactant stream to a product stream; withdrawing catalyst particles and product fluid, including said product stream, from the reactor; separating said catalyst particles from said product fluid; recycling said catalyst particles which have not been regenerated as recycled catalyst particles to said reactor section; and mixing said recycled catalyst particles with regenerated catalyst particles before said regenerated catalyst particles contact said reactant stream.