Dynamic control analysis of eco-efficient double side-stream ternary extractive distillation process

The novel contribution of this paper is to implement the dynamic control investigation for the energy-saving double side-stream ternary extractive distillation configuration with constructing the practical and workable plumbing arrangement taking the representative example of separating a ternary benzene/isopropanol/water mixture. The new proposed control scheme achieves the stable regulatory control at rejecting the large disturbances of throughput and feed composition, wherein the particularly key control loops are controlling the product isopropanol composition by adjusting the extractant flow rate into extractive column C-2 with simultaneously regulating the reflux ratio in extractive column C-1 to abate the solvent dilution effect through composition cascade temperature control loops. (C) 2021 Elsevier Ltd. All rights reserved.

Automated summary

The novel contribution of this paper is the implementation of dynamic control investigation for the energy-saving double side-stream ternary extractive distillation configuration, with taking the representative example of separating a ternary benzene/isopropanol/water mixture by constructing practical and workable plumbing arrangement. The new proposed control scheme achieves stable regulatory control, particularly key control loops involve adjusting extractant flow rate in extractive column C-2 to control product isopropanol composition and regulating reflux ratio in extractive column C-1 to mitigate solvent dilution effect through composition cascade temperature control loops.