Answered: An industrial spill resulted in the…

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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Question

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An industrial spill resulted in the city waste water being contaminated with ethanol. The city
decided to use a distillation column to recover the ethanol in the overhead product stream and
sell it as sanitizer. In order to sell the ethanol product it must be 70.00% ethanol by weight. The
bottom stream discharged to the water treatment pond is 5.70% ethanol by weight. Assume the
waste water is composed only of ethanol in water and it flows to the treatment plant at a rate of
272,500 kg/h and contains 12.4 wt% ethanol. The distillation column operates at steady state.
The molecular weight of ethanol is 46.07.
a. Draw and label the flow chart for this process.
b. Calculate the DOF for this process.
c. Solve for the unknown flowrates.
d. What is the mole fraction of ethanol in the feed stream?
e. Suppose the can sell 70% ethanol for $2.60 per kg. How much can the city make per year
selling the recovered ethanol?

Expert Solution

Step 1

Given

Water+ethanol→ Distillate it to get sanitizer

Overhead product,D=70% ethanol
Bottom,W=5.7% ethanol
F=272500 kg/h
In feed ethanol=12.4wt% ethanol
MW of ethanol=46.07

Find

Flow chart of this process
DOF
D and W flow rates
Mole fraction of ethanol in feed
If we sell 70% ethanol for $2.60 per kg, amount per year on selling recovered ethanol.