A new method of locating all pinch points in nonideal distillation systems, and its application to pinch point loci and distillation boundaries

Felbab, N.; Hildebrandt, Diane; Glasser, David

doi:10.1016/j.compchemeng.2010.11.007

Cited by 8 publications

(25 citation statements)

References 25 publications

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“…Secondary pinch branches can be detected by means of bifurcation analysis embedded into the continuation. While the calculation of all pinch branches connected to the singular points is mostly sufficient, additional isolated pinch branches may occur that can only be detected by computationally more involved methods [48,49].…”

Section: Reversible Distillationmentioning

confidence: 99%

Conceptual Design of Azeotropic Distillation Processes

2014

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Section: Reversible Distillationmentioning

confidence: 99%

Conceptual Design of Azeotropic Distillation Processes

2014

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“…Other approaches for the calculation of pinch points that are not based on continuation or integration include a deflation method and a hybrid sequential niche algorithm, 55 as well as an optimization-based approach with a systematic refinement of the composition space. 56 However, these approaches are computationally much less efficient. Most importantly, all listed approaches have only been presented for homogeneous mixtures.…”

Section: Azeotrope and Pinch Point Calculationmentioning

confidence: 99%

“…In that case, all relevant pinch points are located inside the physical composition space, at least for the rectifying and stripping section. Therefore, inaccurate results of pinch-based shortcut methods for nonsharp splits, e.g., reported by Felbab et al 56 or Beneke et al, 55 are not the result of an insufficiency of the pinch-based shortcut method but rather of an inappropriate product specification.…”

Section: K-valuesmentioning

confidence: 99%

A Unifying Approach for the Calculation of Azeotropes and Pinch Points in Homogeneous and Heterogeneous Mixtures

Skiborowski

Bausa

Marquardt

2016

Ind. Eng. Chem. Res.

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This paper presents a unifying approach for a reliable calculation of all azeotropes and pinch points for homogeneous and heterogeneous non-reactive mixtures. The approach builds on a reformulation of the pinch-equation system and an efficient continuation algorithm including bifurcation analysis. The calculation of azeotropes is based on an analogy of univolatility curves and the pinch branches for pure component products. The resulting method can efficiently and reliably calculate all homogeneous and heterogeneous non-reactive azeotropes. The only exception would be the existence of isolated univolatility curves inside the composition space, which to the best knowledge of the authors has never been reported. Since the method can further determine the pinch branches and pinch points based on the knowledge of the azeotropes, it presents a self-contained method for calculation of the most important information on nonideal multicomponent mixtures to support process synthesis. The application of the method is illustrated by means of several complex mixtures.

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“…Park et al measured the vapor–liquid data of dimethyl carbonate and toluene, and the results indicated that they exist in pinch point when dimethyl carbonate content is 0.8–1 mole fraction. The separation of dimethyl carbonate–toluene mixtures becomes very important. − Since the use of traditional separation technology cannot achieve effective separation for the mixtures, special separation or purification technology is need. Distillation has the shortcoming of high energy consumption and complicated operation steps. − The membrane price was expensive and had a short replacement cycle − for membrane separation technology.…”

Section: Introductionmentioning

confidence: 99%

Ternary Liquid–Liquid Equilibrium of Toluene + Dimethyl Carbonate + ILs at 298.15 K and Atmospheric Pressure

Zhu

Geng

et al. 2019

J. Chem. Eng. Data

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The separation of toluene and dimethyl carbonate azeotropes is beneficial for resource recovery and environmental protection. Ionic liquids (ILs) are widely considered as a green solvent. The feasibility of separating the toluene and dimethyl carbonate mixtures with pinch point using 1-butyl-3-methylimidazolium hexafluorophosphate ([Bmim][PF6]), 1-hexyl-3-methylimidazolium hexafluorophosphate ([Hmim][PF6]), 1-butyl-3-methylimidazolium dicyanamide ([Bmim][DCA]), and 1-ethyl-3-methylimidazolium dicyanamide ([Emim][DCA]) as solvents are investigated in this work. The ternary liquid–liquid equilibrium data of toluene + dimethyl carbonate + ILs are determined at 298.15 K under 101.325 kPa. The distribution coefficient (β) and selectivity (S) are used to evaluate the extraction performance of ILs. The selectivity at the infinite-dilution activity coefficient (S dimethyl carbonate, toluene ∞) based on conductor like screening model (COSMO-SAC) is compared with the selectivity calculated from the experimental data. Interaction relationship among toluene, dimethyl carbonate, and ILs are studied based on σ-profiles and bond energy. The binary interaction parameters of the nonrandom two-liquid and universal quasichemical models are well-regressed from the experimental data.

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A new method of locating all pinch points in nonideal distillation systems, and its application to pinch point loci and distillation boundaries

Cited by 8 publications

References 25 publications

Conceptual Design of Azeotropic Distillation Processes

Conceptual Design of Azeotropic Distillation Processes

A Unifying Approach for the Calculation of Azeotropes and Pinch Points in Homogeneous and Heterogeneous Mixtures

Ternary Liquid–Liquid Equilibrium of Toluene + Dimethyl Carbonate + ILs at 298.15 K and Atmospheric Pressure

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