Answer Question No. 6 or 7 6. The catalytic hydro-desulfurization of dibenzothiophene (DBT) of diesel is as follows: 2 H O "Direct" HS dibenzothiophene biphenyl Correlate the conversion of DBT with respect to axial length of a trickle bed reactor when a) the reaction is of pseudo-first order with respect to hydrogen concentration due to high concentrationof DBT (1000ppm) in feed diesel, if the liquid is saturated with hydrogen; b) the reaction is of pseudo-first order with respect to DBT concentration due to low concentration of DBT (100ppm). Assume dispersion to be negligible. [15] 7. a)Develop the design equation for the fluidized bed reactor to correlate conversion with the length of the reactor [5] undergoing first order reaction.