Search results for "Phase equilibrium"
showing 4 items of 4 documents
Ein iteratives numerisches verfahren zur auswertung von elutionsanalysen an eng verteilten polymeren
1972
Ein iteratives Rechenverfahren zur Bestimmung der Molekulargewichtsverteilungsfunktionen aus experimentellen, mit der isothermen Elution ermittelten Daten – speziell fur Polymere kleiner Uneinheitlichkeit – wird beschrieben. Hierbei wird die klassisch gewonnene Verteilung als Naherung betrachtet, rechnerisch auf der Basis des Phasengleichgewichts erneut fraktioniert und aus den ermittelten Fraktionen die Zusatzinformation zur Konstruktion einer besseren Naherung gewonnen. Um die Stabilitat der Konvergenz des Verfahrens zu zeigen, wurde eine Simulationsrechnung durchgefuhrt. Schlieslich wird das Verfahren an experimentell gewonnenen Daten eines aus zwei gut bekannten, eng verteilten Polystyr…
AN EXPERIMENTAL APPARATUS TO CHARACTERIZE PHASE SEPARATION IN POLYMER SOLUTIONS
2013
A Novel Gas Chromatographic Method to Measure Sorption of Dense Gases into Polymers
2006
A novel experimental approach to determine the solubility of gaseous compounds inside polymers is here described. The method is based on the gas chromatographic determination of the composition of the fluid phase at equilibrium with the polymer. To take into account the effect of the volume swelling on the measurement a suitable probe, nonabsorbable by the polymer, was added to the fluid phase. Under the adopted configuration the apparatus can operate up to 35 MPa and 80°C. This experimental technique has been used to determine the solubility of carbon dioxide in poly(vinylidene fluoride) using argon as a probe. The latter was chosen because it is negligibly absorbed by the polymer and does…
Experimental and estimated saturated vapour pressures of aroma compounds
1999
Abstract The saturated vapour pressure of d-linalool, 2-nonanone, d-limonene and isoamyl acetate were measured using a static method at different temperatures from 223 to 468 K. From the experimental values, Antoine's constants were determined to enable the calculations of the saturated vapour pressures at a given temperature. The saturated vapour pressure of the four aroma compounds at 298 K were respectively 27, 59, 200 and 733 Pa. These results were compared with those obtained using different estimation methods (Antoine–Grain, Watson, Lee–Kesler, Gomez–Thodos, Grain and Mackay). Gomez–Thodos' model was found to be the most accurate method for the estimation of the saturated vapour press…