The Experts below are selected from a list of 6549 Experts worldwide ranked by ideXlab platform
Tsutomu Hirose - One of the best experts on this subject based on the ideXlab platform.
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Dual Reflux PSA Process Applied to VOC Recovery as Liquid Condensate
Adsorption-journal of The International Adsorption Society, 2005Co-Authors: Reiko Wakasugi, Motonobu Goto, Akio Kodama, Tsutomu HiroseAbstract:A new pressure swing adsorption process was proposed for treatment of low-VOC-concentration air streams. Feed gas is supplied to the high pressure column at some intermediate position to divide it into an enriching and a stripping sections. A part of air stream leaving the high pressure column is returned to the low pressure column as stripping reflux while air stream leaving the low pressure column is returned totally to the high pressure column as enriching reflux. With this dual reflux policy, VOC vapor can be enriched in the enriching section up to a concentration high enough to be condensed in liquid state as well as VOC free air is produced in the stripping section. High efficiency of the dual reflux PSA was confirmed experimentally in a lab-scale unit with a model system of ethanol-activated carbon for various parameters such as half cycle time, Feed rate, Feed Inlet position etc. The optimum Feed Inlet position was found experimentally and its behavior was interpreted based on an analytical simulation by short cycle time approximation.
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SEPARATION PERFORMANCE OF SUPERCRITICAL CARBON DIOXIDE EXTRACTION COLUMN FOR THE CITRUS OIL PROCESSING: OBSERVATION USING SIMULATOR
Separation Science and Technology, 2002Co-Authors: Mitsuru Kondo, Motonobu Goto, Akio Kodama, Tsutomu HiroseAbstract:Phase behavior of limonene and linalyl acetate, which are principal constituents of terpenes and oxygenated compounds, respectively, in bergamot oil, with supercritical carbon dioxide (SC-CO2) was observed by use of process simulator (SIMSCI PRO/II). Solubility of each pure component in SC-CO2 was calculated by the Peng–Robinson equation of state. For a given calculating condition, the solubility of limonene was 2–5 times higher than that of linalyl acetate. Process flow diagram for the citrus oil processing by SC-CO2 extraction column was successfully constructed to evaluate the separation performance. The effects of Feed composition, Feed Inlet position, reflux ratio, and stage number on the extraction ratio of limonene, separation selectivity, and recovery of linalyl acetate were studied at 333K and 8.8 MPa.
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Numerical analysis of a dual refluxed PSA process during simultaneous removal and concentration of carbon dioxide dilute gas from air
Journal of Chemical Technology & Biotechnology, 1999Co-Authors: Doudou Diagne, Motonobu Goto, Tsutomu HiroseAbstract:The simultaneous removal and concentration of carbon dioxide present in ambient air were carried out by a dual refluxed Pressure Swing Adsorption (PSA) process with intermediate Feed Inlet position. The Feed Inlet position divides each column into rectifying and stripping sections from which enriched and lean gases can be simultaneously produced. A simple isothermal model with negligible axial dispersion and pressure drops through the PSA beds was developed to investigate the effects of various combinations of the operating variables and to analyze semi-quantitatively the effects of the main characteristic parameters such as the dimensionless Feed Inlet position (Z R /L T ) and the stripping-reflux ratio (R T ). A good agreement between the model prediction and the experimental results was obtained. Moreover, an optimum Feed Inlet position was found and it corresponded to a position where the carbon dioxide mole ratio in the Feed flux and that in the upstream flux leaving the stripping section were equal. The carbon dioxide mole ratio in the enriched product (Y E ) as well as that in the lean product (Y L ) were strongly dependent on the ratio of Feed/enriched product flow rates (Q F /Q E ) and the ratio of Feed/lean product flow rates (Q F /Q L ). Although the pressure ratio (P a /P d ) was crucially important for the separation performance, a smaller value of R r was sufficient to reach a performance which is unattainable in conventional PSA processes.
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Parametric Studies on CO2 Separation and Recovery by a Dual Reflux PSA Process Consisting of Both Rectifying and Stripping Sections
Industrial & Engineering Chemistry Research, 1995Co-Authors: Doudou Diagne, Motonobu Goto, Tsutomu HiroseAbstract:Carbon dioxide separation and recovery from air-CO{sub 2} mixtures were carried out by means of a pressure swing adsorption process consisting of both rectifying and stripping sections. Zeolite MS 13X was used as the adsorbent and parametric studies such as effects of Feed Inlet position, reflux ratio, gas flow rates, and pressure ratio on the enriched product concentration or recovery as well as lean product concentration were experimentally investigated. The concept of optimal Feed Inlet position and reflux ratio was discussed from a viewpoint of concentration distributions along each adsorbent bed. It is also found that a reduction of the gas flow rates, which allows longer residence time inside the column, improves sensibly the separation performance.
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Experimental study of simultaneous removal and concentration of CO2 by an improved pressure swing adsorption process
Energy Conversion and Management, 1995Co-Authors: Doudou Diagne, Motonobu Goto, Tsutomu HiroseAbstract:CO2 removal and concentration from air - CO2 mixtures was carried out by means of a dual refluxed PSA process with intermediate Feed Inlet position. The effects of the process operating variables such as Feed position ZF/L, stripping reflux ratio Rr, and pressure ratio Pa/Pd were experimentally investigated. For an appropriate combination of them, the CO2 mole fraction was simultaneously concentrated and removed respectively at values higher than 94% and lower than 4% from Feed concentration ranging between 10–20%, a situation unattainable with conventional processes.
Li Gao - One of the best experts on this subject based on the ideXlab platform.
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de ammonification using direct contact membrane distillation an experimental and simulation study
Separation and Purification Technology, 2020Co-Authors: Li Gao, Guang Yang, Jianhua Zhang, Zongli XieAbstract:Abstract In this study, a mathematical model was developed to simulate the ammonia recovery behaviour in a Direct Contact Membrane Distillation (DCMD) system. The developed model successfully predicted the binary mass transfer phenomenon (water and ammonia vapour) across the PTFE membrane under different operating conditions, including non-traditional DCMD operating conditions that the permeate temperature is the same or higher than the Feed temperature. The developed model suggests that ammonia mass transfer increases as a function of Feed Inlet temperature, achieving 90% of the ammonia removal at 70 °C Feed Inlet temperature only requires less than half of the time at 20 °C Feed Inlet temperature. It was also found that pH value difference between the Feed and permeate sides plays the most significant role in ammonia recovery compared to other operating conditions. The developed model demonstrates that, for ammonia removal, it is not necessary to create (1) temperature difference between the Feed and permeate sides, or (2) higher Feed Inlet temperature compared to permeate Inlet temperature for DCMD system. This potentially makes the MD-based ammonia recovery system more economically viable as no external heat energy is required.
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De-ammonification using direct contact membrane distillation – An experimental and simulation study
Separation and Purification Technology, 2020Co-Authors: Li Gao, Guang Yang, Jianhua Zhang, Zongli XieAbstract:Abstract In this study, a mathematical model was developed to simulate the ammonia recovery behaviour in a Direct Contact Membrane Distillation (DCMD) system. The developed model successfully predicted the binary mass transfer phenomenon (water and ammonia vapour) across the PTFE membrane under different operating conditions, including non-traditional DCMD operating conditions that the permeate temperature is the same or higher than the Feed temperature. The developed model suggests that ammonia mass transfer increases as a function of Feed Inlet temperature, achieving 90% of the ammonia removal at 70 °C Feed Inlet temperature only requires less than half of the time at 20 °C Feed Inlet temperature. It was also found that pH value difference between the Feed and permeate sides plays the most significant role in ammonia recovery compared to other operating conditions. The developed model demonstrates that, for ammonia removal, it is not necessary to create (1) temperature difference between the Feed and permeate sides, or (2) higher Feed Inlet temperature compared to permeate Inlet temperature for DCMD system. This potentially makes the MD-based ammonia recovery system more economically viable as no external heat energy is required.
Zongli Xie - One of the best experts on this subject based on the ideXlab platform.
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de ammonification using direct contact membrane distillation an experimental and simulation study
Separation and Purification Technology, 2020Co-Authors: Li Gao, Guang Yang, Jianhua Zhang, Zongli XieAbstract:Abstract In this study, a mathematical model was developed to simulate the ammonia recovery behaviour in a Direct Contact Membrane Distillation (DCMD) system. The developed model successfully predicted the binary mass transfer phenomenon (water and ammonia vapour) across the PTFE membrane under different operating conditions, including non-traditional DCMD operating conditions that the permeate temperature is the same or higher than the Feed temperature. The developed model suggests that ammonia mass transfer increases as a function of Feed Inlet temperature, achieving 90% of the ammonia removal at 70 °C Feed Inlet temperature only requires less than half of the time at 20 °C Feed Inlet temperature. It was also found that pH value difference between the Feed and permeate sides plays the most significant role in ammonia recovery compared to other operating conditions. The developed model demonstrates that, for ammonia removal, it is not necessary to create (1) temperature difference between the Feed and permeate sides, or (2) higher Feed Inlet temperature compared to permeate Inlet temperature for DCMD system. This potentially makes the MD-based ammonia recovery system more economically viable as no external heat energy is required.
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De-ammonification using direct contact membrane distillation – An experimental and simulation study
Separation and Purification Technology, 2020Co-Authors: Li Gao, Guang Yang, Jianhua Zhang, Zongli XieAbstract:Abstract In this study, a mathematical model was developed to simulate the ammonia recovery behaviour in a Direct Contact Membrane Distillation (DCMD) system. The developed model successfully predicted the binary mass transfer phenomenon (water and ammonia vapour) across the PTFE membrane under different operating conditions, including non-traditional DCMD operating conditions that the permeate temperature is the same or higher than the Feed temperature. The developed model suggests that ammonia mass transfer increases as a function of Feed Inlet temperature, achieving 90% of the ammonia removal at 70 °C Feed Inlet temperature only requires less than half of the time at 20 °C Feed Inlet temperature. It was also found that pH value difference between the Feed and permeate sides plays the most significant role in ammonia recovery compared to other operating conditions. The developed model demonstrates that, for ammonia removal, it is not necessary to create (1) temperature difference between the Feed and permeate sides, or (2) higher Feed Inlet temperature compared to permeate Inlet temperature for DCMD system. This potentially makes the MD-based ammonia recovery system more economically viable as no external heat energy is required.
T. C. Rao - One of the best experts on this subject based on the ideXlab platform.
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Classification studies of lead–zinc ore fines using water-injection cyclone
International Journal of Mineral Processing, 2005Co-Authors: K. Udaya Bhaskar, B. Govindarajan, J. P. Barnwal, K. K. Rao, B. K. Gupta, T. C. RaoAbstract:Classification studies to recover liberated particles of lead and zinc minerals from a ground lead–zinc ore were carried out using a 100-mm water-injection cyclone. The effects of variables on the performance of water-injection cyclone are discussed. The results indicated that the injection water rate has a complex interaction with the other variables like spigot opening, Feed Inlet pressure, and vortex finder opening. A set of empirical equations for slurry throughput, corrected cyclone cut size, minimum distribution point, and reduced efficiency numbers was developed for predicting the performance of water-injection cyclone. Finally, the results obtained in water-injection cyclone are compared with the data obtained on a similar diameter (100 mm) hydrocyclone.
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Modelling Studies on a 100 mm Water-Injection Cyclone
Physical Separation in Science and Engineering, 2004Co-Authors: K. Udaya Bhaskar, B. Govindarajan, J. P. Barnwal, K. K. Rao, T. C. RaoAbstract:Test work on a 100 mm water-injection cyclone was carried out using a ground lead-zinc ore. Experiments were conducted varying the vortex finder diameter, spigot diameter, Feed Inlet pressure and injection water rate. The effect of variables on the performance of the water-injection cyclone in terms of slurry throughput and corrected cut-size are presented. A set of equations have been developed for predicting the performance of a water-injection cyclone. Further, the reduced efficiency curve was quantified to predict the size distribution of water-injection cyclone products.
Guang Yang - One of the best experts on this subject based on the ideXlab platform.
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de ammonification using direct contact membrane distillation an experimental and simulation study
Separation and Purification Technology, 2020Co-Authors: Li Gao, Guang Yang, Jianhua Zhang, Zongli XieAbstract:Abstract In this study, a mathematical model was developed to simulate the ammonia recovery behaviour in a Direct Contact Membrane Distillation (DCMD) system. The developed model successfully predicted the binary mass transfer phenomenon (water and ammonia vapour) across the PTFE membrane under different operating conditions, including non-traditional DCMD operating conditions that the permeate temperature is the same or higher than the Feed temperature. The developed model suggests that ammonia mass transfer increases as a function of Feed Inlet temperature, achieving 90% of the ammonia removal at 70 °C Feed Inlet temperature only requires less than half of the time at 20 °C Feed Inlet temperature. It was also found that pH value difference between the Feed and permeate sides plays the most significant role in ammonia recovery compared to other operating conditions. The developed model demonstrates that, for ammonia removal, it is not necessary to create (1) temperature difference between the Feed and permeate sides, or (2) higher Feed Inlet temperature compared to permeate Inlet temperature for DCMD system. This potentially makes the MD-based ammonia recovery system more economically viable as no external heat energy is required.
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De-ammonification using direct contact membrane distillation – An experimental and simulation study
Separation and Purification Technology, 2020Co-Authors: Li Gao, Guang Yang, Jianhua Zhang, Zongli XieAbstract:Abstract In this study, a mathematical model was developed to simulate the ammonia recovery behaviour in a Direct Contact Membrane Distillation (DCMD) system. The developed model successfully predicted the binary mass transfer phenomenon (water and ammonia vapour) across the PTFE membrane under different operating conditions, including non-traditional DCMD operating conditions that the permeate temperature is the same or higher than the Feed temperature. The developed model suggests that ammonia mass transfer increases as a function of Feed Inlet temperature, achieving 90% of the ammonia removal at 70 °C Feed Inlet temperature only requires less than half of the time at 20 °C Feed Inlet temperature. It was also found that pH value difference between the Feed and permeate sides plays the most significant role in ammonia recovery compared to other operating conditions. The developed model demonstrates that, for ammonia removal, it is not necessary to create (1) temperature difference between the Feed and permeate sides, or (2) higher Feed Inlet temperature compared to permeate Inlet temperature for DCMD system. This potentially makes the MD-based ammonia recovery system more economically viable as no external heat energy is required.