In present analysis, a trickle bed reactor process is selected for control system analysis. This system is modelled as a third order plus delay time (TOPDT) model. Since, very few controller design methods are available for TOPDT model, this model is approximated to integrator plus date time (IPDT) model. Suitable controllers based on Ziegler and Nichols, Hay, Alfaro Rulz, Gorecki and Leonard tuning techniques are designed. Important steady state and transient time response characteristics are derived and compared for these models with designed PID controllers using various controller tuning methods in closed loop feedback system.