Distillation pinch points and more

Lucia, Ángelo; Amale, Amit; Taylor, Ross

doi:10.1016/j.compchemeng.2007.06.019

Cited by 72 publications

(97 citation statements)

References 28 publications

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“…In contrast to this approach, the shortest stripping line method (SSLM) [96,97] and related approaches [46,98] try to overcome these limitations by a unidirectional calculation of the concentration profile. The SSLM relies on the observation that for a feasible separation the column with the (geometric) shortest stripping profile in the concentration space operates at MED.…”

Section: Shortcut Methods Relying On Concentration Profile Calculationsmentioning

confidence: 98%

Conceptual Design of Azeotropic Distillation Processes

2014

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Section: Shortcut Methods Relying On Concentration Profile Calculationsmentioning

confidence: 98%

Conceptual Design of Azeotropic Distillation Processes

2014

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“…Our computational experience with many types of distillations shows that this is in fact the case and that the inner problem always has a unique minimum. For the details of the shortest stripping line distance approach, including the integer formulation for non-pinched minimum energy designs, we refer the reader to the article by Lucia et al 6 …”

Section: The Inner Problemmentioning

confidence: 99%

“…More recently, Lucia et al 6 have developed a novel and comprehensive approach to minimum energy requirements in distillations as well as multiunit processes based on the concept of shortest stripping line distance. This work clearly shows that minimum energy requirements for all types of processes, distillations, hybrid separations like extraction/distillation, and reaction, separation, recycle processes, can be determined in a straightforward geometric and intuitive manner by finding the shortest stripping line distance for the problem at hand.…”

Section: Introductionmentioning

confidence: 99%

“…This is followed by a description of a two-level algorithm for design and optimization based on processing target. The description of the inner loop, which is the shortest stripping line approach of Lucia et al, 6 includes for the first time all of the equations and derivative expressions necessary to determine minimum boil-up ratios for fixed values of bottoms composition. Next, the details of the outer loop are described.…”

Section: Introductionmentioning

confidence: 99%

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A two‐level distillation design method

Amale

Lucia

2008

AIChE Journal

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in Wiley InterScience (www.interscience.wiley.com).Recently, Lucia et al. have used a distillation line method to develop the concept of shortest stripping line distance approach to minimum energy designs of distillation columns and multiunit processes. It is well known that distillation line methods can be very sensitive to specified product compositions. A two-level distillation design procedure is proposed for finding portfolios of minimum energy designs when specifications are given in terms of key component recoveries. Thus, product compositions are not specified but calculated. It is shown that the proposed two-level design procedure is flexible and can find minimum energy designs for both zeotropic and azeotropic distillations. It is also shown that the two-level design method encompasses Underwood's solution but can find minimum energy designs when Underwood's method fails. Numerical results for several distillation examples involving ternary and quaternary mixtures are presented to support these claims, and geometric illustrations are used to elucidate key points.

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“…Despite the fact that the art of crude oil distillation has been practiced for many years [6,7], studies still continue to pursue improved design procedures with great effort and scrutinized research on optimization [8,9] which as a result has enormously increased our understanding of design for enhanced tower capacity and efficiency. To date, problems of determination of minimum number of stages, optimum operating conditions, and optimal locations of feed stage and side stream withdraws are all of basics that have already been thoroughly addressed [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Energy Saving in Crude Oil Atmospheric Distillation Columns by Modifying the Vapor Feed Inlet Tray

2011

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Optimization of a typical crude oil atmospheric distillation unit and reduction of energy conservation were carried out through modifying the implementation and change in the flash zone of the tower. A conventional procedure in such units involves the combination of liquid and vapor product of the prefractionation train surge drum upon introduction to the tower. However, it is theoretically illustrated and represented by simulation means that introducing the vapor feed into the upper stages of the distillation column separately can lead to an energy saving of 12.6 % in the condenser duty, an increased liquid-to-gas flow (L/G) at certain points of the column, and hence to a reduction in diameter and investment costs of new tower designs of approximately US$ 0.7 million a -1. The proposal can be put into practice without the need of additional equipments or additional cost of difficult rerouting the streams. An industrial case study of a steadystate crude oil distillation unit is given by simulation provision of AspenHysys™.

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Distillation pinch points and more

Cited by 72 publications

References 28 publications

Conceptual Design of Azeotropic Distillation Processes

Conceptual Design of Azeotropic Distillation Processes

A two‐level distillation design method

Energy Saving in Crude Oil Atmospheric Distillation Columns by Modifying the Vapor Feed Inlet Tray

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