Analysis in lc the n2 composition ranges from 55 mol

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Unformatted text preview: t the top, with a feed of 79 mol%. Based on calculations using K-values 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 K-values from the SRK equation of state at 1 atm, the average relative volatility in UC is 4.0. Using Eq. (7-3), equilibrium curves for these constant cases are shown in the McCabe-Thiele 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 q-lines 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 .

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