Behavior of gas bubbles in aqueous electrolyte solutions

Effect of ionic strength on bubble coalescence in inorganic salt and seawater solutions

“…Furthermore, correlations have been found between solution ionic strength and either bubble size or gas holdup. 6,[16][17][18] Ionic strength cannot be taken as a universal rule, however, as certain salts (e.g., NaClO 4 , KI, and KNO 3 ) show extremely weak coalescence inhibition 4,14 and do not follow the ionic strength rule. In addition, Craig et al 7 observed that certain electrolytes have no effect on bubble coalescence, even at very high concentrations ($0.5 M), and rules based on the nature of the cationic/anionic pair were established to predict this behavior.…”

Gas-Liquid Mass Transfer in an Unbaffled Vessel Agitated by Unsteadily Forward-Reverse Rotating Multiple Impellers

“…As a result, favorably comparable k L a L values were obtained in the unbaffled vessel agitated by the forward-reverse rotating impellers. Presence of electrolytes in liquid phase is known to decrease the rate for gas bubbles to coalesce (Marrucci and Nicodemo, 1967;Zieminski and Whittemore, 1971) and to decrease the size of gas bubbles dispersed in liquid phase (Linek et al, 1970;Robinson and Wilke, 1973;Robinson and Wilke, 1974;Van't Riet, 1979;Hassan and Robinson, 1980;Linek et al, 1987). Decreased size of gas bubbles in liquid phase containing electrolyte causes increase of the gas-liquid interfacial area, a L , which is further enhanced by the tendency for the gas hold-up to increase with decrease of the bubble size.…”

“…Liquid phases treated in most chemical processes are mixtures of various substances. Presence of inorganic electrolytes is known to decrease the rate for gas bubbles to coalesce because of the electrical effect at the gas-liquid interface (Marrucci and Nicodemo, 1967;Zieminski and Whittemore, 1971). In many cases, the electrical effect creates different gasliquid dispersion characteristics, such as decreased size of gas bubbles dispersed in liquid phase without practical changes in their density, viscosity and surface tension (Linek et al, 1970;Robinson and Wilke, 1973;Robinson and Wilke, 1974;Van't Riet, 1979;Hassan and Robinson, 1980;Linek et al, 1987).…”

Effect of dissolved metal sulphates on gas-liquid oxygen transfer in agitated quartz and pyrite slurries

“…A clear relation between coalescence rate and ionic strength I [mol/1] of an aqueous system has been established (Craig et al, 1993;Keitel et al, 1981;Zieminski et al, 1971). As a general rule of thumb, 3-2 electrolytes (e.g.…”

“…• Mineral density • Oxygen consumption due to homogeneous reactions (Beek et al, 1991) • Ionic strength of the slurry (Craig et al, 1993;Zieminski et al, 1971) …”