A semicontinuous approach for heterogeneous azeotropic distillation processes

Tabari, Amir; Ahmad, Arshad

doi:10.1016/j.compchemeng.2014.12.005

Cited by 31 publications

(12 citation statements)

References 33 publications

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“…For the separation of the former, pressure‐swing distillation, azeotropic distillation, and extractive distillation are studied to perform efficiently. Principally, many homoazeotropes are separated by adding an entrainer which could form heteroazeotropes with at least one component of the original mixtures in the continuous distillation and batch distillation . Chien et al applied cyclohexane which could form heteroazeotrope with water to separate isopropyl alcohol/water homoazeotropic system and they used bifurcation analysis and dynamic simulation to implement robust control.…”

Section: Introductionmentioning

confidence: 99%

“…Principally, many homoazeotropes are separated by adding an entrainer which could form heteroazeotropes with at least one component of the original mixtures in the continuous distillation [20][21][22][23][24] and batch distillation. [25][26][27][28] Chien et al 29 applied cyclohexane which could form heteroazeotrope with water to separate isopropyl alcohol/water homoazeotropic system and they used bifurcation analysis and dynamic simulation to implement robust control. Then Chien et al 30 optimized the two-column approach to separate the mixture based on total annual cost (TAC) and found that it is more economical compared with the three-column approach.…”

Section: Introductionmentioning

confidence: 99%

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Optimization of decanter temperature in separating partially miscible homoazeotrope to reduce cost and energy consumption

Wang

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND There is a special type of azeotrope in the chemical industry. The components can form homoazeotrope under atmospheric pressure and azeotropic temperature but show partial miscibility when the temperature decreases. A two‐column/decanter process was presented to separate the mixture. However, the energy consumption and the total annual cost are high. RESULTS Based on the decanter temperature, the operating parameters of the conventional process and the modified process were optimized to achieve the minimum total annual cost (TAC). Through comparing the two processes, the minimum TAC of the latter one is 14.2% lower than that of the former one when the decanters of the two processes are at 10 °C. A control structure, which can efficiently control the modified process, was also explored and verified. CONCLUSION For the conventional process and the modified process, the influences of the decanter temperature on the compositions of the layered liquid phases, the total reboiler duty of the columns, and the minimum TAC demonstrated that the decanter temperature has important impacts on energy cost and economy of the two processes. Furthermore, the modified process using two cooling media in combination can further reduce the TAC. © 2019 Society of Chemical Industry

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimization of decanter temperature in separating partially miscible homoazeotrope to reduce cost and energy consumption

Wang

et al. 2019

J of Chemical Tech & Biotech

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“…According to whether the entrainer can form two liquid phases with one or several components in the system to be separated, azeotropic distillation can be divided into homogeneous azeotropic distillation and heterogeneous azeotropic distillation. The third component (azeotropic agent) is added to the heterogeneous azeotropic distillation to form two liquid phases with the original components, which are layered by a phase separator to azeotrope and target components [7] [8]. The separation is carried out and the recovered azeotrope can be recycled.…”

Section: Introductionmentioning

confidence: 99%

Research Progress on Azeotropic Distillation Technology

Guo¹,

Wang²

2019

ACES

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Azeotropic distillation is a special distillation method for separating liquid mixtures, which has better distillation effect and obvious advantages of energy saving and consumption reduction compared with traditional distillation. In this paper, the latest research progress of azeotropic distillation technology in separation, synthesis and energy saving at home and abroad is reviewed. The research progress in separation is reflected in product separation and product purification, and the research progress in energy saving is reflected in heat pump distillation and dividing wall column distillation respectively. Existing studies have shown that azeotropic distillation technology can produce higher purity target products than conventional distillation for the separation and purification of azeotropic or near-boiling compounds. Heat pump distillation and dividing wall column distillation are used in azeotropic distillation field, resulting in obvious energy-saving effect for distillation equipment. The follow-up research direction of new separation technology with the goal of reducing energy consumption and exploring new materials as entraining agents should be studied in detail, which provides certain guidance for the development of distillation technology in China's chemical industry.

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“…The improved control structure showed good performance in handling feed disturbances. The dynamic control strategy of the HAD process was also investigated by other researchers [18][19][20][21][22][23]. However, the control structure of binary heterogeneous azeotropic system to date is rarely reported.…”

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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A semicontinuous approach for heterogeneous azeotropic distillation processes

Cited by 31 publications

References 33 publications

Optimization of decanter temperature in separating partially miscible homoazeotrope to reduce cost and energy consumption

Optimization of decanter temperature in separating partially miscible homoazeotrope to reduce cost and energy consumption

Research Progress on Azeotropic Distillation Technology

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

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