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4) The Langmuir constants for the adsorption of water and nitrogen in a zeolite with pore volume 0.36cm3/g and mass density 0.42g/cm3 are B=6.4mmol/g and =4.8bar1 for water and B=3.6mmol/g and =0.25bar1 for nitrogen. The void fraction in the packed bed is 0.5 . The breakthrough plot for a 1% (by weight) mixture of water vapour and nitrogen at 310K and 1 bar in a benchtop adsorption column containing this zeolite is shown below. Using IAST, suggest a suitable length for an industrial unit able to dehumidify this nitrogen stream at 310K and 1 bar such that it needs to be regenerated only once every 2 hours if the maximum allowed weight fraction of water in the exit gas is 5104. CP302 Part 3 34 bench-scale experiment volumetric flow rate of feed Qf=60.0cm3/s cross sectional area of adsorption chamber a=2cm2 length of adsorption chamber L=50cm pilot-scale experiment volumetric flow rate of feed Qf=0.01m3/s cross sectional area of adsorption chamber a=0.1m2 Q4: Note a correction to the problem statement: for the bench-scale experiment, the feed flow rate is 30cm3/s AND the industrial unit should be regenerated once every hour. Y_H2O=0.016; C_f =0.60mol/m3; from IAST, eta_H 20=0.38mmol/g; For bench-scale, LES =32cm; LUB =18cm. For industrial scale, LES =2.72m;L=2.90m