The Experts below are selected from a list of 76845 Experts worldwide ranked by ideXlab platform
Zhen Zhang - One of the best experts on this subject based on the ideXlab platform.
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control of extractive distillation and partially heat integrated pressure swing distillation for separating azeotropic mixture of ethanol and tetrahydrofuran
Industrial & Engineering Chemistry Research, 2015Co-Authors: Yinglong Wang, Zhen Zhang, Yujun Zhao, Shisheng LiangAbstract:Dynamic controls of an extractive distillation (ED) process and a partially heat-integrated pressure-swing distillation (PHIPSD) process for separating a mixture of 50 mol % ethanol and 50 mol % tetrahydrofuran are investigated. Comparisons between the control structures of the two distillation processes are made. The results show that PHIPSD has advantages of economic savings and control compared with the ED process. In addition, some control structures of PHIPSD for Feed streams with different Composition and some comparisons between the performances of the control structures are also studied. It is concluded that the Feed Composition mainly impacts the dynamic control structures of PHIPSD through the different combinations of auxiliary heat exchanger and that a Composition controller can improve the control performances.
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heat integrated pressure swing distillation process for separation of tetrahydrofuran methanol with different Feed Compositions
Industrial & Engineering Chemistry Research, 2014Co-Authors: Yinglong Wang, Zhen ZhangAbstract:A process optimization is carried out to separate binary azeotropic mixtures of tetrahydrofuran and methanol by pressure-swing distillation according to the pressure-sensitive property of the binary system. Rigorous steady-state simulation that is based on the minimization of the total annual cost for partially and fully heat-integrated pressure-swing-distillation processes is implemented on Aspen Plus following the sequential iterative optimization procedure. The feasible sequence of high pressure and low pressure of two columns in the pressure-swing-distillation process and the suitable heat integration scheme are both determined by the Feed Composition.
Yinglong Wang - One of the best experts on this subject based on the ideXlab platform.
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control of extractive distillation and partially heat integrated pressure swing distillation for separating azeotropic mixture of ethanol and tetrahydrofuran
Industrial & Engineering Chemistry Research, 2015Co-Authors: Yinglong Wang, Zhen Zhang, Yujun Zhao, Shisheng LiangAbstract:Dynamic controls of an extractive distillation (ED) process and a partially heat-integrated pressure-swing distillation (PHIPSD) process for separating a mixture of 50 mol % ethanol and 50 mol % tetrahydrofuran are investigated. Comparisons between the control structures of the two distillation processes are made. The results show that PHIPSD has advantages of economic savings and control compared with the ED process. In addition, some control structures of PHIPSD for Feed streams with different Composition and some comparisons between the performances of the control structures are also studied. It is concluded that the Feed Composition mainly impacts the dynamic control structures of PHIPSD through the different combinations of auxiliary heat exchanger and that a Composition controller can improve the control performances.
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heat integrated pressure swing distillation process for separation of tetrahydrofuran methanol with different Feed Compositions
Industrial & Engineering Chemistry Research, 2014Co-Authors: Yinglong Wang, Zhen ZhangAbstract:A process optimization is carried out to separate binary azeotropic mixtures of tetrahydrofuran and methanol by pressure-swing distillation according to the pressure-sensitive property of the binary system. Rigorous steady-state simulation that is based on the minimization of the total annual cost for partially and fully heat-integrated pressure-swing-distillation processes is implemented on Aspen Plus following the sequential iterative optimization procedure. The feasible sequence of high pressure and low pressure of two columns in the pressure-swing-distillation process and the suitable heat integration scheme are both determined by the Feed Composition.
William L Luyben - One of the best experts on this subject based on the ideXlab platform.
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control of a heat integrated pressure swing distillation process for the separation of a maximum boiling azeotrope
Industrial & Engineering Chemistry Research, 2014Co-Authors: William L LuybenAbstract:Methanol and trimethoxysilane form a maximum-boiling homogeneous azeotrope whose Composition changes fairly significantly with pressure, so separation into high-purity products is viable using pressure-swing distillation. Heat integration of the two columns can be used to reduce energy costs since they operate at different temperatures. The pressure in the high-pressure column is not controlled but “floats” depending on conditions in the base of the low-pressure column. An auxiliary reboiler is required to balance the heat duty in the low-pressure column. Since pressure affects the Composition of the azeotropic, this variable pressure increases the complexity of the required control structure. The purpose of this paper is to develop a control scheme that can effectively handle large disturbances in Feed flow rate and Feed Composition.
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evaluation of criteria for selecting temperature control trays in distillation columns
Journal of Process Control, 2006Co-Authors: William L LuybenAbstract:Abstract The use of tray temperatures to infer Compositions is widespread in distillation control. A number of criteria have been proposed for selecting which trays to hold at constant temperature. The most commonly used are (1) choosing a tray where there are large changes in temperature from tray to tray (“slope” of the temperature profile), (2) finding the tray where there is the largest change in temperature for a change in the manipulated variable (“sensitivity”), (3) using singular value deComposition (SVD) analysis, (4) selecting the tray where the temperature does not change as Feed Composition changes while producing the desired distillate and bottoms purities and (5) choosing the tray that produces the smallest changes in product purities when it is held constant in the face of Feed Composition disturbances. This paper provides a quantitative comparison of the effectiveness of these five alternative criteria. Several systems are considered, ranging from ideal binary to azeotropic multi-component. Results show that SVD analysis provides a simple and effective method for selecting temperature control tray location.
Shisheng Liang - One of the best experts on this subject based on the ideXlab platform.
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control of extractive distillation and partially heat integrated pressure swing distillation for separating azeotropic mixture of ethanol and tetrahydrofuran
Industrial & Engineering Chemistry Research, 2015Co-Authors: Yinglong Wang, Zhen Zhang, Yujun Zhao, Shisheng LiangAbstract:Dynamic controls of an extractive distillation (ED) process and a partially heat-integrated pressure-swing distillation (PHIPSD) process for separating a mixture of 50 mol % ethanol and 50 mol % tetrahydrofuran are investigated. Comparisons between the control structures of the two distillation processes are made. The results show that PHIPSD has advantages of economic savings and control compared with the ED process. In addition, some control structures of PHIPSD for Feed streams with different Composition and some comparisons between the performances of the control structures are also studied. It is concluded that the Feed Composition mainly impacts the dynamic control structures of PHIPSD through the different combinations of auxiliary heat exchanger and that a Composition controller can improve the control performances.
Aiwu Zeng - One of the best experts on this subject based on the ideXlab platform.
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Heat-integrated pressure-swing distillation process for separating the minimum-boiling azeotrope ethyl-acetate and ethanol
Separation and Purification Technology, 2017Co-Authors: Qingjun Zhang, Meiling Liu, Aiwu ZengAbstract:Abstract Design and control of the forward integration of pressure-swing distillation processes is explored with the aid of the tools of Aspen plus and Aspen dynamics taking the separation of the minimum-boiling azeotrope ethyl acetate and ethanol as an example. The optimized separation configuration is obtained by taking the minimization of total annual cost (TAC) as an objective function. The two key performance indicators of second law efficiency (η) and carbon dioxide emissions are employed to evaluate the three operations, which consist of conventional non-heat integration and the corresponding partially and fully heat integration processes. Compared to the non-heat integration process, the fully heat integration process is more attractive since it can achieve 33.33% energy consumption saving, reduction of 31.33% CO 2 emissions and 26.64% TAC. Furthermore, the control of the PSD processes with heat integration are explored since the interaction of parameters are complicated for this neat configuration. The effectiveness of the single-end control strategy is evaluated and determined by method of the Feed Composition sensitive analysis, and a series of control structures are devised and assessed by the perturbations of the Feed flow rate and Feed Composition. It is concluded that the small disturbances are addressed for fully heat integration in comparison with the partially heat integration owing to the degree of freedom reduction. In addition, the efficient control strategy with the ratio scheme to manipulate the cascade flow controller is developed to eliminate the snowball effect for PSD with partially case.