Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN: 9781259696527
Author: J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher: McGraw-Hill Education
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A process using two distillation columns in series is used to separate a feed stream (flow rate of 500 kmol/hr) containing a molar composition of 10% n-propanol (NP), 15% isopropanol (IP), 35% ethanol (E), and 40% methanol (M). The term distillate is the vapor containing more volatile components that exit the top of the column and the term bottoms refers to the liquid exiting the bottom of the column. The distillate from the first column (C1) is 98% pure M with a 96% recovery of M; and the distillate from the second column (C2) is 92% pure E with a 95% recovery of E from the process feed. For these calculations, assume that the distillate from C1 contains no propanols, the distillate from C2 contains no NP, and the bottoms stream from C2 contains no M. Based on these facts, answer the following:
- Compute the flow rates in kmol/hr of each component in each feed, distillate, and bottoms assuming negligible propanols in the distillate from columns C1 and C2. Draw a block flow diagram and include a materials balance table similar to the one presented in Table 1.5 (2nd and 3rd).
- Compute the mol% purity of the propanol mixture leaving bottoms from the column
- If the ethanol recovery is fixed at 95%, what is the maximum mol% purity of the ethanol in the distillate from column C2?
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