The Experts below are selected from a list of 58284 Experts worldwide ranked by ideXlab platform
Michel Cabassud - One of the best experts on this subject based on the ideXlab platform.
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ca oh 2 cao Reversible Reaction in a fluidized bed reactor for thermochemical heat storage
Solar Energy, 2014Co-Authors: Pierre Pardo, Zoe Anxionnazminvielle, Sylvie Rouge, Patrick Cognet, Michel CabassudAbstract:Thermal energy storage (TES) is a key factor for increasing the efficiency of concentrated solar power plants. TES using a Reversible chemical Reaction appears to be a promising technology for high energy density thermal storage (100–500 kW h m-3), at high temperature(up to 1000 °C) and during a long period (24 h to several months). This paper details an experimental study to carry out the Reversible Reaction Ca(OH)2(s) + DHr CaO(s) + H2O(g) in a fluidized bed (FB) reactor. The 4 micron Ca(OH)2 powder fluidization has been performed with an appropriate proportion of inert easy-to-fluidize particles. Then, Ca(OH)2 dehydration and CaO hydration have been implemented in a FB reactor and 50 cycles have been reached. The mean energy density obtained is 60 kW h m-3 solid_mixture which amounts to a promising energy density of 156 kW h m-3 Ca(OH)2-bulk if the reactants and the easy-to-fluidize particles are separated. The results demonstrated the feasibility of the implementation of the Ca(OH)2/CaO thermochemical heat storage in a fluidized bed reactor.
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Ca(OH)2/CaO Reversible Reaction in a fluidized bed reactor for thermochemical heat storage
Solar Energy, 2014Co-Authors: Pedro Pardo, Sylvie Rouge, Patrick Cognet, Zoé Anxionnaz-minvielle, Michel CabassudAbstract:Thermal energy storage (TES) is a key factor for increasing the efficiency of concentrated solar power plants. TES using a Reversible chemical Reaction appears to be a promising technology for high energy density thermal storage (100–500 kW h m-3), at high temperature(up to 1000 °C) and during a long period (24 h to several months). This paper details an experimental study to carry out the Reversible Reaction Ca(OH)2(s) + DHr CaO(s) + H2O(g) in a fluidized bed (FB) reactor. The 4 micron Ca(OH)2 powder fluidization has been performed with an appropriate proportion of inert easy-to-fluidize particles. Then, Ca(OH)2 dehydration and CaO hydration have been implemented in a FB reactor and 50 cycles have been reached. The mean energy density obtained is 60 kW h m-3 solid_mixture which amounts to a promising energy density of 156 kW h m-3 Ca(OH)2-bulk if the reactants and the easy-to-fluidize particles are separated. The results demonstrated the feasibility of the implementation of the Ca(OH)2/CaO thermochemical heat storage in a fluidized bed reactor.
Xin Gao - One of the best experts on this subject based on the ideXlab platform.
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Reversible Reaction assisted intensification process for separating ethanediol and 1 2 butanediol competitive kinetics study and conceptual design
Separation and Purification Technology, 2020Co-Authors: Rui Wang, Runnan Zhao, Yutao Yan, Xin GaoAbstract:Abstract Reversible Reaction-assisted technology for ethanediol (EG) and 1, 2-butanediol(1,2-BDO) azotropic mixture separation was proved effective. However, the missing acetalization kinetic parameters hinder the process design and industrialization. This paper addresses the competitive kinetics of EG and 1,2-BDO mixture towards propyl aldehyde. The Reaction mechanism was illustrated, and the impacts of feed composition, temperature and solution inhomogeneity were explored. The pseudo-homogeneous model was derived for the system, and the kinetic parameters were obtained. Results demonstrated that the aldehyde and 2-ethyl-1,3-dioxione (2ED) inputs were crucial manipulation variables for Reversible Reaction-assisted separating (RRAS) process design. The RRAS process was proposed, based on the competitive kinetics, to evaluate the techno-economic performance of RRAS. Two promising processes, which differed in the conversion of EG, were proposed to implement the separation. The economic evaluation revealed that the flowsheet with EG and 1,2-BDO both being converted to acetals and EG then being recovered through 2ED hydrolyzation, has more potential for industrial application.
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Reversible Reaction assisted intensification process for separating the azeotropic mixture of ethanediol and 1 2 butanediol reactants screening
Industrial & Engineering Chemistry Research, 2018Co-Authors: Rui Wang, Xin GaoAbstract:The feasibility of employing Reversible Reactions to convert the separation of ethanediol (EG) and 1,2-butanediol (1, 2-BDO) azeotropic system was analyzed in our previous work. This article aims at systematically screening the feasible reactants for the Reaction-assisted separation process. A screening principle was brought up and applied. Through preliminary screening, acetic acid, acrylic acid, acetaldehyde, propionaldehyde, propanol and butanone were obtained as potential reactants. Propionaldehyde was chosen as the proper one after fully comparing the Reaction selectivity difference and conversion of EG and 1,2-BDO in Reaction process, the separation efficiency in purification process as well as final EG yield. The separation efficiency was predicted based on the relative volatility of EG, 1,2-BDO and their corresponding products and was verified by distillation experiments. The stratification appeared in the Reaction was found beneficial to the coupling of Reaction and separation.
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Reversible Reaction-Assisted Intensification Process for Separating the Azeotropic Mixture of Ethanediol and 1,2-Butanediol: Reactants Screening
2017Co-Authors: Rui Wang, Xin GaoAbstract:The feasibility of employing Reversible Reactions to convert the separation of ethanediol (EG) and 1,2-butanediol (1,2-BDO) azeotropic system was analyzed in our previous work. This article aims at systematically screening the feasible reactants for the Reaction-assisted separation process. A screening principle was brought up and applied. Through preliminary screening, acetic acid, acrylic acid, acetaldehyde, propionaldehyde, propanol, and butanone were obtained as potential reactants. Propionaldehyde was chosen as the proper one after fully comparing the Reaction selectivity difference and conversion of EG and 1,2-BDO in the Reaction process, the separation efficiency in the purification process, and final EG yield. The separation efficiency was predicted based on the relative volatility of EG, 1,2-BDO, and their corresponding products and was verified by distillation experiments. The stratification appeared in the Reaction was found beneficial to the coupling of Reaction and separation
Rui Wang - One of the best experts on this subject based on the ideXlab platform.
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Reversible Reaction assisted intensification process for separating ethanediol and 1 2 butanediol competitive kinetics study and conceptual design
Separation and Purification Technology, 2020Co-Authors: Rui Wang, Runnan Zhao, Yutao Yan, Xin GaoAbstract:Abstract Reversible Reaction-assisted technology for ethanediol (EG) and 1, 2-butanediol(1,2-BDO) azotropic mixture separation was proved effective. However, the missing acetalization kinetic parameters hinder the process design and industrialization. This paper addresses the competitive kinetics of EG and 1,2-BDO mixture towards propyl aldehyde. The Reaction mechanism was illustrated, and the impacts of feed composition, temperature and solution inhomogeneity were explored. The pseudo-homogeneous model was derived for the system, and the kinetic parameters were obtained. Results demonstrated that the aldehyde and 2-ethyl-1,3-dioxione (2ED) inputs were crucial manipulation variables for Reversible Reaction-assisted separating (RRAS) process design. The RRAS process was proposed, based on the competitive kinetics, to evaluate the techno-economic performance of RRAS. Two promising processes, which differed in the conversion of EG, were proposed to implement the separation. The economic evaluation revealed that the flowsheet with EG and 1,2-BDO both being converted to acetals and EG then being recovered through 2ED hydrolyzation, has more potential for industrial application.
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Reversible Reaction assisted intensification process for separating the azeotropic mixture of ethanediol and 1 2 butanediol reactants screening
Industrial & Engineering Chemistry Research, 2018Co-Authors: Rui Wang, Xin GaoAbstract:The feasibility of employing Reversible Reactions to convert the separation of ethanediol (EG) and 1,2-butanediol (1, 2-BDO) azeotropic system was analyzed in our previous work. This article aims at systematically screening the feasible reactants for the Reaction-assisted separation process. A screening principle was brought up and applied. Through preliminary screening, acetic acid, acrylic acid, acetaldehyde, propionaldehyde, propanol and butanone were obtained as potential reactants. Propionaldehyde was chosen as the proper one after fully comparing the Reaction selectivity difference and conversion of EG and 1,2-BDO in Reaction process, the separation efficiency in purification process as well as final EG yield. The separation efficiency was predicted based on the relative volatility of EG, 1,2-BDO and their corresponding products and was verified by distillation experiments. The stratification appeared in the Reaction was found beneficial to the coupling of Reaction and separation.
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Reversible Reaction-Assisted Intensification Process for Separating the Azeotropic Mixture of Ethanediol and 1,2-Butanediol: Reactants Screening
2017Co-Authors: Rui Wang, Xin GaoAbstract:The feasibility of employing Reversible Reactions to convert the separation of ethanediol (EG) and 1,2-butanediol (1,2-BDO) azeotropic system was analyzed in our previous work. This article aims at systematically screening the feasible reactants for the Reaction-assisted separation process. A screening principle was brought up and applied. Through preliminary screening, acetic acid, acrylic acid, acetaldehyde, propionaldehyde, propanol, and butanone were obtained as potential reactants. Propionaldehyde was chosen as the proper one after fully comparing the Reaction selectivity difference and conversion of EG and 1,2-BDO in the Reaction process, the separation efficiency in the purification process, and final EG yield. The separation efficiency was predicted based on the relative volatility of EG, 1,2-BDO, and their corresponding products and was verified by distillation experiments. The stratification appeared in the Reaction was found beneficial to the coupling of Reaction and separation
Patrick Cognet - One of the best experts on this subject based on the ideXlab platform.
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ca oh 2 cao Reversible Reaction in a fluidized bed reactor for thermochemical heat storage
Solar Energy, 2014Co-Authors: Pierre Pardo, Zoe Anxionnazminvielle, Sylvie Rouge, Patrick Cognet, Michel CabassudAbstract:Thermal energy storage (TES) is a key factor for increasing the efficiency of concentrated solar power plants. TES using a Reversible chemical Reaction appears to be a promising technology for high energy density thermal storage (100–500 kW h m-3), at high temperature(up to 1000 °C) and during a long period (24 h to several months). This paper details an experimental study to carry out the Reversible Reaction Ca(OH)2(s) + DHr CaO(s) + H2O(g) in a fluidized bed (FB) reactor. The 4 micron Ca(OH)2 powder fluidization has been performed with an appropriate proportion of inert easy-to-fluidize particles. Then, Ca(OH)2 dehydration and CaO hydration have been implemented in a FB reactor and 50 cycles have been reached. The mean energy density obtained is 60 kW h m-3 solid_mixture which amounts to a promising energy density of 156 kW h m-3 Ca(OH)2-bulk if the reactants and the easy-to-fluidize particles are separated. The results demonstrated the feasibility of the implementation of the Ca(OH)2/CaO thermochemical heat storage in a fluidized bed reactor.
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Ca(OH)2/CaO Reversible Reaction in a fluidized bed reactor for thermochemical heat storage
Solar Energy, 2014Co-Authors: Pedro Pardo, Sylvie Rouge, Patrick Cognet, Zoé Anxionnaz-minvielle, Michel CabassudAbstract:Thermal energy storage (TES) is a key factor for increasing the efficiency of concentrated solar power plants. TES using a Reversible chemical Reaction appears to be a promising technology for high energy density thermal storage (100–500 kW h m-3), at high temperature(up to 1000 °C) and during a long period (24 h to several months). This paper details an experimental study to carry out the Reversible Reaction Ca(OH)2(s) + DHr CaO(s) + H2O(g) in a fluidized bed (FB) reactor. The 4 micron Ca(OH)2 powder fluidization has been performed with an appropriate proportion of inert easy-to-fluidize particles. Then, Ca(OH)2 dehydration and CaO hydration have been implemented in a FB reactor and 50 cycles have been reached. The mean energy density obtained is 60 kW h m-3 solid_mixture which amounts to a promising energy density of 156 kW h m-3 Ca(OH)2-bulk if the reactants and the easy-to-fluidize particles are separated. The results demonstrated the feasibility of the implementation of the Ca(OH)2/CaO thermochemical heat storage in a fluidized bed reactor.
Marcel Maeder - One of the best experts on this subject based on the ideXlab platform.
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kinetics of the Reversible Reaction of co2 aq and hco3 with sarcosine salt in aqueous solution
Journal of Physical Chemistry A, 2012Co-Authors: Qunyang Xiang, Mengxiang Fang, Hai Yu, Marcel MaederAbstract:Aqueous sarcosine salts are fast carbon dioxide (CO2) absorbents suitable for use in postcombustion CO2 capture in coal-fired power plants. We have developed a detailed Reaction scheme including all the Reactions in the sarcosine–CO2–water system. All unknown rate and equilibrium constants were obtained by global data fitting. We investigated the temperature-dependent rate and equilibrium constants of the Reaction between aqueous CO2 and sarcosine using stopped-flow spectrophotometry, by following the pH changes over the wavelength range 400–700 nm via coupling to pH indicators. The corresponding rate and equilibrium constants ranged from 15.0 to 45.0 °C and were analyzed in terms of Arrhenius, Eyring, and van’t Hoff relationships. The rate constant for the Reaction between CO2 and sarcosine to form the carbamate at 25.0 °C is 18.6(6) × 103 M–1 s–1, which is very high for an acyclic amine; its activation enthalpy is 59(1) kJ mol–1 and the entropy is 33(4) J mol–1 K–1. In addition, we investigated the slow...
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comprehensive kinetic and thermodynamic study of the Reactions of co2 aq and hco3 with monoethanolamine mea in aqueous solution
Journal of Physical Chemistry A, 2011Co-Authors: William Conway, Xiaoguang Wang, Debra Fernandes, Robert T Burns, Geoffrey A Lawrance, Graeme Puxty, Marcel MaederAbstract:The temperature dependence of the Reversible Reaction between CO2(aq) and monoethanolamine (MEA) has been investigated using stopped-flow spectrophotometry by following the pH changes during the Reactions with colored acid–base indicators. Multivariate global analysis of both the forward and backward kinetic measurements for the Reaction of CO2(aq) with MEA yielded the rate and equilibrium constants, including the protonation constant of MEA carbamate, for the temperature range of 15–45 °C. Analysis of the rate and equilibrium constants in terms of the Arrhenius, Eyring, and van’t Hoff relationships gave the relevant thermodynamic parameters. In addition, the rate and equilibrium constants for the slow, Reversible Reaction of bicarbonate with MEA are reported at 25.0 °C. At high pH, Reactions of the amine with CO2 and with bicarbonate are significant.
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kinetics of the Reversible Reaction of co2 aq with ammonia in aqueous solution
Journal of Physical Chemistry A, 2011Co-Authors: Xiaoguang Wang, William Conway, Debra Fernandes, Geoffrey A Lawrance, Graeme Puxty, Robert C Burns, Marcel MaederAbstract:The kinetics of the interactions of aqueous ammonia with aqueous carbon dioxide/carbonate species has been investigated using stopped-flow techniques by monitoring the pH changes via indicators. The Reactions include the Reversible formation of ammonium carbamate/carbamic acid. A complete Reaction mechanism has been established, and the temperature dependence of all rate and equilibrium constants including the protonation constant of the amine between 15 and 45 °C are reported and analyzed in terms of Arrhenius, Eyring, and van’t Hoff relationships.
