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

Long, Nguyen Van Duc; Lee, Moonyong

doi:10.1002/aic.13906

Cited by 50 publications

(12 citation statements)

References 41 publications

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“…20 The main advantage of RSM is its ability to gain understanding of the main factors and interactions that affect the studied response, which is used for the generation of the reduced process model. Furthermore, the RSM can be used as an alternative optimization methodology to reach the pseudo‐optimal solutions with a high statistical confidence in its results 12. After determining the preliminary ranges of the variables through single‐factor testing, a central composite design was used to determine how the variables interact as well as to optimize the system in terms of the reboiler duty.…”

Section: Thermally Coupled Distillation Sequencementioning

confidence: 99%

“…These modifications often require significant plant downtime, which leads to a loss of production and an interruption of the product supply to the customers. On the other hand, DWC is not attractive if the plant lifetime is not long because of the lengthy payback period 12. Instead, TCDS and DES have attracted considerable attention in retrofitting projects due to the lower energy requirements compared to existing column sequences, as well as the small scale of the modification.…”

Section: Introductionmentioning

confidence: 99%

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Energy Recovery in a Naphtha Splitter Process through Debottlenecking of Retrofitted Thermally Coupled and Double‐Effect Distillation Sequences

2015

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A thermally coupled distillation sequence (TCDS) and a double‐effect sequence (DES) were proposed to retrofit an existing naphtha splitter process in the refinery plant for enhanced energy efficiency. This, however, can create a bottleneck in the columns. A side reboiler was proposed to debottleneck the retrofitted columns. The concept of minimum vapor flow rate was used as a preliminary calculation to determine the benefits of these proposed arrangements. A practical optimization using the response surface methodology was applied to the design of TCDS and DES. In addition, a column grand composite curve was used to highlight the thermodynamic feasibility of the implementation of a side reboiler into the retrofitted sequences. As a result, the DES was shown as the best alternative through combination of a side reboiler, and this achieved 32.7 % savings on operating costs with a maximum reuse of the existing equipment.

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Section: Thermally Coupled Distillation Sequencementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Energy Recovery in a Naphtha Splitter Process through Debottlenecking of Retrofitted Thermally Coupled and Double‐Effect Distillation Sequences

2015

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“…Distillation in the chemical industry has evolved in numerous ways by overcoming the inherent thermodynamic limitations of mixtures. However, complex distillation arrangements separating mixtures with various phase equilibrium characteristics or accompanying thermal integration require exquisite operation by augmenting design variables 1–4 . In the design of distillation processes, a volatility difference between the components is mandatory to induce separation to different extents through vapor–liquid(−liquid) equilibrium (VL(L)E) 5,6 .…”

Section: Introductionmentioning

confidence: 99%

Synthesis of heat‐integrated pressure‐swing azeotropic distillation using a graphical pinch analysis

et al. 2021

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A new graphical method for the fundamental design of pressure‐swing distillation (PSD) and valid heat integration of the designed process is demonstrated based on a pinch analysis. As the minimum pressure constraint, the pinch pressure is determined by this graphical method to secure the necessary temperature driving force and circumvent the distillation boundaries. For a feasibility evaluation of heat‐integrated PSD (HIPSD), the suggested approach requires visualization of the pinch temperature contours and the feasible composition region of an initial feed according to the pressure change and dynamic properties of ternary azeotropic systems. We thus carried out an in‐depth examination by conducting case studies to show the feasible integration into HIPSD. The new insight is that the HIPSD system can have different pinch pressures depending on the column sequence or the separation order of pure components. In addition, the analysis verifies that energy‐efficient HIPSD can be generated by considering pinch constraints.

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“…Luyben 32 provided a detailed introduction for creating a steady-state design and optimizing and assessing the controllability of a distillation process using Aspen Plus. Long and Lee 33 investigated the ED process with a retrofit design using HYSYS to achieve further energy saving and to improve the process capacity. Shirsat et al .…”

Section: Introductionmentioning

confidence: 99%

Phase Behavior and Thermodynamic Model Parameters in Simulations of Extractive Distillation for Azeotrope Separation

et al. 2017

Sci Rep

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Extractive distillation (ED) processes for separating ternary mixtures of benzene-cyclohexane-toluene with dimethyl formamide (DMF) and N-methyl-2-pyrrolidone (NMP) were studied using Aspen Plus and PRO/II simulators. The Aspen Plus built-in binary interaction parameters for the toluene-DMF, benzene-NMP and cyclohexane-NMP systems resulted in inaccurate phase behavior calculations. The vapor-liquid equilibrium (VLE) for the three binary systems was regressed to illustrate the importance of using accurate model parameters. The obtained binary interaction parameters described the phase behavior more accurately compared with the built-in binary interaction parameters in Aspen Plus. In this study, the effects of the regressed and built-in binary interaction parameters on the ED process design are presented. The total annual cost (TAC) was calculated to further illustrate the importance of the regressed binary interaction parameters. The results show that phase behavior and thermodynamic model parameters should receive more attention during the research and development of ED processes.

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

Cited by 50 publications

References 41 publications

Energy Recovery in a Naphtha Splitter Process through Debottlenecking of Retrofitted Thermally Coupled and Double‐Effect Distillation Sequences

Energy Recovery in a Naphtha Splitter Process through Debottlenecking of Retrofitted Thermally Coupled and Double‐Effect Distillation Sequences

Synthesis of heat‐integrated pressure‐swing azeotropic distillation using a graphical pinch analysis

Phase Behavior and Thermodynamic Model Parameters in Simulations of Extractive Distillation for Azeotrope Separation

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