“…Candidate auxiliary manipulated variables, that can be manipulated to reduce the reactor temperature, are catalyst feed rate, inert saturated organic feed rate, and ethylene partial-pressure controller setpoint. All these variables can stabilize the reactor temperature controller in the desired setpoint by reducing the rate of heat generation or increasing the heat transfer capacity (Salau, 2004). However, all of these variables reduce the production rate and other problems may arise with their use, some of them are shown in Table 1.…”