Minimum energy diagrams for multieffect distillation arrangements

Abstract

in Wiley InterScience (www.interscience.wiley.com). The minimum energy requirements of six different heat-integrated multieffect and three nonintegrated distillation arrangements for separating a ternary mixture have been considered. The focus is on a heat-integrated complex distillation configuration, called a multieffect prefractionator arrangement. The comparison of the different arrangements is based on the minimum vapor flow rates at infinite number of stages, which are easily visualized and compared in a V min diagram. This tool can be used as a basis for screening and the best arrangement(s) can be studied further using more rigorous simulation methods.

Energy Recovery in a Naphtha Splitter Process through Debottlenecking of Retrofitted Thermally Coupled and Double‐Effect Distillation Sequences

“…However, the DES gives the highest energy savings under an infinite number of trays. This preliminary comparison with the results from Emtir or Engelien highlighted their feasibility 15. 18 In addition, the information shown in the V min diagram was also used to find out the column sections that receive excess vapor in the DES arrangement.…”

“…Engelien and Skogestad15 developed an application of the minimum vapor flow ( V min ) diagram, considering the sharp separation of a ternary mixture. After defining the feed composition and the relative volatility of the components being separated, the diagram can be drawn by simply plotting several remarkable points.…”

“…In this case, the lower section in the main column received excessive vapor. Therefore, the information is necessary to consider using the side reboiler to balance the main column 15…”

Vapor recompression for efficient distillation. 1. A new synthesis perspective on standard configurations

“…In an attempt to mitigate this, a large number of increasingly complex modifications to, and departures from, conventional distillation have been devised over the last few decades. These include: Complex distillation arrangements/column coupling (e.g., Petlyuk, multieffect, and distributed‐feed columns); Diabatic columns (in which heat is added or removed on several or all stages, allowing the column to operate more reversibly); Heat‐pumping techniques (e.g., vapor recompression (VRC) and absorption heat pumps); Heat‐integrated distillation columns (in which the rectifying section is compressed and transfers heat to the stripping section, using a combination of the first three modifications). …”

Heat integration of a tetrahydrofuran recovery system to save energy

“…discussed some control issues of multi‐effect distillation. Engelien and Skogestad proposed V min diagram to analyze multi‐effect distillation of a commercial light hydrocarbon separation process. Lurgi proposed a three‐column methanol distillation scheme with double‐effect distillation, which was widely used in methanol refinery plant and reduced the energy consumption.…”