Insight into pressure-swing distillation from azeotropic phenomenon to dynamic control

Liang, Shisheng; Cao, Yujuan; Liu, Xingzhen; Li, Xin; Ya, Zhao; Wang, Yongkun; Wang, Yinglong

doi:10.1016/j.cherd.2016.10.040

Cited by 253 publications

(75 citation statements)

References 106 publications

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“…The pressure‐swing distillation (PSD) is one of the commonly used methods to separate pressure‐sensitive mixtures containing one or more azeotropes. It does not cause the same potential problem of the added component compared to extractive distillation . Up to now, a considerable amount of literature has investigated the double‐column PSD process for separating the binary azeotropic system in terms of steady simulation and dynamic control .…”

Section: Introductionmentioning

confidence: 99%

“…It does not cause the same potential problem of the added component compared to extractive distillation. 1,2 Up to now, a considerable amount of literature has investigated the double-column PSD process for separating the binary azeotropic system in terms of steady simulation and dynamic control. [3][4][5][6][7][8][9][10] However, only a limited number of studies on the triple-column PSD process for the separation of ternary multi-azeotropic mixtures have been reported and gained extensive attention.…”

Section: Introductionmentioning

confidence: 99%

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Separation of a ternary mixture with multiple azeotropes via pressure‐swing distillation

Wang

Guang

Cui

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND The ternary mixture of tetrahydrofuran (THF), ethanol and water contains multiple azeotropes with the sensitivity to pressure variation. The pressure‐swing distillation (PSD) is a promising method to achieve the system's separation objective since it avoids many potential problems caused by adding a third component. RESULT A variety of separation sequences were synthesized on the ternary diagram, including the sequences of WLEMTH, WLTH EM, THEMWL, THWLEM, EMTHWL and EMWLTH. The optimal design parameters of these sequences were obtained based on the minimum total annual cost (TAC) by using the sequential iterative global optimization algorithm. Furthermore, six kinds of heat integration that improve energy efficiency were implemented for the optimal alternative of EMTHWL. CONCLUSION The results show that the EMTHWL configuration has the lowest TAC, saving 37.84% of the economic cost compared to the THEMWL which has the highest TAC. The partial heat integration among three columns can achieve almost the same reductions in energy requirements and carbon dioxide emissions (44.9%) as the full heat integration among three columns (45.4%). In addition, it is predictable that the partially heat‐integrated alternative compared to other fully heat‐integrated schemes has less undesirable side effects in the aspect of dynamic control. © 2019 Society of Chemical Industry

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Separation of a ternary mixture with multiple azeotropes via pressure‐swing distillation

Wang

Guang

Cui

et al. 2019

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

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“…However, it is hard and complex to separate the specified mixture due to the presence of three binary azeotropes at atmospheric pressure. Many special techniques are available for the separation of azeotropes, such as azeotropic distillation, extractive distillation, pressure‐swing distillation, hybrid distillation‐pervaporation, salt distillation and several other separation techniques . Recently, a few pressure‐swing distillation studies have been reported for separating multi‐azeotropic systems, yet there have been no relevant studies on extractive distillation which is also a promising alternative method.…”

Section: Introductionmentioning

confidence: 99%

Comparison of extractive distillation separation sequences for acetonitrile/methanol/benzene multi‐azeotropic mixtures

Wang

Guang

et al. 2018

J of Chemical Tech & Biotech

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Background The extractive distillation‐based separation of a multi‐azeotropic mixture has several optional solvents and schemes. The screen of a suitable solvent was performed and diverse extractive distillation sequences were compared for separating the specified mixture of acetonitrile/methanol/benzene. Result As a solvent breaking all binary azeotropes, chlorobenzene was selected over aniline on the basis vapor–liquid equilibrium diagrams and infinite dilution factors. Four separation sequences were optimized by the sequential iterative procedure on the basis of minimal total annual cost (TAC), and CO2 emissions were calculated. Among four sequences, sequence III, composed of two extractive distillation columns and one solvent recovery column, is the best scheme from environmental and economic viewpoints. Simple partial heat integration was further implemented and can save 20.08% and 8.86% in terms of energy cost and TAC. Conclusion The results demonstrate that the separation of acetonitrile/methanol/benzene is fully achievable using common extractive distillation with chlorobenzene as solvent. Moreover, there is a trade‐off between heat transfer in the reboiler‐condenser and corresponding energy consumption variations due to pressure changes when considering heat integration. © 2018 Society of Chemical Industry

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“…Pressure-swing distillation and extractive distillation are popular methods to separate azeotropic systems. When the azeotropic composition is pressure-dependent, it is feasible to apply this method to separate azeotropes [2]. The flow sheet has two columns which need to be operated at different pressures.…”

Section: Introductionmentioning

confidence: 99%

“…The results of these schemes indicated that pressure-swing distillation is a feasible option for the separation for azeotropes. Liang et al [5] comprehensively researched the pressure-swing distillation and concluded that it is an effective method for the pressure-sensitive azeotrope system.…”

Section: Introductionmentioning

confidence: 99%

Design and Control of Heterogeneous Azeotropic Distillation for Separating 2‐Methylpyridine/Water

Chen

Liu

et al. 2018

Chem Eng & Technol

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In industrial processes, 2‐methylpyridine/water mixtures can be separated via the conventional heterogeneous azeotropic distillation (HAD) using benzene as entrainer. 2‐Methylpyridine and water can form a heterogeneous azeotrope by themselves, based on which an improved HAD process is proposed. This allows for reducing the total operating cost and total annual cost (TAC) by more than one‐tenth compared with the conventional HAD process. Two different control structures were established for the enhanced HAD process. The results indicate that applying the feedforward ratio controllers to the control structure can handle the feed disturbances and maintain product purities with smaller transient deviations and shorter settling times.

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Insight into pressure-swing distillation from azeotropic phenomenon to dynamic control

Cited by 253 publications

References 106 publications

Separation of a ternary mixture with multiple azeotropes via pressure‐swing distillation

Separation of a ternary mixture with multiple azeotropes via pressure‐swing distillation

Comparison of extractive distillation separation sequences for acetonitrile/methanol/benzene multi‐azeotropic mixtures

Design and Control of Heterogeneous Azeotropic Distillation for Separating 2‐Methylpyridine/Water

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