Shell Component Balance(2)

Shell Component Balance(2) - Shell Component Mass/Molar...

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1 Shell Component Mass/Molar Balance Kinetics of chemical reactions Simple kinetics The rate at which A/B disappears or C appears may be described as For homogeneous reactions AB C    n n An AnA Rk ck c x   Units: R [=] mole/cm 3 .s, C A [=] mole/cm 3 (concentration in the reactive solution), n is the order of the reaction, for the first order k’’’ [=] 1/s For heterogeneous reactions   n n R kc k cx  Units: R [=] mole/cm 2 .s, C A [=] mole/cm 3 (concentration at the surface), n is the order of the reaction, for the first order k’’ [=] cm/s Component mass/molar balance for homogeneous media Chemical reaction Mass influx of A (inward arrows) Mass outflux of A (outward arrows) by convection by diffusion , A Ai i JD i  Total flux Mass flux of component A in the i-direction Mass/molar Rate In of A Mass/molar Rate out of A Mass/molar accumulation of A Rate of disappear/appear of A due to reactions uu  , A A i i nu D i  Rate of disappear/appear of A due to reactions Mass/molar Rate In of A Mass/molar Rate out of A Shell Component Mass/Molar Balance Component mass/molar balance for homogeneous media by convection by diffusion , A i x Jc D i Total flux Molar flux of component A in the i-direction cx u c u , A i x Nc x u c D i For binary system  ,, , A A Bi i x Nx NN c D i  Shell Component Mass/Molar Balance 0 1 A AAA B A A A dx c D dz cD N xd z     Diffusion through a stagnant binary gas film 1. Writing the molar flux for component A Shell Component Mass/Molar Balance
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2 1 21 2 11 z z z z AA xx     2. Molar balance for component A at steady state 1 0 0 0 1 1 A zz z
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This note was uploaded on 01/27/2011 for the course PGE 323 taught by Professor Johns during the Spring '07 term at University of Texas at Austin.

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Shell Component Balance(2) - Shell Component Mass/Molar...

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