Cracking is a process in which large hydrocarbon molecules are broken up cracked into smaller, more valuable hydrocarbon molecules. The cracking of petroleum hydrocarbons was originally done by thermal cracking. Now, catalytic cracking offers a greater economic value than the gases produced by thermal cracking. Assume in a catalytic cracking regenerator, catalytic particles at 600°C are injected into air at 700°C in a fluidized bed. The specific heat of the particle is 1050 J/kg.°C, the density is 950 kg/m3, and the thermal conductivity is 5 W/m.°C. Assume the heat-transfer coefficient of air is 2700 W/m2.°C. Neglecting the chemical reaction, how long will it take for a 50-μm particle to be heated to 695°C? State the Figure or Equation used in your c

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