Reducing energy consumption and CO2 emissions in extractive distillation: Part II. Dynamic behavior

Abstract

This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues.Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. b s t r a c tThe structure of thermally coupled distillation systems offers several control challenges arising from the transfer of vapor (or liquid) streams between columns. In particular, the presence of recycle streams for coupled schemes has led to the notion that control problems might be expected during the operation of these systems, in contrast to the rather well-known behavior of conventional distillation sequences.In this work, we analyze the control properties of thermally coupled extractive distillation schemes studied previously (Gutiérrez-Guerra, R., Segovia-Hernández, J.G. and a closed-loop analysis. The results showed that the energy savings predicted in the complex extractive distillation sequence can be achieved along with good dynamic behavior and reductions in greenhouse gas emissions.

Process Intensification ☆

“…In this case a sufficiently complete range of frequencies was covered. Similar studies have been reported by Jantes-Jaramillo et al [23], Gómez-Castro et al [18,24], and Ibarra-Sánchez and Segovia-Hernández [25] among others, for the control analysis of complex distillation systems. Other techniques available for the dynamic analysis of distillation systems are the relative gain array (RGA) analysis and the Niederlinski Index (NI) analysis, which allows to determinate the best pairing alternatives between control loops [26].…”

System Behavior and Predictive Controller Performance Near the Azeotropic Region

“…The overall behavior of the plant has also been utilized instead of a quantitative model to design a controller [26]. In short, a variety of solutions have been investigated and applied to counter the challenges posed by high-purity distillation columns [41][42][43][44][45][46][47].…”

Optimal retrofit design of extractive distillation to energy efficient thermally coupled distillation scheme

“…Azeotropic and close boiling components are commonly encountered in fine‐chemical and specialty industries. The separation of these mixtures is a challenging task in many chemical processes, which is impossible using a single conventional distillation column, and many nonconventional distillation techniques have been proposed to solve this problem . The most common alternatives involve changing the operating pressure or adding a separation solvent.…”