Five hundred kmol/h of liquid alcohols containing, by moles, 40% methanol (M), 35% ethanol (E), 15% isopropanol (IP), and 10% normal propanol (NP) are distilled in two distillation columns. The distillate from the first column is 98% pure M with a 96% recovery of M. The distillate from the second is 92% pure E with a 95% recovery of E from the process feed. Assume no propanols in the distillate from column C1, no M in the bottoms from column C2, and no NP in the distillate from column C2.assuming negligible propanols in the distillate from the first column, compute the flow rates in kmols/h of each component in each feed, distillate, and bottoms. Draw a labeled block-flow diagram. Include the material balances in a table like table 1.5.compute the mol% purity of the propanol mixture leaving as bottoms from the second column.If the recovery of ethanol is fixed at 95%, what is the maximum mol% purity of the ethanol in the second column?If instead, the purity of the ethanol is fixed at 92%, what is the maximum recovery of ethanol (based on the process feed)?

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Answered: Five hundred kmol/h of liquid alcohols…

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:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

Section: Chapter Questions

Problem 1.1P

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Five hundred kmol/h of liquid alcohols containing, by moles, 40% methanol (M), 35% ethanol (E), 15% isopropanol (IP), and 10% normal propanol (NP) are distilled in two distillation columns. The distillate from the first column is 98% pure M with a 96% recovery of M. The distillate from the second is 92% pure E with a 95% recovery of E from the process feed. Assume no propanols in the distillate from column C1, no M in the bottoms from column C2, and no NP in the distillate from column C2.

assuming negligible propanols in the distillate from the first column, compute the flow rates in kmols/h of each component in each feed, distillate, and bottoms. Draw a labeled block-flow diagram. Include the material balances in a table like table 1.5.
compute the mol% purity of the propanol mixture leaving as bottoms from the second column.
If the recovery of ethanol is fixed at 95%, what is the maximum mol% purity of the ethanol in the second column?
If instead, the purity of the ethanol is fixed at 92%, what is the maximum recovery of ethanol (based on the process feed)?

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