A gas oil is cracked at 630C and 1 bar by passing vaporized feed through a packed
Question:
A gas oil is cracked at 630°C and 1 bar by passing vaporized feed through a packed bed of spheres of silica alumina catalyst with radius =0.088 cm. For a feed rate of 60 cm3 liquid/h, a 50 percent conversion is found. The following data are also known
Assume effective diffusivity in catalyst = 8 x 103 cm2/s average reactant concentration = 0.8 x10-5mol/cm3 liquid density =0.869 g/cm3 feed molecular weight = 225 g/mol bulk density of packed bed = 0.7 g cat./cm3
Solid density of catalyst = 0.95 g cat./cm3 cat
Assume a first-order reaction and treat data as being average data of a differential reactor.
a) Show that the average reaction rate is 3.9 × 10-5 mol/cm3 cat. s.
b) Determine from the data whether or not pore diffusion wasimportant.
c) Find the value of the effectiveness factor.
d) Determine the value of the rate coefficient.