For a temperature of 60°C and a permeate pressure of 15.2 mmHg, Wesslein et al. [45] measured a total permeation flux of 1.6 kg/m²-h for a 17.0 wt% ethanol-in-water feed, giving a permeate of 12 wt% ethanol. Otherwise, conditions were those of Example 14.13. Calculate the permeances of ethyl alcohol and water for these conditions. Also, calculate the selectivity for water.

Example 14.13

Consider the time (t) versus volume collected (V) data for a 0.18 m2 normal-flow MF in the following table. Estimate the capacity, Vmax, of the filter and the initial flow rate, Q_o. Confirm whether the data fit a pore-constriction model for flux decline at constant TMP. Determine the flow rate at any point during filtration.

Transcribed Image Text:

Normal-Flow Filtration Data t (min) 0 0.25 0.5 0.75 1 1.25 1.5 1.75 2 V (L) 0 2.3 4.3 6.1 7.7 9.1 10.3 11.4 12.4