exam_3 - 10.32 Spring 2005 EXAM 3 May 16, 2005 1. (30...

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10.32 Spring 2005 EXAM 3 May 16, 2005 1.± (30 points) The attached figure is a typical gas-liquid chromatogram for a feed mixture containing four aromatic hydrocarbons, A through D. The separation was obtained using helium as a carrier gas in a column that is 1.5 m long and has an inside diameter of 6.5 mm. The column was filled with small ceramic beads coated with 0.25 wt % non-volatile liquid absorbent. The density of the liquid absorbent was 3 0.8 g/cm , the density of the beads was 2.5 g/cm , and the void fraction in the column ± b was 0.4. The helium flow rate was 15 mL/min measured at 25°C, and the column was maintained at 100°C. a)± Estimate the number of equilibrium stages, N, for each of the four compounds. b)± Estimate the height of the equilibrium stages for each of the four compounds. c)± Estimate the equilibrium constant, K i , for compounds A and D. d)± Earlier in the term we separated mixtures of hydrocarbons using distillation, an equilibrium staged process. We found the number of equilibrium stages to be 10 to 20 for excellent separation. In gas-liquid chromatography, another
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This note was uploaded on 11/27/2011 for the course CHEMICAL E 10.302 taught by Professor Clarkcolton during the Fall '04 term at MIT.

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exam_3 - 10.32 Spring 2005 EXAM 3 May 16, 2005 1. (30...

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