The Experts below are selected from a list of 13956 Experts worldwide ranked by ideXlab platform
Maria C Iliuta - One of the best experts on this subject based on the ideXlab platform.
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co2 removal by single and mixed amines in a hollow fiber membrane module investigation of contactor performance
Aiche Journal, 2015Co-Authors: Ion Iliuta, Francis Bougie, Maria C IliutaAbstract:This work investigates CO2 removal by single and blended amines in a hollow-fiber membrane contactor (HFMC) under gas-filled and partially Liquid-filled membrane pores conditions via a two-scale, nonisothermal, steady-state model accounting for CO2 diffusion in gas-filled pores, CO2 and amines diffusion/reaction within Liquid-filled pores and CO2 and amines diffusion/reaction in Liquid Boundary Layer. Model predictions were compared with CO2 absorption data under various experimental conditions. The model was used to analyze the effects of Liquid and gas velocity, CO2 partial pressure, single (primary, secondary, tertiary, and sterically hindered alkanolamines) and mixed amines solution type, membrane wetting, and cocurrent/countercurrent flow orientation on the HFMC performance. An insignificant difference between the absorption in cocurrent and countercurrent flow was observed in this study. The membrane wetting decreases significantly the performance of hollow-fiber membrane module. The nonisothermal simulations reveal that the hollow-fiber membrane module operation can be considered as nearly isothermal. © 2014 American Institute of Chemical Engineers AIChE J, 61: 955–971, 2015
Liyuan Deng - One of the best experts on this subject based on the ideXlab platform.
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CO2 capture using highly viscous amine blends in non-porous membrane contactors
Chemical Engineering Journal, 2019Co-Authors: Luca Ansaloni, Hanna K Knuutila, Ardi Hartono, Muhammad Awais, Liyuan DengAbstract:Abstract New amine blends have shown a promising potential to reduce the energy penalty for CO2 capture in post combustion, making the deployment of carbon capture technologies one-step closer. However, their application at the industrial scale is threaten by their high volatility. Non-porous membrane contactors offer a viable solution to properly control amine emissions from these absorbents. In the present work, the CO2 capture performance of non-porous membrane contactors using new amine blends as Liquid phase was investigated in a temperature range typical for the absorption step (25–60 °C). Different amine blends with promising features in terms of cycling capacity and regeneration energy requirement were selected as Liquid absorbents. Thin composite membranes fabricated by coating a perfluoropolymer on the top of a porous polypropylene Layer were used as the interface between the gas and the Liquid. At room temperature, membrane contactors using new absorbents exhibit a lower CO2 mass transfer coefficient compared to the benchmark (30 wt% MEA), possibly due to the high viscosity of these Liquids. The modelling analysis suggests that the Liquid Boundary Layer dominates the mass transfer resistance in the temperature range up to 40 °C, but at higher temperatures, the decrease of the solvent viscosity makes the mass transfer dominated by the membrane phase. Interestingly, the new amine blends show better performance compared to the benchmark at higher CO2 concentrations in feed gas, highlighting a good potential to capture CO2 from concentrated flue gas from steel/cement industry or to upgrade biogas.
Ion Iliuta - One of the best experts on this subject based on the ideXlab platform.
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co2 removal by single and mixed amines in a hollow fiber membrane module investigation of contactor performance
Aiche Journal, 2015Co-Authors: Ion Iliuta, Francis Bougie, Maria C IliutaAbstract:This work investigates CO2 removal by single and blended amines in a hollow-fiber membrane contactor (HFMC) under gas-filled and partially Liquid-filled membrane pores conditions via a two-scale, nonisothermal, steady-state model accounting for CO2 diffusion in gas-filled pores, CO2 and amines diffusion/reaction within Liquid-filled pores and CO2 and amines diffusion/reaction in Liquid Boundary Layer. Model predictions were compared with CO2 absorption data under various experimental conditions. The model was used to analyze the effects of Liquid and gas velocity, CO2 partial pressure, single (primary, secondary, tertiary, and sterically hindered alkanolamines) and mixed amines solution type, membrane wetting, and cocurrent/countercurrent flow orientation on the HFMC performance. An insignificant difference between the absorption in cocurrent and countercurrent flow was observed in this study. The membrane wetting decreases significantly the performance of hollow-fiber membrane module. The nonisothermal simulations reveal that the hollow-fiber membrane module operation can be considered as nearly isothermal. © 2014 American Institute of Chemical Engineers AIChE J, 61: 955–971, 2015
A G Fane - One of the best experts on this subject based on the ideXlab platform.
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composite hollow fiber membranes with different poly dimethylsiloxane intrusions into substrate for phenol removal via extractive membrane bioreactor
Journal of Membrane Science, 2016Co-Authors: Chun Heng Loh, Yuan Zhang, Shuwen Goh, Rui Wang, A G FaneAbstract:Abstract Due to its toxicity to ecosystem, phenol removal from industrial wastewater before discharge is a priority concern. Extractive membrane bioreactor (EMBR), a novel wastewater treatment process combining aqueous–aqueous extractive membrane process and biodegradation, has shown potential in treating phenol in wastewater. In this paper, composite hollow fiber membranes with different levels of poly(dimethylsiloxane) (PDMS) intrusion were prepared by coating a Layer of PDMS on a Polyetherimide (PEI) hollow fiber substrate. Their applicability to EMBR for phenol removal was studied. The prepared membranes were characterized by microscopy and gas permeation test, and their performances were evaluated in aqueous–aqueous extractive membrane processes and EMBR process. The overall mass transfer coefficient for phenol, or k 0 , was found to be significantly affected by the level of PDMS intrusion in the composite membranes. This is because the penetration of PDMS into the porous substrate results in a denser membrane structure, which consequently increases the membrane resistance. A slight penetration of PDMS into the substrate was found to be necessary for the composite membranes to achieve high k 0 while maintaining low inorganic flux across the membranes. Wilson-plot analysis suggests that membrane resistance dominated over Liquid Boundary Layer resistances. After more than 250 h of EMBR operation, significant biofilm growth was observed on the composite membranes and the k 0 was dropped but stabilized at around 7.5×10 −7 m/s. This k 0 was 7.5 times higher than commercial PDMS tubular membranes (without biofilm development) reported in previous studies, confirming the superiority of thin film composite membranes prepared in this work. It was also found that process optimization to control biofilm thickness is important in order to enhance phenol removal rate in EMBR.
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performance enhancement and scaling control with gas bubbling in direct contact membrane distillation
Desalination, 2013Co-Authors: Guizi Chen, Xing Yang, Rong Wang, A G FaneAbstract:This study incorporates gas bubbling into direct contact membrane distillation (DCMD) and examines its effect on the MD performance especially at elevated salt concentrations in the feed steam. Process optimization in the bubbling assisted DCMD process was carried out which involved varying operating conditions and module configurations. Also, observations were performed for the scaling status on the membrane surface with operating time in different modules to further understand the role of gas bubbling in affecting the behavior of crystal deposition when the salt concentration has reached super-saturation. Due to intensified local mixing and physical flow disturbance in the Liquid Boundary Layer on the feed side, a higher flux enhancement could be achieved in a bubbling system with either a higher feed operating temperature, lower feed and permeate flow velocities, inclined module orientation, shorter fiber length or lower packing density. It was also found that gas bubbling not only enhanced the permeation flux by average 26% when concentrating feed solution from 18% salt concentration to saturation, but also delayed the occurrence of major flux decline due to crystal deposition when compared to the module with spacers. These results were confirmed by membrane surface autopsy at different operating stages using SEM.
Luca Ansaloni - One of the best experts on this subject based on the ideXlab platform.
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CO2 capture using highly viscous amine blends in non-porous membrane contactors
Chemical Engineering Journal, 2019Co-Authors: Luca Ansaloni, Hanna K Knuutila, Ardi Hartono, Muhammad Awais, Liyuan DengAbstract:Abstract New amine blends have shown a promising potential to reduce the energy penalty for CO2 capture in post combustion, making the deployment of carbon capture technologies one-step closer. However, their application at the industrial scale is threaten by their high volatility. Non-porous membrane contactors offer a viable solution to properly control amine emissions from these absorbents. In the present work, the CO2 capture performance of non-porous membrane contactors using new amine blends as Liquid phase was investigated in a temperature range typical for the absorption step (25–60 °C). Different amine blends with promising features in terms of cycling capacity and regeneration energy requirement were selected as Liquid absorbents. Thin composite membranes fabricated by coating a perfluoropolymer on the top of a porous polypropylene Layer were used as the interface between the gas and the Liquid. At room temperature, membrane contactors using new absorbents exhibit a lower CO2 mass transfer coefficient compared to the benchmark (30 wt% MEA), possibly due to the high viscosity of these Liquids. The modelling analysis suggests that the Liquid Boundary Layer dominates the mass transfer resistance in the temperature range up to 40 °C, but at higher temperatures, the decrease of the solvent viscosity makes the mass transfer dominated by the membrane phase. Interestingly, the new amine blends show better performance compared to the benchmark at higher CO2 concentrations in feed gas, highlighting a good potential to capture CO2 from concentrated flue gas from steel/cement industry or to upgrade biogas.