Global Optimisation of Chemical Process Flowsheets

Some chemical process design systems include a numerical optimisation capability and this is increasingly being demanded. The incorporation of interval based global optimisation in modular based systems which dominate the market is difficult because of the way modules are used as black boxes. In this paper a way of implementing global optimisation by recasting the models in a generic way is discussed. Two interval based algorithms are presented with results on two simple process optimisation problems giving an idea of the price that may need to be paid for the convenience of the modular systems. The two interval algorithms are based on reformulating the problem to be able to provide tighter estimates for the lower bounds on convex nonlinearities.

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