Minimum vapor flows in a distillation column with a sidestream stripper

Abstract

A shortcut procedure to evaluate the minimum vapor flows in distillation columns with a sidestream stripping section is presented. The method Is simple and highly accurate for relatively ideal mixtures. The case of a ternary mixture is discussed, but the algorithm readily extends to mixtures with any number of components. Also, the approach can be generalized to other types of complex columns as well.

Graphical design and analysis of thermally coupled sidestream columns using column profile maps and temperature collocation

“…16 Numerous techniques have been proposed to design thermally coupled side rectifiers and strippers. Several of these methods deploy the Underwood equations, [17][18][19] but this method is reliable only for nearly ideal and zeotropic systems and also assumes sharp product specifications. The vapor rate and the minimum reflux ratio, both of which are imperative for the column design and cost, will therefore be idealized using the Underwood methods.…”

Optimum design of Petlyuk and divided-wall distillation systems using a shortcut model

“…The minimum reflux ratio could be calculated from Underwood's method; however, the compositions for V I and L I are unknown. Glinos and Malone (1985) reported a method for the estimation of minimum reflux for distillation systems with side rectifiers. The system of section II is similar to their arrangement.…”

“…Thermally coupled structures are developed by substituting vapor-liquid interconnections between two columns for a condenser or a reboiler of one of the columns. The three types of thermally coupled arrangements more widely studied are the systems with side columns (the sequence with a side rectifier and the sequence with a side stripper) (Finn, 1993;Glinos and Malone, 1985;Hernández and Jiménez, 1996) and the fully thermally coupled system, or Petlyuk column (Petlyuk et al, 1965;Triantafyllou and Smith, 1992;Hernández and Jiménez, 1999). Other coupled alternatives have been recently suggested to simplify the structure of these three thermally coupled systems by reducing vapor-liquid interconnections (Agrawal and Fidkowski, 1999;Agrawal, 2000).…”

A New Configuration for a Fully Thermally Coupled Distillation Column with a Postfractionator and Separated Main Columns

“…Counting the tray numbers gives the total number of trays, feed and side product locations and interlinking stages. Because the trays numbers calculated so far were for the minimum tray column, the tray structure was scaled up by a factor of two for a practical column using a design guideline [14].…”