Question

With neat and labeled diagram explain fixed bed catalytic cracking.

Answer 1

Fixed Bed catalytic cracking: Heavy oil is vapourised by heating in an electrical heater. The vapors are passed over a series of trays containing catalysts such as crystalline aluminium silicate,silicate benzoate, bauxite and zeolites. The reaction chamber is maintained at 425^o C to 540⁰C and under pressure of 1.5kg/cm².The cracked gases are taken out from the top of the reaction chamber and allowed to pass into fractionating tower.