Design and control of an energy-efficient alternative process for separation of Dichloromethane-Methanol binary azeotropic mixture

Iqbal, Asma; Ahmad, Syed Akhlaq; Ojasvi,

doi:10.1016/j.seppur.2019.03.005

Cited by 23 publications

(37 citation statements)

References 35 publications

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“…Such a rate is projected to be triple in Asia than in the U.S.A. and Canada. 1 However, these surges in the pharmaceutical production capacity globally translate to a higher volume of effluent discharge. One such waste effluent is the binary mixture of dichloromethane and methanol that are commonly discharged from the manufacturing of prednisolone, 2,3 which present potential threats to human health and environment.…”

Section: Introductionmentioning

confidence: 99%

“…To date, our literature survey has indicated that although there are myriad studies for the separation of different azeotropic mixtures using various special distillation techniques (the details of which have been made available in our review paper 12 ), there are only two existing studies in the literature which worked on the separation process for the binary mixture containing dichloromethane and methanol. The first study 3 relied on the pressure swing batch distillation (PSBD) with heat-integration for the separation of binary mixture whereas the second study 1 focused on the continuous distillationbased processes that includes PSD, AD, and CED, in an attempt to improve the separation efficiency of the PSBD from the first work. 3 Analysing the results from both studies, 1,3 it was revealed that the CED is the best process as it provides the lowest energy consumption and total annual cost (TAC) in comparison to the heat-integrated PSBD by about 5% and 27.62%, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Towards sustainable separation and recovery of dichloromethane and methanol azeotropic mixture through process design, control, and intensification

Kong

Yang

Segovia‐Hernández

et al. 2022

J of Chemical Tech & Biotech

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Background Here we analysed the possibility of improving the sustainability performance for the recovery of dichloromethane and methanol from a binary azeotropic mixture using different energy‐intensified extractive distillation‐based processes: side‐stream extractive distillation (SSED), thermally coupled extractive distillation (TCED), and extractive dividing wall column (EDWC). The sustainability performance of the different processes was analysed based on three main factors: total annual cost (TAC), CO2 emissions, and condition number. Results The EDWC was found to give the best improvement in terms of TAC and CO2 emissions by about 18% and 21%, relative to conventional extractive distillation (CED). These however were traded‐off by the increase in conditional number (CN) by 186 times, signifying a complex dynamic characteristic for the EDWC. Thus, the SSED was suggested as an alternative sustainable option as it also provides significant improvement in TAC and CO2 emissions by about 11%, and 18% with respect to the CED, whilst providing the least reduction in operational controllability, as evidenced by the marginal increase in the CN of about 1.5 times. We also investigated the dynamic performance of the SSED and found that the SSED provides identical dynamic performance in handling both ±10% throughput and ±5% feed composition disturbances as those of the CED. Conclusion Among the different processes, SSED is the best sustainable alternative that provides compromised steady‐state (i.e. TAC and CO2 emissions) and dynamic (i.e. control) performance for the recovery of dichloromethane and methanol. © 2022 Society of Chemical Industry (SCI).

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Towards sustainable separation and recovery of dichloromethane and methanol azeotropic mixture through process design, control, and intensification

Kong

Yang

Segovia‐Hernández

et al. 2022

J of Chemical Tech & Biotech

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“…Conventional Extractive Distillation. The design of the conventional extractive distillation flow sheet used herein is adapted from that presented by Iqbal et al 18 Process parameters in their work have been optimized based on economy. Therefore, the same process parameters and design specifications are introduced into the CED process in this paper.…”

Section: Process Studymentioning

confidence: 99%

“…Thus, the sweet spots of Vr and NT1 are 0.84 and 22, respectively. For a safe operation margin under the disturbances of throughput and composition, the solvent flow rate is set to 48 kmol/h (20% higher than the minimum value 18 ), which is consistent with that used in the CED process. The TAC increases slightly with the increase of solvent temperature.…”

Section: Optimization Variables and Procedurementioning

confidence: 99%

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Extractive Dividing-Wall Column Distillation with a Novel Control Structure Integrating Pressure Swing and Pressure Compensation

Jing

Zhu

Dang

et al. 2021

Ind. Eng. Chem. Res.

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In this work, an energy-efficient extractive dividingwall column process with heat integration (E-DWC-HI) is proposed for the first time to separate the dichloromethane (DCM)−methanol (MeOH) azeotrope, which is a widely existing waste effluent in the pharmaceutical industry. The result of economic evaluation shows that the E-DWC-HI process is a preferred choice for the separation of DCM−MeOH mixture. Designing a robust control strategy is essential for the E-DWC-HI process. Thus, four control structures are proposed and tested under the disturbances of ±20% feed flow rate and ±5% feed composition. The basic control structure (CS1) and the double temperature difference control structure (CS2) both have a fixed vapor split. The dynamic response shows that the required purity cannot be met due to the loss of an important control degree of freedom. In CS3, variable vapor split is carried out by adjusting the pressures on the two sides of the dividing wall, and all product purities are held close to their set points except for MeOH product purity with an obvious offset. The dynamic performance of CS4 has been significantly improved by integrating pressure swing and pressure compensation. The offset of MeOH product purity is significantly reduced from 2.05 to 0.03%.

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Heterogeneous Azeotropic Extractive Coupled Heat Pump Distillation for Triethylamine‐Dichloromethane‐Acetone‐Water

et al. 2022

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There are three kinds of binary azeotropes and one kind of a near‐boiling compound with clamping zone characteristics in the triethylamine‐dichloromethane‐acetone‐water system, which belongs to complex quaternary systems. A four‐column distillation process of heterogeneous azeotropic extraction for the separation of the system was designed, simulated, and optimized to obtain more suitable process parameters and energy consumption distribution of each column. On this basis, taking the total annual cost (TAC) as the comprehensive economic evaluation index and CO2 emission as the environmental evaluation index, the thermal integration technology and mechanical vapor recompression (MVR) heat pump technology were applied to the energy‐saving research of the distillation process for the system. The results indicate that compared with the conventional four‐column heterogeneous azeotropic extractive distillation process, the thermal integration distillation process and single‐column MVR heat pump coupled thermal integration distillation process can save energy consumption and TAC, and it can reduce CO2 emission.

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Design and control of an energy-efficient alternative process for separation of Dichloromethane-Methanol binary azeotropic mixture

Cited by 23 publications

References 35 publications

Towards sustainable separation and recovery of dichloromethane and methanol azeotropic mixture through process design, control, and intensification

Towards sustainable separation and recovery of dichloromethane and methanol azeotropic mixture through process design, control, and intensification

Extractive Dividing-Wall Column Distillation with a Novel Control Structure Integrating Pressure Swing and Pressure Compensation

Heterogeneous Azeotropic Extractive Coupled Heat Pump Distillation for Triethylamine‐Dichloromethane‐Acetone‐Water

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