A Study on Rigorous Dynamic Modeling and Simulation of Heat-Integrated Distillation Process

A rigorous dynamic modeling and dynamic simulation are performed to find the dynamic behaviour of a distillation column model including continuous/discrete variables, considering material balances, heat balances, nonlinear hydraulic equations and thermodynamic correlations in all equipments. Target process of this study is a distillation column aimed at separatingbenzene and toluene. Through dynamic modeling, 1,062 differential algebraic equations are acquired. Numerical solutions of dynamic behaviour such as pressure, temperature, fraction and molar flow rate in liquid and vapor phase. The feature in this study is to compare the energy consumption of a conventional distillation column with that of a heat integrated distillation column using dynamic simulation method. This study verifies energy efficiency through dynamic simulation in series of start-up of processes. There are some verifications of a heat integrated distilation column in view of steady state simulation but no verification in view of dynamic simulation. Also, this study considers operating procedures of the process in dynamic simulationthrough modeling of all equipments such as reboilers, refluxdrums, pumps, valves, digital PI controllers etc.