Abstract
AbstractBreak‐through curves for the exchange of Na+ ions in 0·1 n‐NaCl in glycerol‐water mixtures for H+ ions in a fixed bed of Dowex‐50‐resin have been determined for Reynolds numbers from 0·01 to 2. Solutions containing up to 75% by vol. of glycerol and having viscosities up to 30 centipoise at 25° were used. Some measurements were also made on 0·1 n‐NaCl in ‘Polycell’ solutions in water. Small concentrations of this substance increase the viscosity of the system considerably with little effect on the ionic diffusivity. Effluent compositions and ionic diffusivities were determined by electrical conductivity. The total resistances to mass‐transfer were calculated from the slopes of the break‐through curves and values of the liquid film resistance estimated by the method of Gilliland & Baddour.2 The observed values of the liquid film coefficient could be correlated with flow rate, solution viscosity, and ionic diffusivity by the equation: kLD2/DL = 0·5 × Re0·83 × Sc0·75
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