Mathematical Formulation of Integrated Oil refinery and an Petrochmical Ethylene Plant

It is about optimal integration between oil refinery and an ethylene production plant. Both plants are connected using intermediate materials. The integration should prove beneficial in terms of quality and profit increase for both production systems. Using 3 mathematical models by formulate and implement for each plant individually as well as for the integrated system as MINLP models aiming to optimize all three systems using GAMS program.