A saturated liquid feed of 500 mol/h at the boiling point contains 30 mol% ethanol and 70% water is to be fractionated at 101.32 kPa abs to give a distillate containing 90% ethanol and bottoms containing 3% ethanol. The reflux ratio used is 2.5:1. a. Calculate the amounts and compositions of distillate and bottom products, theoretical number of trays and the feed tray number. b. Determine the actual tray number of trays needed If the Murphree tray efficiency is 0.6 and also calculate the overall tray efficiency. (Use eq. data from App. A.3-23 Equilibrium data for ethanol-water system at 101.32 kPa (1 Atm).)
A saturated liquid feed of 500 mol/h at the boiling point contains 30 mol% ethanol and 70% water is to be fractionated at 101.32 kPa abs to give a distillate containing 90% ethanol and bottoms containing 3% ethanol. The reflux ratio used is 2.5:1. a. Calculate the amounts and compositions of distillate and bottom products, theoretical number of trays and the feed tray number. b. Determine the actual tray number of trays needed If the Murphree tray efficiency is 0.6 and also calculate the overall tray efficiency. (Use eq. data from App. A.3-23 Equilibrium data for ethanol-water system at 101.32 kPa (1 Atm).)
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:A.3-23 Equilibrium Data for Ethanol-Water System at 101.325 kPa (1 Atm)*
V apor-Liquid Equilibria,
Mass Fraction Ethanol
Vapor-Liquid Equilibria,
Temperature Mass Fraction Ethanol
Enthalpy
(btu/lb_ of mixture)
Enthalpy
(kJ/kg of mixture)
Temperature
Temperature
Mass
°C
"F
°C
°F
°C
°F
Fraction Liquid
Vapor
Liquid
Vapor
212
180.1
1150
418.9
2675
0.600
0.700
81.0
177.8
0.794
100.0
100.0 212
208.5
95.2 203.4
91.8
0.822
0.1
1082
943
371.7
2517
0.192
0.377
98.1
0.020
80.1 176.2
91.8
197.2
159.8
314.0
285.9
2193
1870
135.0
0.050
0.100
0.200
0.300
0.400
0.500
79.1
174.3
0.800
0.858
84.7
184.5
0.3
179.6
173.0
78.2 172.8
0.527
78.3
0.900
0.912
82.0
0.5
122.9
804
197.2
87.3 189.2
111.1
664
258.4
1544
0.940
0.960
0.980
0.656
0.942
80.1
176.2
0.7
173.0
173.0
96.6
89.0
526
457.5
1223
1064
224.7
0.959
0.978
78.3
78.3
84.7
184.5
0.713
78.1
172.7
0.9
1.0
· 207.0 -
83.2
82.0 179.6
0.746
0.771
78.2 172.8
78.3 173.0
181.7
1.00
1.00
• Reference state for enthalpy is pure liquid at 273 K or 0°C.
Source: Data from L. W. Cornell and R. E. Montonna, Ind. Eng. Chem., 25, 1331 (1933); and W. A. Noyes and R. R. Warſel, J. Am. Chem. Soc., 23, 463 (1901), as given by G. G. Brown, Unit
Operations. New York: John Wiley & Sons, Inc., 1950. With permission.
Transcribed Image Text:A saturated liquid feed of 500 mol/h at the boiling point contains 30 mol% ethanol and 70%
water is to be fractionated at 101.32 kPa abs to give a distillate containing 90% ethanol and
bottoms containing 3% ethanol. The reflux ratio used is 2.5:1.
a. Calculate the amounts and compositions of distillate and bottom products, theoretical
number of trays and the feed tray number.
b. Determine the actual tray number of trays needed If the Murphree tray efficiency is 0.6
and also calculate the overall tray efficiency.
(Use eq. data from App. A.3-23 Equilibrium data for ethanol-water system at 101.32 kPa (1
Atm).)
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