Ethanol is used in alcoholic beverages, for medical purposes but it is also the most important biofuel- currently, most petrol cars in the UK use a blend of petrol with 10% ethanol. C2H5OH is produced from sugar cane and wood, and a step of the process is distillation. Design a distillation column for separation of a mixture of ethanol and water of: Group C: flow rate F = 120 kmol/h with composition z = 18% ethanol. You want to separate it into water with 1.5% ethanol and ethanol with 23% water at p = 0.95 atm condenser pressure. a) Find the flow rates of the distillate and the bottoms product. b) Extract from Aspen the Txy and the xy isobars using the NRTL method. Find the operational temperatures in the reboiler and in the condenser. c) Find the minimum number of theoretical stages Nmin required for the specified separation. What would be the value of Nmin if the specifications were to split the feed into purified water with 2% ethanol and purified 98% ethanol? Why is this not working? What is the maximum possible separation? d) Find the minimum reflux ratio Rmin, and the respective reboil ratio for the specified separation. What would Rmin be if the distillate was specified at 85% ethanol and if the feed quality is, e.g., q = 1? Where is the pinch point in this case? e) Assume a reflux ratio of R = 1.3Rmin and determine the respective reboil ratio RB and the number N of theoretical stages. Determine the optimal location of the feed stage. f) Simulate the distillation column with the parameters you chose in e), and check whether the values of R, N and RF produce a separation that fulfils the stated specifications. In Aspen, find the heat duty of the condenser and the reboiler.
Ethanol is used in alcoholic beverages, for medical purposes but it is also the most important biofuel- currently, most petrol cars in the UK use a blend of petrol with 10% ethanol. C2H5OH is produced from sugar cane and wood, and a step of the process is distillation. Design a distillation column for separation of a mixture of ethanol and water of: Group C: flow rate F = 120 kmol/h with composition z = 18% ethanol. You want to separate it into water with 1.5% ethanol and ethanol with 23% water at p = 0.95 atm condenser pressure. a) Find the flow rates of the distillate and the bottoms product. b) Extract from Aspen the Txy and the xy isobars using the NRTL method. Find the operational temperatures in the reboiler and in the condenser. c) Find the minimum number of theoretical stages Nmin required for the specified separation. What would be the value of Nmin if the specifications were to split the feed into purified water with 2% ethanol and purified 98% ethanol? Why is this not working? What is the maximum possible separation? d) Find the minimum reflux ratio Rmin, and the respective reboil ratio for the specified separation. What would Rmin be if the distillate was specified at 85% ethanol and if the feed quality is, e.g., q = 1? Where is the pinch point in this case? e) Assume a reflux ratio of R = 1.3Rmin and determine the respective reboil ratio RB and the number N of theoretical stages. Determine the optimal location of the feed stage. f) Simulate the distillation column with the parameters you chose in e), and check whether the values of R, N and RF produce a separation that fulfils the stated specifications. In Aspen, find the heat duty of the condenser and the reboiler.
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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Transcribed Image Text:Ethanol is used in alcoholic beverages, for medical purposes but it is also the most
important biofuel- currently, most petrol cars in the UK use a blend of petrol with 10%
ethanol. C2H5OH is produced from sugar cane and wood, and a step of the process is
distillation.
Design a distillation column for separation of a mixture of ethanol and water of:
Transcribed Image Text:Group C: flow rate F = 120 kmol/h with composition z = 18% ethanol. You want to
separate it into water with 1.5% ethanol and ethanol with 23% water at p = 0.95 atm
condenser pressure.
a) Find the flow rates of the distillate and the bottoms product.
b) Extract from Aspen the Txy and the xy isobars using the NRTL method. Find the
operational temperatures in the reboiler and in the condenser.
c) Find the minimum number of theoretical stages Nmin required for the specified
separation.
What would be the value of Nmin if the specifications were to split the feed into purified
water with 2% ethanol and purified 98% ethanol? Why is this not working? What is the
maximum possible separation?
d) Find the minimum reflux ratio Rmin, and the respective reboil ratio for the specified
separation.
What would Rmin be if the distillate was specified at 85% ethanol and if the feed quality
is, e.g., q = 1? Where is the pinch point in this case?
e) Assume a reflux ratio of R = 1.3Rmin and determine the respective reboil ratio RB and
the number N of theoretical stages. Determine the optimal location of the feed stage.
f) Simulate the distillation column with the parameters you chose in e), and check
whether the values of R, N and RF produce a separation that fulfils the stated specifications.
In Aspen, find the heat duty of the condenser and the reboiler.
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