Using the membrane and feed conditions of and values for R m and K 2 determined in

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Using the membrane and feed conditions of and values for Rand K2 determined in Example 14.3 for DE microfiltration, compute and plot the permeate flux and cumulative permeate volume as a function of time. Assume a combined operation with Stage 1 at a constant permeate rate of 10 mL/minute to an upper-limit pressure drop of 25 psi, followed by Stage 2 at this pressure drop until the permeate rate drops to a lower limit of 5 mL/minute.


Example 14.3

Diluted skim milk with a protein concentration of 4.3 g/L is to undergo DEF microfiltration. Experiments have been performed using a cellulose- acetate membrane with an average pore diameter of 0.45 mm and AM = 17.3 cm2. For Stage 1 operation at a constant-permeate rate of 15 mL/minute, pressure drop across the cake and membrane increases from 0.3 psi to an upper limit of 20 psi in 400 seconds. The permeate viscosity is 1 cP. If continued in a second stage at constant ΔP at the upper limit until the permeate rate drops to 5 mL/minute, estimate the additional time of operation. Also, prepare plots of permeate volume in mL and permeate flux in mL/cm2-minute as functions of time.

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Separation Process Principles Chemical And Biochemical Principles

ISBN: 9780470481837

3rd Edition

Authors: By J. D. Seader, Ernest J. Henley, D. Keith Roper

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