Three phases in the development of computer simulation of chemical engineering systems

Three phases in the development of computer simulation of chemical engineering systems are considered. In the first phase, the mass and heat balances are calculated using detailed mathematical models of apparatuses. In the second phase, the chemical engineering system is optimized in a (strictly) deterministic formutation. In the third phase, the optimal parameters of the chemical engineering system are chosen provided that the system is serviceable throughout the possible range of internal and external factors. The method used in the third phase is the flexibility analysis of chemical engineering systems.