Distillation with secondary reflux and vaporization: A comparative evaluation
About: This article is published in Aiche Journal.The article was published on 1977-09-01. It has received 188 citations till now. The article focuses on the topics: Distillation & Vaporization.
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TL;DR: Finite-time thermodynamics is to place the system of interest in contact with a time-varying environment which will coax the system along the desired path, much like guiding a horse along by waving a carrot in front of it.
Abstract: The cornerstone of finite-time thermodynamics is all about the price of haste and how to minimize it. Reversible processes may be ultimately efficient, but they are unrealistically slow. In all situations-chemical, mechanical, economical-we pay extra to get the job done quickly. Finite-time thermodynamics can be used to develop methods to limit that extra expenditure, be it in energy, entropy production, money, or something entirely different. Finite-time thermodynamics also includes methods to calculate the optimal path or mode of operation to achieve this minimal expenditure. The concept is to place the system of interest in contact with a time-varying environment which will coax the system along the desired path, much like guiding a horse along by waving a carrot in front of it.
375 citations
TL;DR: The heat-integrated distillation column (HIDiC) as discussed by the authors is a special column that involves internal heat integration between the whole rectifying and the whole stripping sections.
Abstract: The heat-integrated distillation column to be addressed in this paper is a special distillation column that involves internal heat integration between the whole rectifying and the whole stripping sections. An overview of the research on this process is presented in this work. It covers from the thermodynamic development and evaluations to the practical design and operation investigations for the process. Comparative studies against conventional distillation columns are introduced and the results obtained show distinctively the substantial advantages in energy efficiency of the process over its conventional counterparts. Some relevant issues of process design and operation are to be stressed and the results of the first of its kind bench-scale plant experimentation are given in great detail. The application of internal heat integration principle to other distillation-related processes is also discussed in depth. These include heat integration within batch distillation columns, pressure-swing distillation columns that are used for the separation of pressure-sensitive binary azeotropes, and different distillation columns that have no connections at all. The prospects of the HIDiC and our future research work are then highlighted.
255 citations
TL;DR: In this article, the feasibility of heat integration in the reactive distillation schemes and in the two distillation columns having no direct connections is investigated, and the following areas are identified for heat integrated distillation column: rigorous dynamic modeling, optimal design, multiple steady state analysis, system identification, synthesis and implementation of high-quality nonlinear control, and importantly experimental evaluation.
237 citations
Cites background or methods from "Distillation with secondary reflux ..."
...Since 1977, Mah and his team members [16,17] evaluated the heat integrated distillation column operation under the name of secondary reflux and vaporization (SRV), where only part of the rectifying and stripping sections was integrated for heat transfer....
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...At first, part of the rectifying and stripping sections was integrated under the name of SRV scheme [16] and latter the column design has been modified to the heat integration between whole rectifying and stripping sections [19]....
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TL;DR: In this paper, the authors proposed a novel selection scheme of energy efficient distillation technologies, with a special focus on heat pumps, which considers as the main selection criteria the type of separation tasks, product flow and specifications, operating pressure, difference in boiling points, reboiler duty and its temperature level.
217 citations
TL;DR: In this article, an internally heat-integrated distillation column (HIDiC) for the separation of multicomponent mixtures was studied, and the design and operating variables were defined for this purpose, and were systematically varied to carry out a sensitivity analysis.
134 citations