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Yinglong Wang - One of the best experts on this subject based on the ideXlab platform.
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control of a Pressure Swing Distillation process for benzene isopropanol water separation with and without heat integration
Separation and Purification Technology, 2020Co-Authors: Zhaoyou Zhu, Yinglong Wang, Yao Dai, Xiao Yang, Jun GaoAbstract:Abstract Controlling the behavior of processes for the recovery of benzene and isopropanol from industrial wastewater is an important topic. In this work, dynamic control structures are investigated for the separation of azeotropic water, benzene, and isopropanol mixtures using triple column Pressure-Swing Distillation (without heat integration, with partial heat integration, and with full heat integration). Composition and flow disturbances are utilized to examine the performance of the control structure, and four improved control structures are developed and show good control effects. The ratio of reboiler duty to mole feed flow rate control structure showed good control behavior in face of the disturbances for the ternary Pressure Swing Distillation processes. The integral of squared error (ISE) values of the control structure was combined with the dynamic response curves to compare the performance of the control structures. The ISE value of the improved control structure with full heat integration was smaller than that of the improved control structure without heat integration and the improved control structure with partial heat integration. The total annual cost (TAC) of the full heat integration process was also lower than the values for the other three processes. Based on its control performance and TAC, the improved control structure with full heat integration was concluded to be the best of the control structures. This work can serve as a reference for industrial development.
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Control of a Pressure-Swing Distillation process for benzene/isopropanol/water separation with and without heat integration
Separation and Purification Technology, 2020Co-Authors: Zhaoyou Zhu, Yinglong Wang, Yao Dai, Xiao Yang, Jun GaoAbstract:Abstract Controlling the behavior of processes for the recovery of benzene and isopropanol from industrial wastewater is an important topic. In this work, dynamic control structures are investigated for the separation of azeotropic water, benzene, and isopropanol mixtures using triple column Pressure-Swing Distillation (without heat integration, with partial heat integration, and with full heat integration). Composition and flow disturbances are utilized to examine the performance of the control structure, and four improved control structures are developed and show good control effects. The ratio of reboiler duty to mole feed flow rate control structure showed good control behavior in face of the disturbances for the ternary Pressure Swing Distillation processes. The integral of squared error (ISE) values of the control structure was combined with the dynamic response curves to compare the performance of the control structures. The ISE value of the improved control structure with full heat integration was smaller than that of the improved control structure without heat integration and the improved control structure with partial heat integration. The total annual cost (TAC) of the full heat integration process was also lower than the values for the other three processes. Based on its control performance and TAC, the improved control structure with full heat integration was concluded to be the best of the control structures. This work can serve as a reference for industrial development.
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Insight into separation of azeotrope in wastewater to achieve cleaner production by extractive Distillation and Pressure-Swing Distillation based on phase equilibrium
Journal of Cleaner Production, 2020Co-Authors: Yinglong Wang, Xiao Yang, Peizhe Cui, Hongru Zhang, Yuanyuan Shen, Zhengrun Chen, Lei Wang, Fanqing Meng, Jun GaoAbstract:Abstract There are a large number of azeotropes in the binary system of alkanes and alcohols in the industrial wastewater from the reaction of vanadium pentoxide with alkanes to produce alkylvanadate. In order to protect the environment, utilize resources and clean production, the extractive Distillation process with high boiling solvent as extractant is usually used to separate the azeotropes in industrial products. However, some intermediate-boiling solvents compared with the two key components to be separated are used as extractant in extractive Distillation. In this work, the binary azeotropic system of n-heptane and isoamyl alcohol in wastewater was separated by extractive Distillation with intermediate-boiling solvents, Pressure-Swing Distillation and Pressure-Swing Distillation with thermal integration. The binary interaction parameters of isoamyl alcohol and butyl acetate were obtained by correlating and regressing the experimental data of vapor-liquid equilibrium at atmospheric Pressure. Taking total annual cost minimum as the objective function, the optimal design parameters of the three processes were obtained by sequential iteration method. Compared with the extractive Distillation and Pressure-Swing Distillation, Pressure-Swing Distillation with thermal integration can save the cost up to 29.38%, increase the thermodynamic efficiency up to 445.39%, reduce the global warming potential up to 39.34% and the decrease the acidification potential up to 39.34%. This work provides an effective reference for better separation of azeotropes and wastewater treatment.
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exploration of a heat integrated Pressure Swing Distillation process with a varied diameter column for binary azeotrope separation
Chemical Engineering Communications, 2019Co-Authors: Yinglong Wang, Zhaoyou Zhu, Xiao Yang, Jun Gao, Fangkun ZhangAbstract:AbstractThe Pressure-Swing Distillation (PSD) processes with varied-diameter columns (VDCs) for separating methanol–chloroform and n-heptane–isobutanol are studied. Furthermore, two heat-integrated...
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Thermodynamic efficiency enhancement of Pressure-Swing Distillation process via heat integration and heat pump technology
Applied Thermal Engineering, 2019Co-Authors: Xueli Geng, Peizhe Cui, Zhaoyou Zhu, Jingwei Yang, Yinglong WangAbstract:Abstract Pressure-Swing Distillation was investigated to separate ethanol/acetonitrile binary azeotrope. The parameters were optimized based on the minimum total annual cost. To implement cost saving, heat pump technology was applied to Pressure-Swing Distillation process and two new Pressure-Swing Distillation processes were explored and studied. The heat-pump-assisted Pressure-Swing Distillation, which only needs a small amount of fresh heat steam, saves 62.8% of the operating cost compared with the Pressure-Swing Distillation. The other process called double-heat-pump-assisted Pressure-Swing Distillation, which needs no fresh heat steam, achieves an operating cost saving by 59.9%. To further analysis of thermodynamic efficiency, the temperature-enthalpy (T-H) diagram and stage-exergy and stage-deficit were studied. Payback period was introduced to evaluate the economy of the processes. The results showed that the payback periods of the new Pressure-Swing Distillation processes are shorter than the suggested 15-year payback period by at least 7.5 years. Both the processes perform well on operating cost saving and they were economical for separating the ethanol/acetonitrile binary azeotrope.
Zhen Zhang - One of the best experts on this subject based on the ideXlab platform.
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separation of acetonitrile methanol benzene ternary azeotrope via triple column Pressure Swing Distillation
Separation and Purification Technology, 2016Co-Authors: Dongfang Xu, Zhen Zhang, Yinglong WangAbstract:Abstract Acetonitrile/methanol/benzene mixture forms more than one different azeotropes and its triangular diagram presents several Distillation boundaries at atmospheric Pressure. A process named as triple column Pressure-Swing Distillation (TCPSD) was proposed to separate this complex ternary system. The feasibility of the process was confirmed using residue curve maps and rigorous steady-state simulations were implemented on Aspen Plus. On basis of minimum total annual cost, several operating parameters were optimized by Pressure-Swing optimization software using the sequential iterative optimization procedure and the economics of TCPSD were compared with four different separation configurations. The results demonstrated that the A-M-B separation configuration was the most optimal column sequence in global optimization to separate acetonitrile/methanol/benzene azeotropic mixture using TCPSD. TCPSD may arouse the interest of researchers in various fields and can assist engineers to select the optimal separating process.
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Separation of acetonitrile/methanol/benzene ternary azeotrope via triple column Pressure-Swing Distillation
Separation and Purification Technology, 2016Co-Authors: Zhaoyou Zhu, Zhen Zhang, Xingzhen Liu, Yinglong WangAbstract:Abstract Acetonitrile/methanol/benzene mixture forms more than one different azeotropes and its triangular diagram presents several Distillation boundaries at atmospheric Pressure. A process named as triple column Pressure-Swing Distillation (TCPSD) was proposed to separate this complex ternary system. The feasibility of the process was confirmed using residue curve maps and rigorous steady-state simulations were implemented on Aspen Plus. On basis of minimum total annual cost, several operating parameters were optimized by Pressure-Swing optimization software using the sequential iterative optimization procedure and the economics of TCPSD were compared with four different separation configurations. The results demonstrated that the A-M-B separation configuration was the most optimal column sequence in global optimization to separate acetonitrile/methanol/benzene azeotropic mixture using TCPSD. TCPSD may arouse the interest of researchers in various fields and can assist engineers to select the optimal separating process.
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extractive Distillation and Pressure Swing Distillation for thf ethanol separation
Journal of Chemical Technology & Biotechnology, 2015Co-Authors: Yinglong Wang, Peizhe Cui, Zhen ZhangAbstract:BACKGROUND During the synthesis of a liquid crystal monomer, an effluent including tetrahydrofuran(THF) and ethanol is produced. Since THF and ethanol are both important solvents used in the chemical industry, it is necessary to separate the mixture of THF and ethanol for reuse. However, it is hard to effectively separate the mixture via simple Distillation because a minimum azeotrope is formed in the binary system. RESULT Extractive Distillation and Pressure-Swing Distillation are adopted to separate the mixture and carefully optimized to achieve minimization of the total annual cost (TAC). A comparison between the two processes is carried out. Pressure-Swing Distillation is used to separate mixtures of THF and ethanol with various compositions. CONCLUSION The results indicate that Pressure-Swing Distillation performs better than extractive Distillation from the standpoint of both economic considerations and product purity. The feasible sequence of high and low Pressure of two columns in a Pressure-Swing Distillation is related to the feed composition. © 2014 Society of Chemical Industry
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control of heat integrated Pressure Swing Distillation process for separating azeotropic mixture of tetrahydrofuran and methanol
Industrial & Engineering Chemistry Research, 2015Co-Authors: Zhen Zhang, Huan Zhang, Qing ZhangAbstract:Dynamic control of a Pressure-Swing-Distillation process for separation of azeotropic mixture of tetrahydrofuran and methanol is explored. The Pressure-Swing-Distillation processes involved with no, partial, and full heat integration are simulated using Aspen Plus Dynamics. The influences of the selection of the sensitive temperature stage in the low-Pressure column on the dynamic responses in the Pressure-Swing Distillation with different heat integration were investigated. The results indicate that a suitable temperature control stage in the low-Pressure column is crucial to achieve efficient control of the process. In addition, more time is needed to reach the quality specifications under feed disturbances for both components when heat integration is added in the Distillation sequence.
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Extractive Distillation and Pressure‐Swing Distillation for THF/ethanol separation
Journal of Chemical Technology & Biotechnology, 2014Co-Authors: Yinglong Wang, Peizhe Cui, Zhen ZhangAbstract:BACKGROUND During the synthesis of a liquid crystal monomer, an effluent including tetrahydrofuran(THF) and ethanol is produced. Since THF and ethanol are both important solvents used in the chemical industry, it is necessary to separate the mixture of THF and ethanol for reuse. However, it is hard to effectively separate the mixture via simple Distillation because a minimum azeotrope is formed in the binary system. RESULT Extractive Distillation and Pressure-Swing Distillation are adopted to separate the mixture and carefully optimized to achieve minimization of the total annual cost (TAC). A comparison between the two processes is carried out. Pressure-Swing Distillation is used to separate mixtures of THF and ethanol with various compositions. CONCLUSION The results indicate that Pressure-Swing Distillation performs better than extractive Distillation from the standpoint of both economic considerations and product purity. The feasible sequence of high and low Pressure of two columns in a Pressure-Swing Distillation is related to the feed composition. © 2014 Society of Chemical Industry
Ao Yang - One of the best experts on this subject based on the ideXlab platform.
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investigation of energy efficient and sustainable reactive Pressure Swing Distillation processes to recover tetrahydrofuran and ethanol from the industrial effluent
Separation and Purification Technology, 2020Co-Authors: Ao Yang, Yang Su, Liumei Teng, Teng Zhou, Weifeng ShenAbstract:Abstract In this work, we report an approach for conceptual design and optimization of an energy-saving and sustainable reactive/Pressure-Swing Distillation process to separate a ternary mixture tetrahydrofuran/ethanol/water with three azeotropes. The novel reactive/Pressure-Swing Distillation schemes with two different separation sequences are proposed via the thermodynamic feasibility analysis. In these processes, the component of water in the ternary system is firstly removed by adding a reactant in the reactive Distillation column and the remaining binary azeotropic mixture is then separated via the Pressure-Swing Distillation. An improved genetic algorithm is employed for optimizing the proposed processes. Furthermore, the heat integration approach is adopted to further reduce the energy consumption. The evaluations illustrate that total annual cost and CO2 emissions of the proposed processes based on the proposed reactive/Pressure-Swing Distillation with (and without) heat integration schemes could be significantly reduced by 50.16% (54.80%) and 53.00% (59.11%), and total net revenue could be decently increased with 12.19% (12.40%), compared with the existing triple-column Pressure-Swing Distillation process. In addition, the thermodynamic efficiency of the existing process is significantly improved via the proposed reactive Distillation processes.
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Investigation of energy-efficient and sustainable reactive/Pressure-Swing Distillation processes to recover tetrahydrofuran and ethanol from the industrial effluent
Separation and Purification Technology, 2020Co-Authors: Ao Yang, Liumei Teng, Teng Zhou, Saimeng Jin, Weifeng ShenAbstract:Abstract In this work, we report an approach for conceptual design and optimization of an energy-saving and sustainable reactive/Pressure-Swing Distillation process to separate a ternary mixture tetrahydrofuran/ethanol/water with three azeotropes. The novel reactive/Pressure-Swing Distillation schemes with two different separation sequences are proposed via the thermodynamic feasibility analysis. In these processes, the component of water in the ternary system is firstly removed by adding a reactant in the reactive Distillation column and the remaining binary azeotropic mixture is then separated via the Pressure-Swing Distillation. An improved genetic algorithm is employed for optimizing the proposed processes. Furthermore, the heat integration approach is adopted to further reduce the energy consumption. The evaluations illustrate that total annual cost and CO2 emissions of the proposed processes based on the proposed reactive/Pressure-Swing Distillation with (and without) heat integration schemes could be significantly reduced by 50.16% (54.80%) and 53.00% (59.11%), and total net revenue could be decently increased with 12.19% (12.40%), compared with the existing triple-column Pressure-Swing Distillation process. In addition, the thermodynamic efficiency of the existing process is significantly improved via the proposed reactive Distillation processes.
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energy efficient extractive Pressure Swing Distillation for separating binary minimum azeotropic mixture dimethyl carbonate and ethanol
Separation and Purification Technology, 2019Co-Authors: Ao Yang, Shirui Sun, Tao Shi, Jingzheng Ren, Weifeng ShenAbstract:Abstract An energy-efficient extractive Pressure-Swing Distillation process is proposed for separating binary minimum azeotropic mixture ethanol and dimethyl carbonate. It can be observed that the minimum amount flow rate of entrainer will be decreased when the operating Pressure of extractive Distillation column is increased via the thermodynamic feasibility insights (i.e., residue curve map and isovolatility lines). Therefore, an extractive Pressure-Swing Distillation process with 4 bar for the extractive Distillation column is designed. Process variables of the proposed design are optimized by combining the sensitivity analysis and sequence quadratic program approaches with minimum total annual cost as objective function. Total annual cost, CO2 emissions, and exergy loss of the optimized extractive Pressure-Swing Distillation with 4 bar for the extractive Distillation column is reduced by 44.09%, 44.16% and 41.54%, respectively when compared with the existing process with 1 bar for the extractive Distillation column, which mainly attributing the flow rate of entrainer decreasing from 200.020 kmol/h to 44.963 kmol/h. Furthermore, the extractive Pressure-Swing Distillation with heat integration is studied to further reduce energy cost because the enough heat transfer temperature difference could be provided by increasing operation Pressure.
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design and control of Pressure Swing Distillation for separating ternary systems with three binary minimum azeotropes
Aiche Journal, 2019Co-Authors: Ao Yang, Weifang Shen, Lichun Dong, Jie Li, Vincent GerbaudAbstract:The separation of ternary nonideal systems with multi‐azeotrope is very important because they are often found in the waste of chemical and pharmaceutical industries, which is much more difficult due to the formation of multi‐azeotrope and Distillation boundary. We propose a systematic procedure for design and control of a triple‐column Pressure‐Swing Distillation for separating ternary systems with three binary minimum azeotropes. This procedure involves thermodynamic insights, a two‐step optimization method, and effective control strategy. The separation of tetrahydrofuran (THF)/ethanol/water is used to illustrate the capability of the proposed procedure. It is found that the Pressure limits in columns can be determined through the analysis of residue curve maps, Distillation boundary, and isovolatility curves. The optimal triple‐column Pressure‐Swing Distillation is generated with the minimum total annual cost (TAC) of $2.181 × 106 in sequence A. The operating conditions are well controlled approaching their desired specifications in an acceptable time when disturbances occur.
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Design and control of Pressure‐Swing Distillation for separating ternary systems with three binary minimum azeotropes
AIChE Journal, 2019Co-Authors: Ao Yang, Weifang Shen, Lichun Dong, Shun An Wei, Vincent GerbaudAbstract:The separation of ternary nonideal systems with multi‐azeotrope is very important because they are often found in the waste of chemical and pharmaceutical industries, which is much more difficult due to the formation of multi‐azeotrope and Distillation boundary. We propose a systematic procedure for design and control of a triple‐column Pressure‐Swing Distillation for separating ternary systems with three binary minimum azeotropes. This procedure involves thermodynamic insights, a two‐step optimization method, and effective control strategy. The separation of tetrahydrofuran (THF)/ethanol/water is used to illustrate the capability of the proposed procedure. It is found that the Pressure limits in columns can be determined through the analysis of residue curve maps, Distillation boundary, and isovolatility curves. The optimal triple‐column Pressure‐Swing Distillation is generated with the minimum total annual cost (TAC) of $2.181 × 106 in sequence A. The operating conditions are well controlled approaching their desired specifications in an acceptable time when disturbances occur.
Jixin Qian - One of the best experts on this subject based on the ideXlab platform.
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Adding rectifying/stripping section type heat integration to a Pressure-Swing Distillation (PSD) process
Applied Thermal Engineering, 2008Co-Authors: Kejin Huang, Lan Shan, Qunxiong Zhu, Jixin QianAbstract:This paper studies the economical effect of considering rectifying/stripping section type heat integration in a Pressure-Swing Distillation (PSD) process separating a binary homogeneous Pressure-sensitive azeotrope. The schemes for arranging heat integration between the rectifying section and the stripping section of the high- and low-Pressure Distillation columns, respectively, are derived and an effective procedure is devised for the conceptual process design of the heat-integrated PSD processes. In terms of the separation of a binary azeotropic mixture of acetonitrile and water, intensive comparisons are made between the conventional and heat-integrated PSD processes. It is demonstrated that breaking a Pressure-sensitive azeotropic mixture can be made more economical than the current practice with the conventional PSD process. For boosting further the thermodynamic efficiency of a PSD process, it is strongly suggested to consider simultaneously the condenser/reboiler type heat integration with the rectifying/stripping section type heat integration in process synthesis and design.
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adding rectifying stripping section type heat integration to a Pressure Swing Distillation psd process
Applied Thermal Engineering, 2008Co-Authors: Kejin Huang, Lan Shan, Qunxiong Zhu, Jixin QianAbstract:This paper studies the economical effect of considering rectifying/stripping section type heat integration in a Pressure-Swing Distillation (PSD) process separating a binary homogeneous Pressure-sensitive azeotrope. The schemes for arranging heat integration between the rectifying section and the stripping section of the high- and low-Pressure Distillation columns, respectively, are derived and an effective procedure is devised for the conceptual process design of the heat-integrated PSD processes. In terms of the separation of a binary azeotropic mixture of acetonitrile and water, intensive comparisons are made between the conventional and heat-integrated PSD processes. It is demonstrated that breaking a Pressure-sensitive azeotropic mixture can be made more economical than the current practice with the conventional PSD process. For boosting further the thermodynamic efficiency of a PSD process, it is strongly suggested to consider simultaneously the condenser/reboiler type heat integration with the rectifying/stripping section type heat integration in process synthesis and design.
William L Luyben - One of the best experts on this subject based on the ideXlab platform.
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comparison of flowsheets for thf water separation using Pressure Swing Distillation
Computers & Chemical Engineering, 2018Co-Authors: William L LuybenAbstract:Abstract An eloquent optimization method was recently proposed and tested on the separation of tetrahydrofuran and water using Pressure-Swing Distillation. The purpose of this paper is to compare the results of this rigorous optimum design with the design presented in a 1985 paper, which used heuristic engineering optimization. The new design uses more feed preheating in the low-Pressure column and a higher Pressure with more trays in the high-Pressure column. Simulation results show that the old design has a 14% lower energy cost.
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Comparison of flowsheets for THF/water separation using Pressure-Swing Distillation
Computers & Chemical Engineering, 2018Co-Authors: William L LuybenAbstract:Abstract An eloquent optimization method was recently proposed and tested on the separation of tetrahydrofuran and water using Pressure-Swing Distillation. The purpose of this paper is to compare the results of this rigorous optimum design with the design presented in a 1985 paper, which used heuristic engineering optimization. The new design uses more feed preheating in the low-Pressure column and a higher Pressure with more trays in the high-Pressure column. Simulation results show that the old design has a 14% lower energy cost.
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methanol trimethoxysilane azeotrope separation using Pressure Swing Distillation
Industrial & Engineering Chemistry Research, 2014Co-Authors: William L LuybenAbstract:The process to produce trimethoxysilane involving the reaction of methanol with silicon produces a mixture of unreacted methanol and trimethoxysilane that requires separation so that the methanol can be recycled back to the reaction section. This binary mixture forms a maximum-boiling homogeneous azeotrope of 28.65 mol % methanol at 1 bar and 87.94 °C. The composition of the azeotrope changes fairly significantly with Pressure, so separation into high-purity component streams is viable using Pressure-Swing Distillation. The purpose of this paper is to design a Pressure -Swing Distillation process for this separation that uses heat integration of the two columns, which operate at different Pressures and different temperatures. One of the unique features of this system is the use of a vacuum column in which tray Pressure drop has a significant effect on the optimum selection of design parameters such as the number of trays. The specifications for the bottoms compositions must be adjusted as Pressures are ch...
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Methanol/Trimethoxysilane Azeotrope Separation Using Pressure-Swing Distillation
Industrial & Engineering Chemistry Research, 2014Co-Authors: William L LuybenAbstract:The process to produce trimethoxysilane involving the reaction of methanol with silicon produces a mixture of unreacted methanol and trimethoxysilane that requires separation so that the methanol can be recycled back to the reaction section. This binary mixture forms a maximum-boiling homogeneous azeotrope of 28.65 mol % methanol at 1 bar and 87.94 °C. The composition of the azeotrope changes fairly significantly with Pressure, so separation into high-purity component streams is viable using Pressure-Swing Distillation. The purpose of this paper is to design a Pressure -Swing Distillation process for this separation that uses heat integration of the two columns, which operate at different Pressures and different temperatures. One of the unique features of this system is the use of a vacuum column in which tray Pressure drop has a significant effect on the optimum selection of design parameters such as the number of trays. The specifications for the bottoms compositions must be adjusted as Pressures are ch...
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Comparison of extractive Distillation and Pressure-Swing Distillation for acetone/chloroform separation
Computers & Chemical Engineering, 2013Co-Authors: William L LuybenAbstract:Two of the most common methods for separating a binary homogeneous azeotrope are Pressure-Swing Distillation and extractive Distillation. The former is effective if the composition of the azeotrope changes significantly with Pressure. The latter method is effective if a suitable solvent can be found. This paper compares the steady-state design and the dynamic control of these two methods when applied to the acetone-methanol binary system. The minimum-boiling azeotrope at 1 atm contains 77.6 mol % acetone at 328 K. At 10 atm the azeotropic composition is 37.5 mol % acetone at 408 K, so Pressure-Swing separation is feasible. Extractive Distillation is also feasible using water as the solvent. Both systems require two Distillation columns. Purities of the two products are set at 99.5 mol %. Results show that the extractive Distillation system has a 15% lower total annual cost. However, a third component (water) is introduced that appears as trace impurities in both the acetone and methanol products. It is al...