A 5 kg/min stream of liquid ethanol-water at 40 °C containing 30% w/w of ethanol will be heated and separated in an adiabatic flash distillation drum at 98 kPa. If the desired composition of the vapor is 60% w/w of ethanol: (a) What will be the composition (w/w fraction or %) of the liquid at the bottom? (b) What will be the temperature (°C) in the drum? (c) What will be the mass flow rates (kg/min) of vapor and liquid streams leaving the unit? (d) Assuming there is no heat loss in the drum (adiabatic) and the streams are in thermodynamic equilibrium. What is the amount of heat required (kW) to perform this operation?
A 5 kg/min stream of liquid ethanol-water at 40 °C containing 30% w/w of ethanol will be heated and separated in an adiabatic flash distillation drum at 98 kPa. If the desired composition of the vapor is 60% w/w of ethanol: (a) What will be the composition (w/w fraction or %) of the liquid at the bottom? (b) What will be the temperature (°C) in the drum? (c) What will be the mass flow rates (kg/min) of vapor and liquid streams leaving the unit? (d) Assuming there is no heat loss in the drum (adiabatic) and the streams are in thermodynamic equilibrium. What is the amount of heat required (kW) to perform this operation?
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
3. A 5 kg/min stream of liquid ethanol-water at 40 °C containing 30% w/w of ethanol will be heated and separated in an adiabatic flash distillation drum at 98 kPa. If the desired composition of the vapor is 60% w/w of ethanol:
(a) What will be the composition (w/w fraction or %) of the liquid at the bottom?
(b) What will be the temperature (°C) in the drum?
(c) What will be the mass flow rates (kg/min) of vapor and liquid streams leaving the unit?
(d) Assuming there is no heat loss in the drum (adiabatic) and the streams are in thermodynamic
equilibrium. What is the amount of heat required (kW) to perform this operation?
Transcribed Image Text:Enthalpy, K cal/Kg.
600
500
400
300
9.1668
200
100
Water
0°C.
de
ice-
0°C.
98.5
98
-100
526
DX
F
Auxiliary Line for Interpolating Equilibrium Compositions
.96
O.I
95⁰
94°
Solid
9.3°
92°
0.2
91°
90°
89
88
Boiling Line 1Kg/sq. cm.
Freezing Line
87
86
Dew-line, 1kg/sq.cm.
548
85
84⁰
83⁰
-100°C. A
80°
60°
40°
20⁰
-0⁰
20
•28
Liquid
2
81⁰
0.4
0.5
0.3
0.6
Concentration of Alcohol, Weight Fraction
79.5°
79°
80.5
Isothermal the line 80°C.
0.7
982
0.8
78°
0.9
77.65°C
77.8*
Azeotropic
Composition
600
500
400
300
сандон
y diagram for the system Ethanol-Water from Bosnjakovic (1935), Technische Thermodynar
200
100
O
-100
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