A column packed with alumina initially contains pure cyclohexane liquid. At time zero a stream containing (0.010
Question:
A column packed with alumina initially contains pure cyclohexane liquid. At time zero a stream containing \(0.010 \mathrm{gmol} / \mathrm{L}\) of anthracene in cyclohexane is fed to an initially clean column at \(\mathrm{v}_{\text {super }}=30 \mathrm{~cm} / \mathrm{min}\). After 10 minutes, the first feed is replaced with a second feed that contains \(0.020 \mathrm{gmol} / \mathrm{L}\) anthracene in cyclohexane at \(\mathrm{v}_{\text {super }}=30 \mathrm{~cm} / \mathrm{min}\).
a. If the column length is \(\mathrm{L}_{1}=75 \mathrm{~cm}\), plot the anthracene outlet concentration profile.
b. If the column length is \(\mathrm{L}_{1}=150 \mathrm{~cm}\), plot the anthracene outlet concentration profile.
c. Suppose that for some unexplained reason you decide to linearize the isotherm at the value \(\mathrm{c}_{\mathrm{A}}=0.020\). At this concentration, the Langmuir form gives \(\mathrm{q}_{\mathrm{A}}=0.0512\). Then, in the linear form \(\mathrm{q}=\mathrm{Kc}, \mathrm{K}=0.512 / 0.02=2.56\). Resolve parts \(\mathrm{a}\) and \(\mathrm{b}\) with the linear isotherm. Compare your results with the results using the Langmuir isotherm. Data: See Examples 20-6 and 20-7.
Example 20-6
Example 20-7
Step by Step Answer:
Separation Process Engineering Includes Mass Transfer Analysis
ISBN: 9780137468041
5th Edition
Authors: Phillip Wankat