EBK INTRODUCTION TO CHEMICAL ENGINEERIN
8th Edition
ISBN: 9781259878091
Author: SMITH
Publisher: MCGRAW HILL BOOK COMPANY
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Textbook Question
Chapter 12, Problem 12.13P
Problems 12.9 through 12.14 refer to the Txy diagram for ethanol(1)/ethyl acetate(2) shown in Fig.12.20.
12.13. Consider an ethanol( 1 i/ethyl acetate(2) mixture with x1= 0.20. initially at 80°C and 100 kPa. Describe the evolution of phases and phase compositions as the temperature is gradually reduced to 70°C.
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Example (7):
Determine the heating surface area
개
required for the production of 2.5kg/s of
50wt% NaOH solution from 15 wt% NaOH
feed solution which entering at 100 oC to
a single effect evaporator. The steam is
available as saturated at 451.5K and the
boiling point rise (boiling point evaluation)
of 50wt% solution is 35K. the overall
heat transfer coefficient is 2000 w/m²K.
The pressure in the vapor space of the
evaporator at atmospheric pressure. The
solution has a specific heat of 4.18kJ/
kg.K. The enthalpy of vaporization under
these condition is 2257kJ/kg
Example (6):
5:48
An evaporator is concentrating F kg/h at
311K of a 20wt% solution of NaOH to 50wt
%. The saturated steam used for heating is
at 399.3K. The pressure in the vapor space
of the evaporator is 13.3 KPa abs. The
5:48
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Example 8: 900 Kg dry solid per hour is
dried in a counter current continues dryer
from 0.4 to 0.04 Kg H20/Kg wet solid
moisture content. The wet solid enters the
dryer at 25 °C and leaves at 55 °C. Fresh
air at 25 °C and 0.01Kg vapor/Kg dry air is
mixed with a part of the moist air leaving
the dryer and heated to a temperature of
130 °C in a finned air heater and enters the
dryer with 0.025 Kg/Kg alry air. Air leaving
the dryer at 85 °C and have a humidity
0.055 Kg vaper/Kg dry air. At equilibrium
the wet solid weight is 908 Kg solid per
hour.
*=0.0088
Calculate:- Heat loss from the dryer and
the rate of fresh air.
Take the specific heat of the solid
and moisture are 980 and 4.18J/Kg.K
respectively,
A. =2500 KJ/Kg.
Humid heat at 0.01 Kg vap/Kg dry=1.0238
KJ/Kg. "C. Humid heat at 0.055 Kg/Kg
1.1084 KJ/Kg. "C
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Chapter 12 Solutions
EBK INTRODUCTION TO CHEMICAL ENGINEERIN
Ch. 12 - Prob. 12.1PCh. 12 - Prob. 12.2PCh. 12 - Prob. 12.3PCh. 12 - Problems 12.3 through 12.8 refer to the Pxy...Ch. 12 - Problems 12.3 through 12.8 refer to the Pxy...Ch. 12 - Problems 12.3 through 12.8 refer to the Pxy...Ch. 12 - Problems 12.3 through 12.8 refer to the Pxy...Ch. 12 - Problems 12.3 through 12.8 refer to the Pxy...Ch. 12 - Problems 12.9 through 12.14 refer to the Txy...Ch. 12 - Problems 12.9 through 12.14 refer to the Txy...
Ch. 12 - Problems 12.9 through 12.14 refer to the Txy...Ch. 12 - Problems 12.9 through 12.14 refer to the Txy...Ch. 12 - Problems 12.9 through 12.14 refer to the Txy...Ch. 12 - Problems 12.9 through 12.14 refer to the Txy...Ch. 12 - Prob. 12.15PCh. 12 - Problems 12.16 through 12.21 refer to the Pxy...Ch. 12 - Problems 12.16 through 12.21 refer to the Pxy...Ch. 12 - Problems 12.16 through 12.21 refer to the Pxy...Ch. 12 - Problems 12.16 through 12.21 refer to the Pxy...Ch. 12 - Problems 12.16 through 12.21 refer to the Pxy...Ch. 12 - Prob. 12.21PCh. 12 - Problems 12.22 through 12.28 refer to the Txy...Ch. 12 - Problems 12.22 through 12.28 refer to the Txy...Ch. 12 - Problems 12.22 through 12.28 refer to the Txy...Ch. 12 - Problems 12.22 through 12.28 refer to the Txy...Ch. 12 - Problems 12.22 through 12.28 refer to the Txy...Ch. 12 - Problems 12.22 through 12.28 refer to the Txy...Ch. 12 - Prob. 12.28PCh. 12 - Problems 12.29 through 12.33 refer to the xy...Ch. 12 - Problems 12.29 through 12.33 refer to the xy...Ch. 12 - Problems 12.29 through 12.33 refer to the xy...Ch. 12 - Problems 12.29 through 12.33 refer to the xy...Ch. 12 - Problems 12.29 through 12.33 refer to the xy...Ch. 12 - Consider a binary liquid mixture for which the...Ch. 12 - Prob. 12.35PCh. 12 - Prob. 12.36P
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