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Separation Process Engineering: Includes Mass Transfer Analysis, Third Edition by Phillip C. Wankat

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18.6.6 Detailed Simulators

Simultaneous solution of the combined mass and energy balances, the pressure drop equation [see Eq. (18-90)], and the equilibrium expressions is a formidable task, particularly for multicomponent, nonlinear systems. Until the 1990s solution of this set of differential, algebraic equations (DAE) was typically a task done by Ph.D. students for their thesis or by a few industrial experts who devoted their careers to simulation of sorption processes. This situation changed with the development of fairly general solvers for DAEs such as SPEEDUP, gPROMS, and Aspen Custom Modeler, and later the development of simulators such as ADSIM and Aspen Chromatography designed specifically for adsorption, chromatography and ion exchange. ...

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