Abstract
The paper demonstrates that a rigorous dynamic simulation for distillation columns, including varying pressure and vapor holdup is feasible using a UV-flash approach. A strategy is presented for calculating this flash efficiently when used in dynamic simulation. The paper also considers use of local thermodynamic models combined with look-up tables, where all variables are continuous in time. The results are illustrated on a propane-butane fractionator where the vapor holdup is considerable and should not be neglected.
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