Effect of multi-recycle streams on triple-column pressure-swing distillation optimization

Zhu, Zhaoyou; Xu, Dongfang; Wang, Yongkun; Geng, Xueli; Wang, Yinglong

doi:10.1016/j.cherd.2017.09.026

Cited by 19 publications

(8 citation statements)

References 42 publications

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“…As a conventional PSD to separate this mixture, there are a total of six conceptual sequences according to the separating order of the three components (refer to Figure S6 in Supporting Information). Each sequence has one recycled stream for full separation into pure products 50 . In the first column of each sequence, the node component in the initial feed‐containing region should be separated.…”

Section: Case Studies: Pinch Pressure Determination and Hipsd Designmentioning

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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Section: Case Studies: Pinch Pressure Determination and Hipsd Designmentioning

confidence: 99%

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

et al. 2021

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“…Pressure-swing distillation (PSD) has been widely used to separate azeotropes. − The dynamic controllability of PSD for separating azeotropes has been investigated in many aspects, including both partially heat-integrated PSD − (PHI-PSD) and fully heat-integrated PSD − for separating binary minimum-boiling azeotropes, PHI-PSD for separating binary maximum-boiling azeotropes, − PSD with vapor recompression, and entrainer-assisted PSD (EA-PSD) for separating pressure-insensitive binary azeotropes − and triple-column PSD for separating ternary azeotropic mixtures …”

Section: Introductionmentioning

confidence: 99%

Improving the Dynamic Performance of Entrainer-Assisted Pressure-Swing Distillation: Control Modes of the Recycling or Connecting Stream and Application of High-Selectors

2019

Ind. Eng. Chem. Res.

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Entrainer-assisted pressure-swing distillation (EA-PSD) is an effective method for separating pressure-insensitive azeotropes, including both minimum-boiling and maximum-boiling azeotropes. The minimum-boiling azeotrope methanol/toluene can be separated by introducing chloroform as a light entrainer (Ind. Eng. Chem. Res.20175640174037). However, the methanol product purity of the proposed control strategy shows large negative transient deviations or steady-state deviations under some disturbances. The maximum-boiling azeotrope phenol/cyclohexanone can be separated by introducing acetophenone as a heavy entrainer (Ind. Eng. Chem. Res.20135278367853). However, the proposed control strategy involves an online composition controller. In this research, efforts are made to improve the dynamic performance of both EA-PSD processes. New control strategies are classified and established based on the different control modes of the recycling or connecting stream, which is flow controlled at a constant initial value or manipulated to control a certain reflux drum level or base level. Then they are compared with the previous control strategy in which the recycling or connecting stream flow rate is directly proportional to the feed flow rate. The results show that eliminating the ratio of the recycling or connecting stream flow rate to the feed flow rate can lead to better results. In addition, high-selectors can be applied to the deliberately selected feedback control loops of the reflux flow rate or reboiler duty to further improve the dynamic performance. There are a total of 14 control structures for both EA-PSD processes. Overall comparisons and analyses are made for these control structures. The diverse effective control structures are valuable in practice for the control of EA-PSD for separating both minimum-boiling and maximum-boiling azeotropes.

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“…The focus of this work is to illustrate the possible applications of these intensified alternative configurations in the separation of multiazeotropic mixtures with as an example of acetonitrile/methanol/benzene. To the best of our knowledge, only a few studies on pressure swing distillation have been reported for this system containing three binary azeotropes. − In this work, two novel thermal coupled configurations, namely, extended-EDWC and extended-SEDC, were developed for this specific separation with chlorobenzene as a solvent and compared with the configuration of conventional extractive distillation (CED) from two aspects of economic and controllability. The optimization of sequential iterative search was carried out to minimize the total annual cost (TAC).…”

Section: Introductionmentioning

confidence: 99%

Economics and Controllability of Conventional and Intensified Extractive Distillation Configurations for Acetonitrile/Methanol/Benzene Mixtures

Wang

Cui

et al. 2018

Ind. Eng. Chem. Res.

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For the industrial separation problem of acetonitrile/methanol/benzene involving three azeotropes, this article proposes two novel intensified configurations with chlorobenzene as solvent by extending the extractive dividing-wall column (EDWC) and side-stream extractive distillation column (SEDC) from single azeotropic to multiazeotropic mixtures and makes a comparison with a conventional extractive distillation (CED) configuration in aspects of economic and controllability. Steady-state designs are optimized via using the sequential iterations search based on minimum total annual cost (TAC). The results show that extended-EDWC and extended-SEDC compared to CED can reduce TAC by 6.32% and 14.39% and energy consumption by 4.26% and 20.59%, respectively. As far as controllability is concerned, all proposed control structures can hold products at high purities with acceptable deviations and short settle time after introducing feed flow and composition disturbances. Overall, apparent economic benefits and high energy efficiency provided by the extended-SEDC configuration can be achieved without a deterioration of control behavior for some multiazeotropic mixtures.

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Effect of multi-recycle streams on triple-column pressure-swing distillation optimization

Cited by 19 publications

References 42 publications

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

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

Improving the Dynamic Performance of Entrainer-Assisted Pressure-Swing Distillation: Control Modes of the Recycling or Connecting Stream and Application of High-Selectors

Economics and Controllability of Conventional and Intensified Extractive Distillation Configurations for Acetonitrile/Methanol/Benzene Mixtures

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