The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform
Andrzej Gorak - One of the best experts on this subject based on the ideXlab platform.
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experimental model validation for n propyl propionate synthesis in a reactive distillation column coupled with a liquid liquid Phase Separator
Chemical Engineering Science, 2011Co-Authors: Tobias Keller, Jan Muendges, A Jantharasuk, C A Gonzalezrugerio, H Moritz, Peter Kreis, Andrzej GorakAbstract:Abstract In the synthesis of some organic esters, reactive distillation coupled with a liquid–liquid Phase Separator is often used to increase the product purity or to recover the reactants. In this article, we present a comprehensive experimental and theoretical study on the heterogeneously catalysed synthesis of n -propyl propionate by reactive distillation and a subsequent liquid–liquid Phase Separator. The experiments were performed in a pilot-scale reactive distillation column. Data-reconciliation tests proved that the experimental results obtained comprise a complete, reliable set of composition and temperature profiles along the pilot-scale reactive distillation column and can be used for further model validation. A nonequilibrium-stage model was applied to predict the experimental results. Simulation studies demonstrated that the composition and temperature profiles in the rectifying section of the column were highly sensitive to the composition of the reflux stream entering the column. Deviations between the experimental and predicted composition profiles in the rectifying section were identified. An explanation for the deviations is given in this article.
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Experimental model validation for n-propyl propionate synthesis in a reactive distillation column coupled with a liquid–liquid Phase Separator
Chemical Engineering Science, 2011Co-Authors: Tobias Keller, Jan Muendges, A Jantharasuk, H Moritz, Peter Kreis, C.a. González-rugerio, Andrzej GorakAbstract:Abstract In the synthesis of some organic esters, reactive distillation coupled with a liquid–liquid Phase Separator is often used to increase the product purity or to recover the reactants. In this article, we present a comprehensive experimental and theoretical study on the heterogeneously catalysed synthesis of n -propyl propionate by reactive distillation and a subsequent liquid–liquid Phase Separator. The experiments were performed in a pilot-scale reactive distillation column. Data-reconciliation tests proved that the experimental results obtained comprise a complete, reliable set of composition and temperature profiles along the pilot-scale reactive distillation column and can be used for further model validation. A nonequilibrium-stage model was applied to predict the experimental results. Simulation studies demonstrated that the composition and temperature profiles in the rectifying section of the column were highly sensitive to the composition of the reflux stream entering the column. Deviations between the experimental and predicted composition profiles in the rectifying section were identified. An explanation for the deviations is given in this article.
A Jantharasuk - One of the best experts on this subject based on the ideXlab platform.
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experimental model validation for n propyl propionate synthesis in a reactive distillation column coupled with a liquid liquid Phase Separator
Chemical Engineering Science, 2011Co-Authors: Tobias Keller, Jan Muendges, A Jantharasuk, C A Gonzalezrugerio, H Moritz, Peter Kreis, Andrzej GorakAbstract:Abstract In the synthesis of some organic esters, reactive distillation coupled with a liquid–liquid Phase Separator is often used to increase the product purity or to recover the reactants. In this article, we present a comprehensive experimental and theoretical study on the heterogeneously catalysed synthesis of n -propyl propionate by reactive distillation and a subsequent liquid–liquid Phase Separator. The experiments were performed in a pilot-scale reactive distillation column. Data-reconciliation tests proved that the experimental results obtained comprise a complete, reliable set of composition and temperature profiles along the pilot-scale reactive distillation column and can be used for further model validation. A nonequilibrium-stage model was applied to predict the experimental results. Simulation studies demonstrated that the composition and temperature profiles in the rectifying section of the column were highly sensitive to the composition of the reflux stream entering the column. Deviations between the experimental and predicted composition profiles in the rectifying section were identified. An explanation for the deviations is given in this article.
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Experimental model validation for n-propyl propionate synthesis in a reactive distillation column coupled with a liquid–liquid Phase Separator
Chemical Engineering Science, 2011Co-Authors: Tobias Keller, Jan Muendges, A Jantharasuk, H Moritz, Peter Kreis, C.a. González-rugerio, Andrzej GorakAbstract:Abstract In the synthesis of some organic esters, reactive distillation coupled with a liquid–liquid Phase Separator is often used to increase the product purity or to recover the reactants. In this article, we present a comprehensive experimental and theoretical study on the heterogeneously catalysed synthesis of n -propyl propionate by reactive distillation and a subsequent liquid–liquid Phase Separator. The experiments were performed in a pilot-scale reactive distillation column. Data-reconciliation tests proved that the experimental results obtained comprise a complete, reliable set of composition and temperature profiles along the pilot-scale reactive distillation column and can be used for further model validation. A nonequilibrium-stage model was applied to predict the experimental results. Simulation studies demonstrated that the composition and temperature profiles in the rectifying section of the column were highly sensitive to the composition of the reflux stream entering the column. Deviations between the experimental and predicted composition profiles in the rectifying section were identified. An explanation for the deviations is given in this article.
Georges L. Chahine - One of the best experts on this subject based on the ideXlab platform.
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development of a passive Phase Separator for space and earth applications
Separation and Purification Technology, 2017Co-Authors: Xiongjun Wu, Greg Loraine, Chao-tsung Hsiao, Georges L. ChahineAbstract:Abstract The limited amount of liquids and gases that can be carried to space makes it imperative to recycle and reuse these fluids for extended human operations. During recycling processes gas and liquid Phases are often intermixed. In the absence of gravity, separating gases from liquids is challenging due to the absence of buoyancy. This paper describes development of a passive Phase Separator that is capable of efficiently and reliably separating gas–liquid mixtures of both high and low void fractions in a wide range of flow rates that is applicable to for both space and earth applications.
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Development of an Efficient Phase Separator for Space and Ground Applications
Volume 2 Fora: Advances in Fluids Engineering Education; Cavitation and Multiphase Flow; Fluid Measurements and Instrumentation, 2016Co-Authors: Xiongjun Wu, Greg Loraine, Chao-tsung Hsiao, Georges L. ChahineAbstract:The limited amount of liquids and gases that can be carried to space makes it imperative to recycle and reuse these fluids for extended human operations. During recycling processes gas and liquid Phases are often intermixed. In the absence of gravity, separating gases from liquids is challenging due to the absence of buoyancy. This paper discusses a Phase Separator that is capable of efficiently and reliably separating gas-liquid mixtures of both high and low void fractions in a wide range of flow rates that is applicable to reduced and zero gravity environments. The Phase Separator consists of two concentric cylindrical chambers. The fluid introduced in the space between the two cylinders enters the inner cylinder through tangential slots and generates a high intensity swirling flow. The geometric configuration is selected to make the vortex swirl intense enough to lead to early cavitation which forms a cylindrical vaporous core at the axis even at low flow rates. Taking advantage of swirl and cavitation, the Phase Separator can force gas out of the liquid into the central core of the vortex even at low void fraction. Gas is extracted from one end of the cylinder axial region and liquid is extracted from the other end. The Phase Separator has successfully demonstrated its capability to reduce mixture void fractions down to 10−8 and to accommodate incoming mixture gas volume fractions as high as 35% in both earth and reduced gravity flight tests. The Phase Separator is on track to be tested by NASA on the International Space Station (ISS). Additionally, the Phase Separator design exhibits excellent scalability. Phase Separators of different dimensions, with inlet liquid flow rates that range from a couple of GPMs to a few tens of GPMs, have been built and tested successfully in the presence and absence of the gravity. Extensive ground experiments have been conducted to study the effects of main design parameters on the performance of the Phase Separator, such as the length and diameter of the inner cylinder; the size, location, and layout of injection slots and exit orifices, etc., on the swirling flow behavior, and on the gas extraction performance. In parallel, numerical simulations, utilizing a two-Phase Navier-Stokes flow solver coupled with bubble dynamics, have been conducted extensively to facilitate the development of the Phase Separator. These simulations have enabled us to better understand the physics behind the Phase separation and provided guideline for system parts optimization. This paper describes our efforts in developing the passive Phase Separator for both space and ground applications.
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Development of a DYNASWIRL ® Phase Separator for Space Applications
50th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition, 2012Co-Authors: Xiongjun Wu, Georges L. ChahineAbstract:®Phase Separator is able to force even very low void fraction gas out of the liquid into the central core of the vortex, and the extract it from the core. A prototype that was tested on a NASA reduced gravity flight in August 2009 successfully reduced the void fraction down to 10 -8 . Data analysis and flow visualization indicated that a steady vortex core was maintained and that the gas was continuously removed from the vortex core under the reduced-gravity conditions. Development of the Phase Separator was guided by 3D Numerical simulations using 3DYNAFS © , which couples an incompressible Navier-Stokes flow solver and a bubble tracking and dynamics code.
Tobias Keller - One of the best experts on this subject based on the ideXlab platform.
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experimental model validation for n propyl propionate synthesis in a reactive distillation column coupled with a liquid liquid Phase Separator
Chemical Engineering Science, 2011Co-Authors: Tobias Keller, Jan Muendges, A Jantharasuk, C A Gonzalezrugerio, H Moritz, Peter Kreis, Andrzej GorakAbstract:Abstract In the synthesis of some organic esters, reactive distillation coupled with a liquid–liquid Phase Separator is often used to increase the product purity or to recover the reactants. In this article, we present a comprehensive experimental and theoretical study on the heterogeneously catalysed synthesis of n -propyl propionate by reactive distillation and a subsequent liquid–liquid Phase Separator. The experiments were performed in a pilot-scale reactive distillation column. Data-reconciliation tests proved that the experimental results obtained comprise a complete, reliable set of composition and temperature profiles along the pilot-scale reactive distillation column and can be used for further model validation. A nonequilibrium-stage model was applied to predict the experimental results. Simulation studies demonstrated that the composition and temperature profiles in the rectifying section of the column were highly sensitive to the composition of the reflux stream entering the column. Deviations between the experimental and predicted composition profiles in the rectifying section were identified. An explanation for the deviations is given in this article.
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Experimental model validation for n-propyl propionate synthesis in a reactive distillation column coupled with a liquid–liquid Phase Separator
Chemical Engineering Science, 2011Co-Authors: Tobias Keller, Jan Muendges, A Jantharasuk, H Moritz, Peter Kreis, C.a. González-rugerio, Andrzej GorakAbstract:Abstract In the synthesis of some organic esters, reactive distillation coupled with a liquid–liquid Phase Separator is often used to increase the product purity or to recover the reactants. In this article, we present a comprehensive experimental and theoretical study on the heterogeneously catalysed synthesis of n -propyl propionate by reactive distillation and a subsequent liquid–liquid Phase Separator. The experiments were performed in a pilot-scale reactive distillation column. Data-reconciliation tests proved that the experimental results obtained comprise a complete, reliable set of composition and temperature profiles along the pilot-scale reactive distillation column and can be used for further model validation. A nonequilibrium-stage model was applied to predict the experimental results. Simulation studies demonstrated that the composition and temperature profiles in the rectifying section of the column were highly sensitive to the composition of the reflux stream entering the column. Deviations between the experimental and predicted composition profiles in the rectifying section were identified. An explanation for the deviations is given in this article.
S W K Yuan - One of the best experts on this subject based on the ideXlab platform.
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Vapors-liquid Phase Separator
2013Co-Authors: S W K Yuan, T. H. K. Frederking, C. Chuang, G. S. Brown, Y. KamiokaAbstract:The use of porous plugs, mostly with in the form of passive devices with constant area were considered as vapor-liquid Phase Separators for helium 2 storage vessels under reduced gravity. The incorporation of components with variable cross sectional area as a method of flow rate modification was also investigated. A particular device which uses a shutter-type system for area variation was designed and constructed. This system successfully permitted flor rate changes of up to plus or minus 60% from its mean value.
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the dependence of choked flow and breakthrough on pore size distribution in vapor liquid Phase separation of he ii using porous media
Advances in cryogenic engineering, 1996Co-Authors: S W K Yuan, D.j. Frank, Chris R LagesAbstract:Liquid breakthrough and choked flow are important phenomena in the operation of Phase Separators in space. Breakthrough results in loss of liquid which can reduce the life time of, and potentially terminate a mission. Choked flow limits the amount of liquid boiloff which passes through the Phase Separator and can result in the warming of the bath temperature. Since the capillary effect plays an important role in both the above phenomena, the distribution of pore sizes in the Phase Separator governs the critical limits of breakthrough and choked flow. In this paper, the pore size dependence of breakthrough and choked flow in vapor-liquid Phase Separators will be discussed in detail. The experimental data of various Phase Separators tested for the Relativity Mission will also be compared to present theory.