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Author Narataruksa, Phavanee ♦ Bischert, Alexander ♦ Suphanit, Bunyaphat
Source J-STAGE
Content type Text
Publisher The Society of Chemical Engineers, Japan
Language English
Subject Keyword Fully thermally-coupled distillation column ♦ Dividing-wall column ♦ Column exergy loss
Abstract The dividing-wall column, a compact structure of the fully thermally-coupled distillation or the Petlyuk column, has been known for around half a decade. Typically, it can claim up to 30% savings in terms of both capital and energy costs when compared to the other conventional column arrangements. The dividing wall column is thermodynamically equivalent to the Petlyuk column on the condition that no heat transfer is allowed across the dividing wall. However, better energy efficiency of the column may be obtained if heat transfer occurs within a certain part of the wall. The effects of heat transfer across the dividing wall can be analyzed by using the Column Grand Composite Curve (CGCC) [Lestak, et al., 1994]. The heat transfer potential across the wall can be observed by looking at the CGCC of both column sections alongside the dividing wall. However, the possibility of whether heat should be added or rejected at any stage is not clearly known ahead of the CGCC. Consequently, in this work, the exergy analysis is applied to the dividing wall column in order to determine whether heat should be added or rejected at any particular stage. The heat load targets at any stage, plotted as a T-H profile similar to the CGCC, can then be determined using the Method of Pinto (1998). This method was reported to successfully apply to the column with multiple feeds and products. After having identified the locations and quantities of the feasible heat transfer across the dividing wall, the benefits are discussed via a case study.
Learning Resource Type Proceeding ♦ Article
Publisher Date 2004-01-01
Organization The Society of Chemical Engineers, Japan
Page Count 1
Starting Page 201
Ending Page 201


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