The Experts below are selected from a list of 79164 Experts worldwide ranked by ideXlab platform
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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comparison of pressure swing Distillation and extractive Distillation with varied diameter column in economics and dynamic control
Journal of Process Control, 2017Co-Authors: Jiajing Hu, Guangle Bu, Yinglong WangAbstract:Abstract Pressure-swing Distillation and extractive Distillation are two common methods for azeotrope separation. The economics and controllability are two crucial factors for evaluating the feasibility of a separation process. A varied-diameter column (VDC) was used in the process design to evaluate its economics and controllability. Five azeotropic systems were investigated in order to compare the economics of pressure-swing Distillation and extractive Distillation with a VDC. Results indicate that pressure-swing Distillation with a VDC saves more money than extractive Distillation. The dynamic control were evaluated in the acetone-methanol system for both processes with a VDC. The improved control structure for pressure-swing Distillation with a VDC can handle ±20% disturbances effectively, while the improved control structure for extractive Distillation with a VDC can only handle ±10% disturbances. A comparison of the two methods from the viewpoint of economics and controllability demonstrates that pressure-swing Distillation is more suitable when using a VDC.
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insight into pressure swing Distillation from azeotropic phenomenon to dynamic control
Chemical Engineering Research & Design, 2017Co-Authors: Shisheng Liang, Xin Li, Yongteng Zhao, Yongkun Wang, Yinglong WangAbstract:Abstract Pressure-swing Distillation (PSD) is widely used as an efficient method for separating pressure-sensitive azeotropic mixtures in industrial processes. Remarkably, PSD can achieve pure products without introducing a third component compared with extractive Distillation and azeotropic Distillation. Heat integration into PSD can save energy and reduce operating costs, thus relieving the continuous growth of energy consumption in the Distillation industry. This review paper describes the development of this widely used Distillation technique, including all of the main aspects related to thermodynamic analysis, Quantitative structure property relationship (QSPR), process design, process intensification, and dynamic control. Based on the foundation of research, further development of PSD is proposed for separating multi-component azeotropic mixtures and exploring the process design and dynamic control from QSPR, aiming at promoting the industrial application of this environmentally friendly and well-known separation technique from multi-scale analysis.
I Yang - One of the best experts on this subject based on the ideXlab platform.
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new vacuum Distillation technology for separating and recovering valuable metals from a high value added waste
Separation and Purification Technology, 2019Co-Authors: Guozheng Zha, Wenlong Jiang, Chongfang Yang, Yunke Wang, Xinyu Guo, I YangAbstract:Abstract Flotation tailings of copper-anode slime is a high value-added waste. A new, clean and highly efficient vacuum Distillation process is presented for the separation of valuable metals that remain in the waste. In this work, the saturated vapor pressure of each metal element in the flotation tailings is theoretically analyzed, with vapor-liquid equilibria (VLE) diagrams used to quantitatively predict the composition of the products. The optimum Distillation temperature and time of volatilization behavior of each component are investigated using a two-step, low-temperature and high-temperature vacuum Distillation experiment; the system pressure of both steps is 1–5 Pa. The experimental results indicate that the recovery efficiencies of Se and Te are 98.09% and 97.82%, respectively, after the low-temperature Distillation (923 K and 120 min); the removal rates of Pb, Sb and Bi are 92.99%, 96.86% and 94.57%, respectively. The recovery efficiencies of Cu, Ag and Au are 95.65%, 99.28% and 99.12%, respectively, after the high-temperature Distillation (1173 K and 50 min). Valuable metals in the flotation tailings can be separated and recovered effectively via a two-step vacuum Distillation in which no wastewater or gas is released into the environment, meeting the development needs for cleaner production within the metallurgical industry.
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experimental investigation and calculation of vapor liquid equilibria for cu pb binary alloy in vacuum Distillation
Fluid Phase Equilibria, 2015Co-Authors: Cheng Zhang, Wenlong Jiang, Dachu Liu, I Yang, Hongwei YangAbstract:Abstract In this study, vacuum Distillation experiments of high-lead crude copper were performed under the vapor pressure 5 Pa. The content of lead in crude copper was reduced from 15% to less than 0.01% in a single stage Distillation process with residual vapor pressures of below 10 Pa, Distillation temperatures of 1423 K and Distillation times of 60 min. The vapor–liquid equilibrium (VLE) phase diagrams of Cu–Pb binary alloy in vacuum Distillation were calculated using the Wilson equation. Thermodynamic experimental data taken from literature were used for calculating Wilson equation temperature dependent interaction parameters. The calculations give a satisfactory accuracy with the experimental data for separation of Cu–Pb alloy in vacuum Distillation. The results indicate that VLE phase diagrams under vacuum obtained by this method are reliable for predicting the process of vacuum Distillation for Cu–Pb alloy. The VLE phase diagrams of alloys will have significant benefits for the industrial production of vacuum metallurgy especially for the process of multistage Distillation in the vacuum furnace.
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thermodynamics of removing impurities from crude lead by vacuum Distillation refining
Transactions of Nonferrous Metals Society of China, 2014Co-Authors: Xiangfeng Kong, Heng Xiong, Lingxi Kong, Dachu Liu, I Yang, X U AoqiangAbstract:Abstract A novel technique was developed to remove impurities from crude lead by vacuum Distillation. The thermodynamics on vacuum Distillation refining process of crude lead was studied by means of saturated vapor pressure of main components of crude lead, separation coefficients and vapor-liquid equilibrium composition of Pb-i (i stands for an impurity) system at different temperatures. The behaviors of impurities in the vacuum Distillation refining process were investigated. The results show that the vacuum Distillation should be taken to obtain lead from crude lead, in which Zn, As and partial Sb are volatilized at lower temperature of 923-1023 K. Lead is distilled from the residue containing Cu, Sn, Ag and Bi at higher temperature of 1323-1423 K, but the impurity Bi is also volatilized along with lead and cannot be separated from lead.
Nidal Hilal - One of the best experts on this subject based on the ideXlab platform.
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an integrated fertilizer driven forward osmosis renewables powered membrane Distillation system for brackish water desalination a combined experimental and theoretical approach
Desalination, 2019Co-Authors: Wafa Suwaileh, Daniel Johnson, Nidal Hilal, Daniel R. JonesAbstract:Abstract Utilization of an integrated forward osmosis-solar powered membrane Distillation system can provide a promising method for brackish water desalination. In this study, the brackish water feed and fertilizer draw solutions were operated in a forward osmosis process to generate irrigation water for agriculture. Forward osmosis was also selected as membrane Distillation pre-treatment to avoid fouling and wetting of the membrane Distillation membrane. Subsequently, the diluted draw solutions were treated in the membrane Distillation system to recover the initial osmotic pressure and to obtain a final distillate permeate. The experimental results revealed that the modified forward osmosis membrane exhibited slightly better performance in terms of maximum water flux, minimum reverse solute flux and high water recovery of 53.5%. In the membrane Distillation process, an optimum water flux of about 5.7 L/m2. hr and high rejection rate of about 99.55% were achieved at an optimum temperature of 60 °C. Modelling was applied to investigate the feasibility of using a solar collector to power the membrane Distillation system and hence limit energy costs. By using renewable energy, we calculate that the energy consumption of the hybrid system could be reduced by 67%. Membrane Distillation-solar powered system can achieve optimum energy consumption recoded as 1.1 kWh. We concluded that the diluted fertilizer draw solution can be used as an irrigation water after further dilution by an available water source. By using forward osmosis prior to membrane Distillation process, the membrane Distillation membrane showed less fouling and wetting leading to excellent rejection rate and acceptable distillate permeate. The energy consumption of the forward osmosis-solar powered membrane Distillation system was lower than that for reverse osmosis stand-alone system. The findings of this work could be used to develop guidelines for the optimal design of industrial forward osmosis-membrane Distillation system.
P Senthilkuma - One of the best experts on this subject based on the ideXlab platform.
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active solar Distillation a detailed review
Renewable & Sustainable Energy Reviews, 2010Co-Authors: K Sampathkuma, T V Arjuna, P Pitchandi, P SenthilkumaAbstract:All over the world, access to potable water to the people are narrowing down day by day. Most of the human diseases are due to polluted or non-purified water resources. Even today, under developed countries and developing countries face a huge water scarcity because of unplanned mechanism and pollution created by manmade activities. Water purification without affecting the ecosystem is the need of the hour. In this context, many conventional and non-conventional techniques have been developed for purification of saline water. Among these, solar Distillation proves to be both economical and eco-friendly technique particularly in rural areas. Many active Distillation systems have been developed to overcome the problem of lower distillate output in passive solar stills. This article provides a detailed review of different studies on active solar Distillation system over the years. Thermal modelling was done for various types of active single slope solar Distillation system. This review would also throw light on the scope for further research and recommendations in active solar Distillation system.
Anton A. Kiss - One of the best experts on this subject based on the ideXlab platform.
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innovative single step bioethanol dehydration in an extractive dividing wall column
Separation and Purification Technology, 2012Co-Authors: Anton A. Kiss, Radu M IgnatAbstract:Abstract The large-scale production of bioethanol fuel requires energy demanding Distillation steps to concentrate the diluted streams from the fermentation step and to overcome the azeotropic behavior of the ethanol–water mixture. The conventional separation sequence consists of three Distillation columns performing several tasks with high energy penalties: pre-concentration of ethanol, extractive Distillation and solvent recovery. Despite the novel recent developments in pervaporation and adsorption with molecular sieves, the industrial production of anhydrous bioethanol is still dominated by extractive Distillation as the separation method of choice. This study proposes an innovative Distillation setup – based on a novel extractive dividing-wall column (E-DWC) – that is able to concentrate and dehydrate bioethanol in a single step, by integrating all units of the conventional sequence into only one Distillation column. In this work, a mixture of 10 wt% ethanol (100 ktpy plant) is concentrated and dehydrated using ethylene glycol as mass separating agent. Rigorous simulations were carried out in Aspen Plus, and for a fair comparison all alternatives were optimized using the reliable sequential quadratic programming (SQP) method. The results show that energy savings of 17%, and a similar decrease in CapEx, are possible for the novel E-DWC alternative, while using a significantly reduced footprint as compared to the conventional separation process.
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enhanced bioethanol dehydration by extractive and azeotropic Distillation in dividing wall columns
Separation and Purification Technology, 2012Co-Authors: Anton A. Kiss, David J P C SuszwalakAbstract:Abstract The industrial production of anhydrous bioethanol requires energy demanding Distillation steps to overcome the azeotropic behavior of the ethanol–water mixture. In spite of the recent developments in pervaporation and adsorption with molecular sieves, the large scale production is still dominated by extractive and azeotropic Distillation as the separation technology of choice. This study proposes novel Distillation technologies for enhanced bioethanol dehydration, by extending the use of dividing-wall columns (DWC) to energy efficient extractive Distillation (ED) and azeotropic Distillation (AD). Notably, DWC is one of the best examples of proven process intensification technology in Distillation, as it allows significantly lower investment and operating costs while also reducing the equipment and carbon footprint. For both ED and AD cases a classic sequence of two Distillation columns and the alternative based on DWC are optimized using the state of the art sequential quadratic programming (SQP) method. A mixture of 85 mol.% ethanol is dehydrated using ethylene glycol and n -pentane as mass separating agents in an extractive and azeotropic Distillation setup, respectively. The results of the rigorous simulations performed in Aspen Plus show that energy savings of 10–20% are possible for the novel process intensification alternatives based on DWC, while using less equipment units as compared to the conventional ED and AD configurations.
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enhanced bioethanol dehydration by extractive and azeotropic Distillation in dividing wall columns
Separation and Purification Technology, 2012Co-Authors: Anton A. Kiss, David J P C SuszwalakAbstract:Abstract The industrial production of anhydrous bioethanol requires energy demanding Distillation steps to overcome the azeotropic behavior of the ethanol–water mixture. In spite of the recent developments in pervaporation and adsorption with molecular sieves, the large scale production is still dominated by extractive and azeotropic Distillation as the separation technology of choice. This study proposes novel Distillation technologies for enhanced bioethanol dehydration, by extending the use of dividing-wall columns (DWC) to energy efficient extractive Distillation (ED) and azeotropic Distillation (AD). Notably, DWC is one of the best examples of proven process intensification technology in Distillation, as it allows significantly lower investment and operating costs while also reducing the equipment and carbon footprint. For both ED and AD cases a classic sequence of two Distillation columns and the alternative based on DWC are optimized using the state of the art sequential quadratic programming (SQP) method. A mixture of 85 mol.% ethanol is dehydrated using ethylene glycol and n -pentane as mass separating agents in an extractive and azeotropic Distillation setup, respectively. The results of the rigorous simulations performed in Aspen Plus show that energy savings of 10–20% are possible for the novel process intensification alternatives based on DWC, while using less equipment units as compared to the conventional ED and AD configurations.
