Energy efficient control of a BTX dividing-wall column

Dividing wall columns in chemical process industry: A review on current activities

“…Moreover, it was found that thermally coupled distillation systems (TCDS) are not only well controllable, but they sometimes exhibit dynamic responses that are easier to manage than in the case of conventional distillation sequences [21,24,25]. Recently, Kiss and Rewagad [26] performed a comparison of several conventional control structures based on PID control loops enhanced by using the liquid split as an additional manipulated variable, thus implicitly achieving minimal energy requirements. Their reported dynamic results show good DWC controllability, relatively short settling times and low overshooting.…”

Dividing wall column: Improving thermal efficiency, energy savings and economic performance

“…It is interesting to note that the use of a wall to divide a HIDiC column into two closed semi-cylinders is also reported by Seader [7]. Among these configurations, the DWC technology has emerged as an attractive proposition [8]. The dividing wall column is a modified form of the Petlyuk column [9].…”

Review of Retrofitting Distillation Columns Using Thermally Coupled Distillation Sequences and Dividing Wall Columns to Improve Energy Efficiency

“…A top dividing wall column (TDWC) or bottom dividing wall column (BDWC) can be implemented by moving the dividing wall to the top or bottom of the column, respectively. The DWC can effectively reduce the energy requirement by up to 30%, while also lowering the engineering and hardware costs compared to those of conventional direct and indirect distillation sequences (Triantafyllou and Smith, 1992;Hernández and Jiménez, 1999;Segovia-Hernández et al, 2007;Sotudeh and Shahraki, 2008;Tamayo-Galván et al, 2008;Errico et al, 2009;van Diggelen et al, 2010;Long et al, 2010;Kiss and Bildea, 2011;Kiss and Rewagad, 2011). This improved energy efficiency arises because DWCs can allow reversible splits with no part of the separation performed twice (Poth et al, 2004).…”

“…A dynamic simulation showed that the profile position-product composition cascade control can maintain the product purity at the desired values despite feed disturbances and internal disturbances. Kiss and Rewagad (2011) compared several conventional control structures based on proportionalintegral-derivative (PID) control loops enhanced using the liquid split as an additional manipulated variable, thereby implicitly achieving minimal energy requirements. They reported dynamic results showing good DWC controllability, relatively short settling times, and low overshoot.…”