Abstract
Problems met in countercurrent separation units have been solved by means of a proper combination of two different models, referred to as sure and fast, to describe the whole set of theoretical stages. The “sure” model is employed for trays showing particular features, or disturbances, i.e. feed trays, partial condensers, reboilers, side cuts, intercoolers, etc. as well as for trays adjacent to the previous ones. This model is written in terms of single theoretical tray equations. The “fast” model is applied to multitray sections, provided that no “disturbance” exists, with an assumption that molar flowrates and temperatures vary according to prefixed laws. The adoption of effective K-values allows one to use formally the same operating equations for the multitray sections as for single theroretical trays. A Newton—Raphson procedure, combined with a B. P. method, is employed to converge the set of equations describing the problem.
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