SummaryA fast physical method is used to measure oxygen solubilities in various solutions of sugars and salts, in nutrition media, and in fermentation broths of Penicillium chrysogenum. The findings were compared with the predictions of a solubility model which assumes that the solubility reduction is log-additive with respect to various compounds (mainly sugars and electrolytes). A striking agreement between experimental results and predictions was found.
The rates of absorption of carbon dioxide into water and into 0.5 mol/L equimolar carbonate buffer solutions (containing varying amounts of arsenite) were measured in a stirred cell with plane interface in the presence of fine solids (activated carbon, kieselguhr and alumina). Experiments show that the absorption rate increases significantly when the activated carbon loading increases up to about 0.2 g/L and thereafter remains constant. No significant effects were observed for other solids. The results could be explained in terms of a "shuttle" mechanism where particles adsorb gas near the interface which is then followed by desorption (or reactions) in the bulk. At very high loadings (above 10 vol. %), the absorption rate decreased for all particles and this could be explained by the blockage of the interface and/or by the sharp increase in the suspension viscosity.
~~Les vitesses d'absorption du bioxyde de carbone dans I'eau et dans des solutions tampon de carbonate Cquimolaires de 0,5 mol/L (contenant difftrentes quantitts d'arsenite) ont CtC mesurtes dans une cellule agitCe avec une interface plane en prCsence de particules solides fines (carbone activC, kieselguhr et alumine). Les exptriences montrent que la vitesse d'absorption augmente de maniere significative lorsque le chargement en carbone activt augmente jusquh environ 0,2 glL, mais reste stable par la suite. Aucun effet significatif n'a CtC relevt pour les autres solides. Les resultats peuvent &re expliquts sous I'angle d'un mtcanisme de "navette" par lequel les particules adsorbent le gaz pres de l'i?terface, suivi d'une desorption (ou rkactions) dans le chargement.A des charges tres ClevCes (au-dessus de 10% en volume), la vitesse d'absorption diminue pour toutes les particules, ce qui peut s'expliquer par le blocage de I'interface ou I'augmentation tres nette de la viscosite des suspensions.
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