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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 an energy saving side stream Extractive Distillation process with different disturbance conditions
Separation and Purification Technology, 2019Co-Authors: Mengxiao Yu, Yinglong WangAbstract:Abstract It is important to study the dynamic controllability for the side-stream Extractive Distillation due to its superiority of energy saving. Control structures of the side-stream Extractive Distillation process are special and complex due to the instability of side-stream flow rate. In this work, the dynamic control of the side-stream Extractive Distillation was explored for separating azeotropic mixture of acetone and methanol. The detailed control structures were used to investigate the control strategies of side-stream Extractive Distillation. During the whole design process, the control of flow rate on side stream is a key factor for achieving this process efficient control. A new control structure combining a component controller and a side-stream throughput valve was proposed to achieve good dynamic performance for the side-stream Extractive Distillation process when ±10% disturbances were introduced, but it is difficult to control the ±20% feed disturbances. In addition, the side-stream Extractive Distillation takes about a longer time to reach a steady state while maintaining the purity of products, compared with conventional process. Research on control performance is of great significance to the development of energy saving technology for side-stream Extractive Distillation.
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A review of Extractive Distillation from an azeotropic phenomenon for dynamic control
Chinese Journal of Chemical Engineering, 2019Co-Authors: Peizhe Cui, Zhaoyou Zhu, Yinglong Wang, Wang Yongkun, Jun GaoAbstract:Abstract Extractive Distillation is an effective method for separating azeotropic or close boiling point mixtures by adding a third component. Various technologies for performing the Extractive Distillation process have been explored to protect the environment and save resources. This paper focuses on the improvement of these advanced technologies in recent years. Extractive Distillation is retrieved and analyzed from the view of phase equilibrium, selection of solvent in Extractive Distillation, process design, energy conservation, and dynamic control. The quantitative structure–property relationship used in Extractive Distillation is discussed, and the future development of Extractive Distillation is proposed to determine how the solvent affects the relative volatility of the separated mixture. In the steady state design, the relationship between the curvature of the residue curve and parameters of the optimal steady state is also highlighted as another field worthy of further study to simplify the Distillation process.
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energy saving thermally coupled ternary Extractive Distillation process by combining with mixed entrainer for separating ternary mixture containing bioethanol
Energy, 2018Co-Authors: Yongteng Zhao, Zhaoyou Zhu, Yinglong Wang, Wenting Bai, Jun GaoAbstract:Abstract The major intrinsic obstacle of Extractive Distillation is the high energy consumption. It is an actual problem for reducing energy consumption of Extractive Distillation processes. Two thermally coupled ternary Extractive Distillation processes were studied to separate the ternary azeotropic mixture tetrahydrofuran/ethanol/water using a single component solvent (dimethyl sulfoxide) and a mixed solvent (dimethyl sulfoxide and ethylene glycol) as entrainer. The optimal conditions of all ternary Extractive Distillation processes were obtained based on the minimal total annual cost. Thermodynamic efficiency and CO2 emissions index were also considered to evaluate the energy efficiency and environmental impact of alternative ternary Extractive Distillation processes. The results show that the use of mixed entrainer can result in reduction in both energy consumption and total annual cost for the same ternary Extractive Distillation configuration. Comparisons of the conventional ternary Extractive Distillation process and thermally coupled ternary Extractive Distillation process 1 (combining Extractive Distillation column with entrainer-recovery column) with mixed entrainer show that a thermally coupled Extractive Distillation sequence with a side rectifier present the best results. However, thermally coupled ternary Extractive Distillation process 2 (combining Extractive Distillation column with entrainer-recovery column) does not show good result due to existence of remixing effect.
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Control of a Ternary Extractive Distillation Process with Recycle Splitting Using a Mixed Entrainer
Industrial & Engineering Chemistry Research, 2017Co-Authors: Xia Zhang, Zhaoyou Zhu, Yongteng Zhao, Huixin Wang, Bin Qin, Nan Zhang, Yinglong WangAbstract:Dynamic control of the ternary Extractive Distillation process is complex, due to the relatively high number of operating parameters and interactions between multiple azeotropes. In this research, the control structures of the ternary Extractive Distillation using dimethyl sulfoxide and a mixed solvent of dimethyl sulfoxide and ethylene glycol, as the entrainer, were explored for separating tetrahydrofuran/ethanol/water. A composition with a ratio of reboiler duty to mole feed flow rate control structure was proposed to obtain good dynamic responses for the ternary Extractive Distillation process with dimethyl sulfoxide and mixed entrainer. Moreover, control comparisons of the ternary Extractive Distillation with dimethyl sulfoxide and mixed entrainer demonstrated that the dynamic performances of the Extractive Distillation with mixed entrainer were better compared with the process using dimethyl sulfoxide. These studies contribute to the development of controllability for ternary Extractive Distillation ...
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Extractive Distillation for ethanol dehydration using imidazolium-based ionic liquids as solvents
Chemical Engineering and Processing: Process Intensification, 2016Co-Authors: Zhaoyou Zhu, Yongsaeng Ri, Hui Jia, Yongkun Wang, Min Li, Yinglong WangAbstract:An Extractive Distillation process was investigated, comparing the imidazolium-based ionic liquids [EMIM][BF4] and [BMIM][BF4] as solvents for ethanol dehydration. An Aspen Plus process simulator was used to simulate the feasibility of the ionic liquid-based Extractive Distillation (ILED) process and determine the main operating conditions of anhydrous ethanol production. User-defined ionic liquid components were created in Aspen Plus, with the required thermodynamic and physical property parameters. The NRTL model was used to calculate the thermodynamic properties. The proposed process and methodology using [EMIM][BF4] as the solvent was applied to evaluate the potential of Extractive Distillation for ethanol dehydration. The results show that the distillate purity of ethanol was higher than 99.9 mol% and revealed the advantage of decreased energy requirements compared with the Extractive Distillation process using conventional solvents. The ILED process design obtained from the sensitivity analysis for minimum energy consumption presented a lower total annual cost (TAC).
Zhaoyou Zhu - One of the best experts on this subject based on the ideXlab platform.
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A review of Extractive Distillation from an azeotropic phenomenon for dynamic control
Chinese Journal of Chemical Engineering, 2019Co-Authors: Peizhe Cui, Zhaoyou Zhu, Yinglong Wang, Wang Yongkun, Jun GaoAbstract:Abstract Extractive Distillation is an effective method for separating azeotropic or close boiling point mixtures by adding a third component. Various technologies for performing the Extractive Distillation process have been explored to protect the environment and save resources. This paper focuses on the improvement of these advanced technologies in recent years. Extractive Distillation is retrieved and analyzed from the view of phase equilibrium, selection of solvent in Extractive Distillation, process design, energy conservation, and dynamic control. The quantitative structure–property relationship used in Extractive Distillation is discussed, and the future development of Extractive Distillation is proposed to determine how the solvent affects the relative volatility of the separated mixture. In the steady state design, the relationship between the curvature of the residue curve and parameters of the optimal steady state is also highlighted as another field worthy of further study to simplify the Distillation process.
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energy saving thermally coupled ternary Extractive Distillation process by combining with mixed entrainer for separating ternary mixture containing bioethanol
Energy, 2018Co-Authors: Yongteng Zhao, Zhaoyou Zhu, Yinglong Wang, Wenting Bai, Jun GaoAbstract:Abstract The major intrinsic obstacle of Extractive Distillation is the high energy consumption. It is an actual problem for reducing energy consumption of Extractive Distillation processes. Two thermally coupled ternary Extractive Distillation processes were studied to separate the ternary azeotropic mixture tetrahydrofuran/ethanol/water using a single component solvent (dimethyl sulfoxide) and a mixed solvent (dimethyl sulfoxide and ethylene glycol) as entrainer. The optimal conditions of all ternary Extractive Distillation processes were obtained based on the minimal total annual cost. Thermodynamic efficiency and CO2 emissions index were also considered to evaluate the energy efficiency and environmental impact of alternative ternary Extractive Distillation processes. The results show that the use of mixed entrainer can result in reduction in both energy consumption and total annual cost for the same ternary Extractive Distillation configuration. Comparisons of the conventional ternary Extractive Distillation process and thermally coupled ternary Extractive Distillation process 1 (combining Extractive Distillation column with entrainer-recovery column) with mixed entrainer show that a thermally coupled Extractive Distillation sequence with a side rectifier present the best results. However, thermally coupled ternary Extractive Distillation process 2 (combining Extractive Distillation column with entrainer-recovery column) does not show good result due to existence of remixing effect.
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Control of a Ternary Extractive Distillation Process with Recycle Splitting Using a Mixed Entrainer
Industrial & Engineering Chemistry Research, 2017Co-Authors: Xia Zhang, Zhaoyou Zhu, Yongteng Zhao, Huixin Wang, Bin Qin, Nan Zhang, Yinglong WangAbstract:Dynamic control of the ternary Extractive Distillation process is complex, due to the relatively high number of operating parameters and interactions between multiple azeotropes. In this research, the control structures of the ternary Extractive Distillation using dimethyl sulfoxide and a mixed solvent of dimethyl sulfoxide and ethylene glycol, as the entrainer, were explored for separating tetrahydrofuran/ethanol/water. A composition with a ratio of reboiler duty to mole feed flow rate control structure was proposed to obtain good dynamic responses for the ternary Extractive Distillation process with dimethyl sulfoxide and mixed entrainer. Moreover, control comparisons of the ternary Extractive Distillation with dimethyl sulfoxide and mixed entrainer demonstrated that the dynamic performances of the Extractive Distillation with mixed entrainer were better compared with the process using dimethyl sulfoxide. These studies contribute to the development of controllability for ternary Extractive Distillation ...
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Extractive Distillation for ethanol dehydration using imidazolium-based ionic liquids as solvents
Chemical Engineering and Processing: Process Intensification, 2016Co-Authors: Zhaoyou Zhu, Yongsaeng Ri, Hui Jia, Yongkun Wang, Min Li, Yinglong WangAbstract:An Extractive Distillation process was investigated, comparing the imidazolium-based ionic liquids [EMIM][BF4] and [BMIM][BF4] as solvents for ethanol dehydration. An Aspen Plus process simulator was used to simulate the feasibility of the ionic liquid-based Extractive Distillation (ILED) process and determine the main operating conditions of anhydrous ethanol production. User-defined ionic liquid components were created in Aspen Plus, with the required thermodynamic and physical property parameters. The NRTL model was used to calculate the thermodynamic properties. The proposed process and methodology using [EMIM][BF4] as the solvent was applied to evaluate the potential of Extractive Distillation for ethanol dehydration. The results show that the distillate purity of ethanol was higher than 99.9 mol% and revealed the advantage of decreased energy requirements compared with the Extractive Distillation process using conventional solvents. The ILED process design obtained from the sensitivity analysis for minimum energy consumption presented a lower total annual cost (TAC).
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effect of solvent flow rates on controllability of Extractive Distillation for separating binary azeotropic mixture
Industrial & Engineering Chemistry Research, 2015Co-Authors: Yinglong Wang, Shisheng Liang, Wei Liu, Zhen Zhang, Zhaoyou ZhuAbstract:The mixture of n-heptane and isobutanol creates a minimum-boiling azeotrope under atmospheric conditions. Extractive Distillation was used for separating n-heptane and isobutanol. A sequential iterative optimization procedure optimized the steady state Extractive Distillation process to obtain a minimal total annual cost (TAC). The dynamic control of the optimal Extractive Distillation process showed poor controllability. It was found that the dynamic control performance could be improved if the solvent flow rate was increased properly with a small increase in TAC. Hence, the choice of the optimal Extractive Distillation process for separating a binary azeotropic mixture should be considered from the perspectives of both TAC and the dynamic control performance.
Romildo Pereira Brito - One of the best experts on this subject based on the ideXlab platform.
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Rigorous thermodynamic evaluation of the Extractive Distillation process
Chemical Engineering Research and Design, 2018Co-Authors: Rivana Mabel Lucena Oliveira Souto, Karoline Dantas Brito, M. F. Figueirêdo, Gilvan Wanderley De Farias Neto, Fabricia Sales De Araújo, Wagner Brandão Ramos, Romildo Pereira BritoAbstract:Abstract The Extractive Distillation process has received special attention from researchers due to its high energy consumption and low thermodynamic efficiency. However, the thermodynamic performance has been approached in the literature in a superficial way and it is common to affirm that intensifying processes increases the thermodynamic efficiency without presenting quantitative results. The main objective of this work is to determine the operational conditions that result in maximum thermodynamic efficiency of the Extractive Distillation process (global optimum). Thus, the process was divided into three blocks in order to identify the irreversibility sources. The results show that the use of a solvent to enable the separation is the main cause of the low thermodynamic efficiency of the Extractive Distillation process, and depending on the chemical system and the operating condition, negative values for the Extractive column are observed. In order to make the thermodynamic analysis more didactic, a methodology to calculate the individual and overall lost work is proposed, which allows for identifying and quantifying, as well as where to act in order to increase the thermodynamic efficiency of the separation. The azeotropic binaries used as case studies consisted of ethanol (ETOH), water (H2O), acetone (ACET) and methanol (METOH), while the solvents used to promote separation were ethylene glycol (EG) and dimethyl sulfoxide (DMSO), respectively.
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Economic evaluation of energy saving alternatives in Extractive Distillation process
Computers & Chemical Engineering, 2016Co-Authors: Karoline Dantas Brito, Gardênia Marinho Cordeiro, M. F. Figueirêdo, Luís Gonzaga Sales Vasconcelos, Romildo Pereira BritoAbstract:Abstract Until now, there has not been consensus about the superiority of thermally coupled sequence over the conventional sequence in the Extractive Distillation process. In this sense, the main goal of this paper is to analyze three approaches for saving energy in the Extractive Distillation process: optimization, thermal integration and thermal coupling. Three azeotropic mixtures were investigated: ethanol and water (M1); tetrahydrofuran and water (M2); and acetone and methanol (M3). The solvents were ethylene glycol for M1 and M2, and water for M3. The results are shown in terms of the total annual cost (TAC) and specific energy consumption (SEC), and revealed that a thermally coupled Extractive Distillation sequence with a side rectifier did not always present the best results. Taking the case studies from literature as a starting point (without thermal integration), the optimization procedure used in this work found that TACs are always lower. The inclusion of thermal integration in configurations led to reducing TAC for all mixtures under investigation when compared to the sequences without this integration. When comparing two modifications in the layout of Extractive Distillation, it can be seen that it is more advantageous to use the preheating of the azeotropic feed with the recycle stream from the recovery column of the conventional sequence than using a thermally coupled sequence.
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Optimization of the Design and Operation of Extractive Distillation Processes
Separation Science and Technology, 2015Co-Authors: M. F. Figueirêdo, Karoline Dantas Brito, Luís Gonzaga Sales Vasconcelos, Wagner Brandão Ramos, Romildo Pereira BritoAbstract:The achievement of the optimal operating point of Extractive Distillation systems involves determining the values of the process variables, such as the solvent flowrate, the reflux ratio of the Extractive, and recovery columns. From the point of view of design, the optimum involves defining the number of stages of Extractive and recovery columns, as well as the feed stage positions of these columns. The above-mentioned columns are coupled through a recycle stream, which makes obtaining the optimal operating and design points a more complex task. This study arose from a new procedure for the analysis of Extractive Distillation columns, in which the solvent mole fraction in the solvent feed stage is the primary variable to be analyzed. The procedure allows for determining the values of the process and design variables that provide the global minimum for the total annual cost and the specific energy consumption of the Extractive Distillation processes (Extractive and recovery columns). Furthermore, it is pos...
Chen Biaohua - One of the best experts on this subject based on the ideXlab platform.
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Process Design for Separating C4 Mixtures by Extractive Distillation
2003Co-Authors: Chen BiaohuaAbstract:C4 components are useful in industry and should be separated as individuals. A new process was proposed to separate them by Extractive Distillation, with the advantages of low equipment investment, energy consumption and liquid load in the columns. One principle to improve the Extractive Distillation process was put forward. Moreover, the analysis of operation state of the new process was done. There were eight operation states found for the whole process, but only one operation state was desirable. This work provides a way to effectively separate C4 mixtures and helps the reasonable utilization of C4 resource.
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Separation of aqueous isopropanol by reactive Extractive Distillation
Journal of Chemical Technology & Biotechnology, 2002Co-Authors: Lei Zhigang, Zhang Jinchang, Chen BiaohuaAbstract:A new separation method of reactive Extractive Distillation is proposed for the separation of isopropanol and water, using the mixture of ethylene glycol (C2H6O2) and glycollic potassium (C2H5O2K) as an entrainer. Vapor–liquid-equilibrium (VLE) measurements confirmed that the entrainer was effective for this separation. Using a feed/solvent volume ratio of 1:1, isopropanol with a concentration over 96.0% weight fraction was obtained by the reactive Extractive Distillation process and the azeotropic point was eliminated. A novel process of separating isopropanol and water is designed on the basis of reactive Extractive Distillation to obtain the product with different concentrations, which may have a lasting value in industry. © 2002 Society of Chemical Industry
Changlin Shen - One of the best experts on this subject based on the ideXlab platform.
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design optimization of energy saving Extractive Distillation process by combining preconcentration column and Extractive Distillation column
Chemical Engineering Science, 2015Co-Authors: Yi An, Weisong Li, Shanyuan Huang, Changlin Shen, Ye Li, Chunjian XuAbstract:Abstract In Extractive Distillation, the addition of entrainer may reverse the relative volatility of the feed components causing the component with higher-boiling point to be removed as the distillate from the Extractive column. In this study, the energy saving possibility of a three-column Extractive Distillation system was studied when this phenomenon occurred. Based on a three-column conventional Extractive Distillation system, an innovative energy-saving Extractive Distillation process with lower capital investment was developed by combining preconcentration column and Extractive Distillation column. Two important case studies were investigated to verify the above-mentioned energy and economic advantages: the separation of n-propanol-water using N-methyl-2-pyrrolidone (NMP) as entrainer and the separation of ethyl acetate–ethanol using furfural as entrainer. In order to separate these two mixtures, first a three-column Extractive Distillation sequence including a preconcentration column was applied to diluted fresh feedstock. Then, based on this three-column conventional Extractive Distillation system, an innovative energy-saving Distillation process was developed. For the two separated mixtures, based on the method of global economic optimization, a scheme with optimum design variables was developed for both of the conventional Distillation and the new proposed Distillation processes. Results revealed that the new process offered 22.76% and 17.25% energy-savings respectively. Similar percentage of reduction in total annual costs (TAC) can also be obtained when compared to the conventional Distillation process.
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Design/optimization of energy-saving Extractive Distillation process by combining preconcentration column and Extractive Distillation column
Chemical Engineering Science, 2015Co-Authors: Shanyuan Huang, Changlin ShenAbstract:Abstract In Extractive Distillation, the addition of entrainer may reverse the relative volatility of the feed components causing the component with higher-boiling point to be removed as the distillate from the Extractive column. In this study, the energy saving possibility of a three-column Extractive Distillation system was studied when this phenomenon occurred. Based on a three-column conventional Extractive Distillation system, an innovative energy-saving Extractive Distillation process with lower capital investment was developed by combining preconcentration column and Extractive Distillation column. Two important case studies were investigated to verify the above-mentioned energy and economic advantages: the separation of n-propanol-water using N-methyl-2-pyrrolidone (NMP) as entrainer and the separation of ethyl acetate–ethanol using furfural as entrainer. In order to separate these two mixtures, first a three-column Extractive Distillation sequence including a preconcentration column was applied to diluted fresh feedstock. Then, based on this three-column conventional Extractive Distillation system, an innovative energy-saving Distillation process was developed. For the two separated mixtures, based on the method of global economic optimization, a scheme with optimum design variables was developed for both of the conventional Distillation and the new proposed Distillation processes. Results revealed that the new process offered 22.76% and 17.25% energy-savings respectively. Similar percentage of reduction in total annual costs (TAC) can also be obtained when compared to the conventional Distillation process.
