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Документ Understanding process intensification in cyclic distillation systems(2011) Maleta, Vladimir; Kiss, Anton; Taran, Vitaly; Maleta, BogdanThe most effective separation possible in distillation columns takes place in the hydrodynamic regime where there is perfect displacement of the liquid and vapor streams. This can be achieved in distillation equipment with separate phase movement (SPM). Such an innovative route for process intensification in distillation is called cyclic distillation. The required process conditions are the lack of liquid outflow from the tray during vapor admission and the lack of liquid mixing in adjacent trays upon outflow of liquid. Remarkably, the throughput of such a column that operates in a controlled cycle mode is two or more times higher than the throughput reachable with conventional operation, at equivalent separation performance. In this study, a theoretical stage model with perfect displacement is proposed and the theory of the process working lines is developed. An adequate mass transfer model is also described along with the mode of calculation of tray columns operating in the cyclic operation mode. Sensitivity analysis was used to determine the effect of the key model parameters. The theoretical developments were implemented at industrial scale and subsequent testing showed an increase in the separation efficiency of 2-3 times as compared to the standard process.Документ Hydrodynamics of liquid flow in the model of theoretical stage with perfect displacement(2011) Maleta, Vladimir; Taran, Vitaly; Maleta, BogdanPursuant to Lewis' work [1], the use of combinations of various hydrodynamic models of liquid and vapor phases enhances the efficiency of component separation on the tray. The greatest effect is achieved upon perfect displacement by liquid and vapor and sing-direction movement of liquid on adjacent contact degrees. In such conditions the efficiency of Murphy's tray may significantly exceed the local efficiency and reach 200-300% Cannon [2] suggested the way of phase interaction, for which during the passage of vapor through the column the liquid doesn’t overflow from tray to tray and upon liquid overflow it doesn't mix on adjacent trays (cyclic process). In a series of works [3, 4] it was shown that upon comparison of stationary and cyclic process both by the time of mass transfer on the tray and by the phase interaction nature the cyclic process is similar to the stationary process upon sing-direction movement of liquid on adjacent contact levels and perfect displacement by liquid and vapor. A mathematical model of the hydrodynamic processes occurring in a periodic cycled plate column is developed and experimentally confirmed.