Results 91 to 100 of about 183 (127)
Representation of Piperazine-CO2-H2O System Using Extended-UNIQUAC and Computational Chemistry
Energy Procedia, 2013 AbstractPiperazine, an absorbent that has good potential for use as single amine or in mixtures with other amines, is studied in this work. Current measurement devices and methods are not able to measure the concentrations of all species that form during CO2 absorption into this amine and consequently calculation of equilibrium constants are not ...
Hamid Mehdizadeh +2 more
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Thermodynamic modelling of acid gas removal from natural gas using the Extended UNIQUAC model [PDF]
Fluid Phase Equilibria, 2017 Abstract Thermodynamics of natural gas sweetening process needs to be known for proper design of natural gas treating plants. Absorption with aqueous N-Methyldiethanolamine is currently the most commonly used process for removal of acid gas (CO2 and H2S) impurities from natural gas.
Negar Sadegh +2 more
exaly +2 more sources
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Fluid Phase Equilibria, 2009
Abstract The extended UNIQUAC model [K. Thomsen, P. Rasmussen, Chem. Eng. Sci. 54 (1999) 1787–1802] was applied to the thermodynamic representation of carbon dioxide absorption in aqueous monoethanolamine (MEA), methyldiethanolamine (MDEA) and varied strength mixtures of the two alkanolamines (MEA–MDEA).
Georgios M Kontogeorgis +2 more
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Abstract The extended UNIQUAC model [K. Thomsen, P. Rasmussen, Chem. Eng. Sci. 54 (1999) 1787–1802] was applied to the thermodynamic representation of carbon dioxide absorption in aqueous monoethanolamine (MEA), methyldiethanolamine (MDEA) and varied strength mixtures of the two alkanolamines (MEA–MDEA).
Georgios M Kontogeorgis +2 more
exaly +2 more sources
Fluid Phase Equilibria, 1991
Abstract The temperature effect on mutual solubility data for 81 binary systems has been studied by means of UNIQUAC and extended UNIQUAC models. The energy parameters of the models are expressed by a quadratic function of temperature. Among the systems studied 61 systems have an upper critical point, 14 systems have a closed partial miscibility and ...
Isamu Nagata +2 more
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Abstract The temperature effect on mutual solubility data for 81 binary systems has been studied by means of UNIQUAC and extended UNIQUAC models. The energy parameters of the models are expressed by a quadratic function of temperature. Among the systems studied 61 systems have an upper critical point, 14 systems have a closed partial miscibility and ...
Isamu Nagata +2 more
openaire +2 more sources
Process simulation of CO2 capture with aqueous ammonia using the Extended UNIQUAC model
International Journal of Greenhouse Gas Control, 2012Abstract The use of aqueous ammonia is a promising option to capture carbon dioxide from power plants thanks to the potential low heat requirement during the carbon dioxide desorption compared to monoethanolamine (MEA) based process. The patented Chilled Ammonia Process developed by Alstom absorbs carbon dioxide at low temperature (2–10 °C).
Bjørn Maribo-Mogensen +2 more
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A modified extended UNIQUAC model for proteins
Fluid Phase Equilibria, 2004A modification of the extended UNIQUAC model is proposed for the description of the non-ideality of protein solutions. Here, the Staverman–Guggenheim combinatorial contribution used in extended UNIQUAC model is replaced by the Flory–Huggins term to take into account the size differences between the protein and solvent.
João A.P. Coutinho +1 more
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Modeling of heavy metal salt solubility using the extended UNIQUAC model
AIChE Journal, 2002AbstractSolid–liquid equilibria in complex aqueous systems involving a heavy metal cation (Mn2+, Fe2+, Co2+, Ni2+, Cu2+, or Zn2+) and one or more ions for which Extended UNIQUAC parameters have been published previously are modeled using the Extended UNIQUAC model.
Maria C. Iliuta +2 more
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Representation of phase equilibria using a modified form of the extended uniquac model
Thermochimica Acta, 1995Abstract Binary infinite-dilution activity coefficients and LLE data for 14 systems (five aqueous systems, five alcohol + hydrocarbon systems, acetonitrile + n -hexane, and three nitroethane + hydrocarbon systems) are simultaneously correlated with a modification of the extended uniquac model, which also reproduces well binary and ternary VLE data
Isamu Nagata, Kaoru Tada
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Journal of Solution Chemistry, 2016
Certain alkyl ammonium salts are called ionic liquids They can be used as green solvents without toxicity, effects on the ozone layer depletion, effects on climate change, and any other significant environmental impacts; in this regard knowledge about their thermo-physical properties are really important.
Vahid Akbari +2 more
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Certain alkyl ammonium salts are called ionic liquids They can be used as green solvents without toxicity, effects on the ozone layer depletion, effects on climate change, and any other significant environmental impacts; in this regard knowledge about their thermo-physical properties are really important.
Vahid Akbari +2 more
exaly +2 more sources
Fluid Phase Equilibria, 2015
Abstract Aqueous MDEA is the most commonly used solvent for H 2 S removal from natural gas. A reliable thermodynamic model is required for the proper design of natural gas sweetening processes. In this study, a rigorous thermodynamic model is developed to represent properties of the H 2 S–MDEA–H 2 O ternary system.
Negar Sadegh +2 more
exaly +2 more sources
Abstract Aqueous MDEA is the most commonly used solvent for H 2 S removal from natural gas. A reliable thermodynamic model is required for the proper design of natural gas sweetening processes. In this study, a rigorous thermodynamic model is developed to represent properties of the H 2 S–MDEA–H 2 O ternary system.
Negar Sadegh +2 more
exaly +2 more sources