Unformatted text preview: t the top, with a feed of 79 mol%. Based on calculations using Kvalues from the SRK equation of state at 4.5 atm, the average relative volatility in LC is 2.5. In UC, the N2 composition ranges from about 1 mol% at the bottom to 99 mol% at the top, with a feed of 55 mol%. Based on calculations using Kvalues from the SRK equation of state at 1 atm, the average relative volatility in UC is 4.0. Using Eq. (73), equilibrium curves for these constant cases are shown in the McCabeThiele diagram on the next page. However, so as not to clutter the diagram, the curve for UC at 1 atm is based on N2, using,
yN 2 = N 2  O2 xN 2 1+ xN 2 N 2  O 2  1 = 4 xN 2 1+ 3xN 2 (1) while the curve for LC at 4.5 atm is based on O2, using, yO 2 = O 2  N 2 xO 2 1+ xO 2 O 2  N 2  1 = (1 / 2.5) xO 2 1 + xO 2 1 / 2.5  1 = 0.4 xO 2 1 0.6 xO 2 (2) Note that the equilibrium curve for 1 atm is above the 45o line, while that for 4.5 atm is below the 45o line. Typical operating lines and qlines are shown for determinin...
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This note was uploaded on 09/08/2008 for the course CHE 244 taught by Professor Selebi during the Spring '06 term at Lehigh University .
 Spring '06
 selebi
 Distillation, pH, Mass Transfer

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