Retrofit of Distillation Columns Using Thermodynamic Analysis

Demi̇rel, Yaşar

doi:10.1080/01496390600600047

Cited by 42 publications

(23 citation statements)

References 15 publications

(40 reference statements)

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“…A methanol plant that utilizes two distillation columns to purify methanol in its separation section was retrofitted (Demirel, 2006). The suggested retrofits consisted of an additional side condenser at stage 4 and feed preheating for column 1, as well as two side reboilers at stages 87 and 92 for column 2.…”

Section: Single-column Casementioning

confidence: 99%

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

Long

Lee

2014

J. Chem. Eng. Japan / JCEJ

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Distillation is a common energy-intensive process. Accordingly, it is the rst process to be addressed to improve the energy e ciency over both the short-and long-term. Recent studies and industrial applications have proven that advanced process integration and process intensi cation techniques such as the use of a thermally coupled distillation sequence (TCDS) and a dividing wall column (DWC) require the lowest amount of energy for the separation of mixtures into pure product streams. This paper reviews some energy-e cient distillation technologies that can be used in a retro t design. The research on and implementation of retro ts using a TCDS and DWC are reviewed. This report proposes coupled schemes as alternatives to using a Petlyuk column that do not have the classical problem of controlling the vapor transfer from one column to another and have not previously been proposed for retro ts. These schemes are expected to make signi cant contributions to improving the energy e ciency and mitigating CO 2 emission in the retro tting of distillation systems. The authors evaluated a solution for retro tting azeotropic and extractive distillation systems. Various issues such as the constraints, techno-economic analysis, controllability, and operability are discussed brie y to provide more insight into the application of TCDS and DWC technologies in the retro t.

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Section: Single-column Casementioning

confidence: 99%

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

Long

Lee

2014

J. Chem. Eng. Japan / JCEJ

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“…Therefore, it can be used to identify and eliminate column bottlenecks [9][10][11]. Tray or packing rating for the entire column is necessary to activate the hydraulic analysis.…”

Section: Hydraulic Analysismentioning

confidence: 99%

“…One of the thermodynamic methodologies to assess the distillation column operation is the column targeting tool (CTT), which is based on the practical near-minimum thermodynamic condition (PNMTC) approximation representing a practical and close to reversible operation [7,8]. CTT exploits the capabilities for thermal and hydraulic analyses of distillation columns [4,7] to identify the targets for possible column retrofits for (1) feed stage location, (2) reflux ratio, (3) feed conditioning, and (4) side condensing and/or reboiling to reduce the cost of utilities and improve the overall energy efficiency [9][10][11]. The 'carbon tracking' options of the Aspen Plus can help quantify the reduction in CO 2 emission in a simulation environment [8].…”

Section: Introductionmentioning

confidence: 99%

Energy intensity and environmental impact metrics of the back-end separation of ethylene plant by thermodynamic analysis

Alhajji

Demi̇rel

2015

Int J Energy Environ Eng

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This study presents metrics of energy intensity and environmental impact of the back-end separation of ethylene plant consisting three interacting distillation columns by thermodynamic analysis. The objective is to explore the scope of reducing the energy for utilities and CO 2 emissions. Thermodynamic analysis is carried out using the column targeting tool (CTT) to address the sustainability metrics of 'Energy Intensity.' CTT is based on the 'Practical Near-Minimum Thermodynamic Condition' representing a close to practical reversible column operation. Environmental impact metrics are estimated from the carbon tracking options. The carbon tracking are estimated by the CO 2 emission data source of US-EPA-Rule-E9-5711 using natural gas as the primary fuel. The results show that the total reductions in exergy loss and the total hot and cold utility are around 44 and 10 %, respectively; the total reductions in carbon dioxide are around 14 %. These improvements lead to considerable reductions in the operating costs. Thermodynamic analysis helps estimating and improving the energy and environmental sustainability metrics and hence can lead to a more sustainable separation by distillation columns.

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“…However, the assumption of reversibility presents some limitations for the application of this methodology to multicomponent systems [27]. Several attempts had been made by various researchers to introduce diagrammatic methods that could aid to the design and retrofit of energy efficient distillation processes [25], [19], [28], [6], and [5]. Much consideration has not been given to multicomponent distillation systems.…”

Section: Introductionmentioning

confidence: 99%

Advanced exergy analysis of distillation tower and simulation and optimization by hysys

Darabi

Mohammadiun

2015

Int. J. Sci. World

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Exergy rate profiles, exergetic efficiency and irreversibility were used to examine the driving forces in multicomponent distillation system with the view to identifying feasible and efficient operating parameters. The mixture comprised of 5% propane, 15% iso butane, 25% n-butane, 20% iso pentane and 35% n-pentane. Operating variables were feed temperature (-30oC and -80oC), pressure (800KPa and 1200KPa), and reflux-ratio (2 and 6). Sensitivity analysis was carried out to examine the effect of varying operating parameters on the systems. Stage-by-stage system exergy analysis was estimated. Column profiles of a base case -30oC, -80oC, -30oC-reflus ratio 6,80oC -80oC reflux ratio 6 and base case reflux ratio 6 did not cross thus are thermodynamically feasible. Base case -30oC-reflux ratio 2, -80oC-reflux ratio 2, and base case-reflux ratio 2 were crossed and constricted and are infeasible. Base case results gave efficiency of 81.7% at depropanizer and 65.2% at debutanizer. Base cases sensitivity results with -30oC, -80oC and reflux ratio 6, efficiency range 57.40 -70% and 65.20% -54.90% for depropanizer and debutanizer respectively. Spitted cases gave 81.7% and 62.20% with more scatter profiles. Splitted feed base case -30oC design gave the lowest overall system exergy loss rate of 1.12E+6 and efficiency of 95.70%.

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Retrofit of Distillation Columns Using Thermodynamic Analysis

Cited by 42 publications

References 15 publications

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

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

Energy intensity and environmental impact metrics of the back-end separation of ethylene plant by thermodynamic analysis

Advanced exergy analysis of distillation tower and simulation and optimization by hysys

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