Methane and hydrogen diffuse through a porous membrane 4.0*10 -3 m thick at 0 o
ID: 787030 • Letter: M
Question
Methane and hydrogen diffuse through a porous membrane 4.0*10-3 m thick at 0oC and 1 atm. For each mole of methane diffusing through the membrane into the hydrogen, an equal amount of hydrogen diffuses into the methane (equimolar counter diffusion). The partial pressures of methane on either side of the membrane are maintained at 2.666 * 104 and 1.33*104 N/m2, respectively. Calculate the molar flux of methane into the hydrogen. An effective diffusivity of 1.0*10-5 m2/s may be assumed. (Hines book)
Explanation / Answer
J= - D[delP/delx]
J=-1.0*10^-5 * [ 2.666 * 104- 1.33*104]/4.0*10^-3 = - 33.4 N/m-sec