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Solubility of carbon dioxide in aqueous solutions of amino acid salts
A. F. Portugal; J. M. Sousa; F. D. Magalhães; A. MendesThe solubility of CO2 in aqueous solutions of potassium glycinate was measured in a stirred reactor, at temperatures from 293 to 351 K, for amino acid salt concentrations ranging between 0.1 and 3.0 mol dm(-3) and CO2 partial pressures up to 6 x 10(4) Pa. CO2 Solubility in potassium threonate 1.0 mol dm(-3) was also measured at 313 K. It was observed that amino acid salt solutions can be very interesting for CO...
Aging study of carbon molecular sieve membranes
S. Lagorsse; F. D. Magalhães; A. MendesFurther insight into the impact of air and humidity exposure on carbon molecular sieve membranes (CMSM) is provided. A CMSM was exposed to water vapor and to different dry environments (air, oxygen, nitrogen, propylene, etc.) for several months and the performance stability with time was analyzed periodically. In an effort to better understand the effect of oxygen on the fresh CMSM, regeneration at high tempera...
Contamination of Zeolites Used in Oxygen Production by PSA: Effects of Water an...
J. C. Santos; F. D. Magalhães; A. MendesPressure swing adsorption (PSA) is one of the technologies used for producing oxygen from air. Besides the cycles employed, the adsorbent used plays an important role. Many adsorbents are nowadays available showing different adsorption properties. The adsorbent contamination that may occur in a working PSA unit has a great impact on the performance of the separation; it is then important to know the behavior of...
Carbon dioxide absorption kinetics in potassium threonate
A. F. Portugal; F. D. Magalhães; A. MendesThe absorption of carbon dioxide in potassium threonate aqueous solutions is studied at concentrations ranging from 0.1 to 3 M and temperatures from 293 to 313 K. This study includes experimental density, viscosity, solubility of N2O and absorption kinetics of CO2 (using a stirred cell reactor) data obtained for the various potassium threonate solutions. The diffusion coefficients Of CO2 and potassium threonate...
Xenon recycling in an anaesthetic closed-system using carbon molecular sieve me...
S. Lagorsse; F. D. Magalhães; A. MendesThis work presents a new envisioned application of carbon molecular sieve membranes technology. It proposed the on-line recycling of xenon in anaesthetic closed re-breathing circuits. The cost and rarity of the so-called ideal anaesthetic gas xenon have impaired its widespread use in clinical practice. Reducing its waste through recycling will help xenon to find its place among anaesthetic substances. In collab...
Characterization of potassium glycinate for carbon dioxide absorption purposes
A. F. Portugal; P. W. J. Derks; G. F. Versteeg; F. D. Magalhães; A. MendesAqueous solutions of potassium glycinate were characterized for carbon dioxide absorption purposes. Density and viscosity of these solutions, with concentrations ranging from 0.1 to 3M, were determined at temperatures from 293 to 313 K. Diffusivity of CO2 in solution was estimated applying the modified Stokes–Einstein relation. Solubilities of N2O at the same temperatures and concentrations were measured ...
Solution of hyperbolic PDEs using a stable adaptive multiresolution method
P. Cruz; M. A. Alves; F. D. Magalhães; A. MendesAn efficient adaptive multiresolution numerical method is described for solving systems of partial differential equations. The grid is dynamically adapted during the integration procedure so that only the relevant information is stored. The convection terms are discretised with high resolution methods, thus ensuring boundedness. The proposed method is general, but is particularly useful for highly convective pr...
Solution of hyperbolic PDEs using a stable adaptive multiresolution method
P. Cruz; M. A. Alves; F. D. Magalhães; A. MendesAn e2cient adaptive multiresolution numerical method is described for solving systems of partial di3erential equations. The grid is dynamically adapted during the integration procedure so that only the relevant information is stored. The convection terms are discretised with high-resolution methods, thus ensuring boundedness. The proposed method is general, but is particularly useful for highly convective probl...
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