ABSTRACT The absorption of carbon dioxide in various aqueous alkanolamine solutions have been stu... more ABSTRACT The absorption of carbon dioxide in various aqueous alkanolamine solutions have been studied with and without carbonic anhydrase respectively in a stirred cell reactor at 298 K. The examined alkanolamines were: N,N-diethylethanolamine (DEMEA), N,N-dimethylethanolamine (DMMEA), monoethanolamine (MEA), triethanolamine (TEA) and tri-isopropanolamine (TIPA). This work confirms that the CO2 hydration is catalysed by the enzyme in presence of alkanolamines. The differences in reaction rate between the tested alkanolamines are attributed to the enzyme regeneration step in the mechanism – that is, an acid base reaction. A Langmuir–Hinshelwood-like equation has been postulated to describe the observed overall rate constant of the enzymatic reaction as a function of the enzyme concentration. The two kinetic constants in the postulated equation both depend exponentially on the pKa value of the alkanolamine present in the solution.
High-temperature catalytic processs performed using inorganic membranes have been in recent years... more High-temperature catalytic processs performed using inorganic membranes have been in recent years a fast growing area of research, which seems to have not yet reached its peak. Chemical engineers, catalysts and materials scientists have addressed this topic from different viewpoint in a common effort. Despite the amount of work already carried out, the direct application of inorganic membrane reactors in
Journal of Membrane Science - J MEMBRANE SCI, 1993
In the present study the application of a liquid membrane for selective removal of H2S from gases... more In the present study the application of a liquid membrane for selective removal of H2S from gases also containing CO2 was investigated. The liquid membrane was filled with pure methyl-di-ethanol-amine (MDEA). A theoretical model was developed to describe: (a) the chemical equilibrium between the dissolved gas and MDEA in the membrane and (b) the physical equilibrium between the solute (CO2 and H2S) in the gas and the liquid phase. Experimentally H2S and CO2 fluxes were determined in a setup consisting of two well mixed gas phase compartments separated by a flat liquid membrane. The fluxes were interpreted with the theoretical model and separately measured physical constants (solubility, diffusivity and the porosity/tortuosity factor of the membrane material). No reaction of CO2 with MDEA was observed which is attributed to the absence of water. A weak acid/base interaction of H2S and MDEA was found to increase the H2S transport through the membrane which includes higher selectivity....
ABSTRACT The absorption of carbon dioxide in various aqueous alkanolamine solutions have been stu... more ABSTRACT The absorption of carbon dioxide in various aqueous alkanolamine solutions have been studied with and without carbonic anhydrase respectively in a stirred cell reactor at 298 K. The examined alkanolamines were: N,N-diethylethanolamine (DEMEA), N,N-dimethylethanolamine (DMMEA), monoethanolamine (MEA), triethanolamine (TEA) and tri-isopropanolamine (TIPA). This work confirms that the CO2 hydration is catalysed by the enzyme in presence of alkanolamines. The differences in reaction rate between the tested alkanolamines are attributed to the enzyme regeneration step in the mechanism – that is, an acid base reaction. A Langmuir–Hinshelwood-like equation has been postulated to describe the observed overall rate constant of the enzymatic reaction as a function of the enzyme concentration. The two kinetic constants in the postulated equation both depend exponentially on the pKa value of the alkanolamine present in the solution.
High-temperature catalytic processs performed using inorganic membranes have been in recent years... more High-temperature catalytic processs performed using inorganic membranes have been in recent years a fast growing area of research, which seems to have not yet reached its peak. Chemical engineers, catalysts and materials scientists have addressed this topic from different viewpoint in a common effort. Despite the amount of work already carried out, the direct application of inorganic membrane reactors in
Journal of Membrane Science - J MEMBRANE SCI, 1993
In the present study the application of a liquid membrane for selective removal of H2S from gases... more In the present study the application of a liquid membrane for selective removal of H2S from gases also containing CO2 was investigated. The liquid membrane was filled with pure methyl-di-ethanol-amine (MDEA). A theoretical model was developed to describe: (a) the chemical equilibrium between the dissolved gas and MDEA in the membrane and (b) the physical equilibrium between the solute (CO2 and H2S) in the gas and the liquid phase. Experimentally H2S and CO2 fluxes were determined in a setup consisting of two well mixed gas phase compartments separated by a flat liquid membrane. The fluxes were interpreted with the theoretical model and separately measured physical constants (solubility, diffusivity and the porosity/tortuosity factor of the membrane material). No reaction of CO2 with MDEA was observed which is attributed to the absence of water. A weak acid/base interaction of H2S and MDEA was found to increase the H2S transport through the membrane which includes higher selectivity....
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Papers by Geert Versteeg