Fluidised Bed of Catalyst

The process is sometimes operated with fluidised catalyst bed to achieve isothermal conditions. However, more energy is required for increased gas flow velocity and loss due to attrition are also more. The crumbled catalyst particles can get blown off and deposit as a fine powder on heat transfer surfaces of the downstream equipments. Cyclone separator is installed to remove the catalyst particles fi om gas stream 

Attrition loss Catalyst particles (peUets/spheres) shall be hard enough to withstand the loss during transport, loading in converter, screening during aimual shutdowns and reloading in the converter. They shall not erode due to flow of gases 

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