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A sol - gel derived - alumina membrane has a porosity = 0 . 5 , thickness = 3 m , average pore diameter d
A solgel derived alumina membrane has a porosity thickness average pore diameter assuming circular opening and pore channel tortuosity When the membrane was tested for separation of a binary gas mixture containing mol carbon monoxide CO and mol hydrogen the fluxes for and were mol and mol respectively. The feed flow rate was very large so that the feed side composition and pressure changes caused by permeation were negligible. Following are operation conditions under which gas permeation through the membrane is expected to exhibit Knudsen diffusion behavior: Temperature ; total feed pressure ; permeate pressure ~~ bar under vacuum Calculate the Knudsen theoretical separation factor ie permeation selectivity for over and the actual separation factor obtained in the above experiment. If the difference between the theoretical and actual separation factors was caused by leaking through nonselective macropores defects in the membrane, estimate the permeance of and through the nm membrane pores and the defects, respectively. Based on the calculation discuss the impact of the defects to the permeation of and respectively. NOTE: NOT ALL INFORMATION PROVIDED ARE NEEDED FOR SOLVING THE PROBLEMS Note: the theoretical separation factoer for knudsen eq Is The actual separation factor id Please answer question
A solgel derived alumina membrane has a porosity thickness average pore diameter assuming circular opening and pore channel tortuosity When the membrane was tested for separation of a binary gas mixture containing mol carbon monoxide CO and mol hydrogen the fluxes for and were mol and mol respectively. The feed flow rate was very large so that the feed side composition and pressure changes caused by permeation were negligible. Following are operation conditions under which gas permeation through the membrane is expected to exhibit Knudsen diffusion behavior:
Temperature ; total feed pressure ; permeate pressure ~~ bar under vacuum
Calculate the Knudsen theoretical separation factor ie permeation selectivity for over and the actual separation factor obtained in the above experiment.
If the difference between the theoretical and actual separation factors was caused by leaking through nonselective macropores defects in the membrane, estimate the permeance of and through the nm membrane pores and the defects, respectively. Based on the calculation discuss the impact of the defects to the permeation of and respectively.
NOTE: NOT ALL INFORMATION PROVIDED ARE NEEDED FOR SOLVING THE PROBLEMS
Note: the theoretical separation factoer for knudsen eq Is
The actual separation factor id
Please answer question
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