5-29. A saturated solution of calcium hydroxide enters a boiler as shown in Figure 5.29 and a fraction, p, of the water entering the boiler is vaporized. Under these circumstances a portion of the calcium hydroxide precipitates and you would like to determine the mass fraction of this suspended solid calcium hydroxide in the liquid stream leaving the boiler. Assume that no calcium hydroxide leaves in the vapor stream, that ne accumulates in the boiler, and that the temperature of the liquid entering and leaving the boiler is constant. Assume that the solid calcium hydroxide leaving the boiler is in equilibrium with the dissolved carbon dioxide, i.e., the boiler is an equilibrium stage. The solubility is often expressed as; Equilibrium relation: solubility S = g of Ca(OH)2/g of H2O however, a more precise description can be constructed. In this problem you are asked to develop a general solution for the mass fraction of the suspended solid in the liquid stream leaving the boiler in terms of p and S. For p = 0.50, 0.21, and 0.075, determine the mass fraction of suspended solid when S 2.5 x 10-3 vapor o solution solution plus Boiler suspended solids solid Ca(OH)2 in equilibrium with dissolved Ca(OH) 2 Figure 5.29. Precipitation of calcium hydroxide in a boiler 5-30
5-29. A saturated solution of calcium hydroxide enters a boiler as shown in Figure 5.29 and a fraction, p, of the water entering the boiler is vaporized. Under these circumstances a portion of the calcium hydroxide precipitates and you would like to determine the mass fraction of this suspended solid calcium hydroxide in the liquid stream leaving the boiler. Assume that no calcium hydroxide leaves in the vapor stream, that ne accumulates in the boiler, and that the temperature of the liquid entering and leaving the boiler is constant. Assume that the solid calcium hydroxide leaving the boiler is in equilibrium with the dissolved carbon dioxide, i.e., the boiler is an equilibrium stage. The solubility is often expressed as; Equilibrium relation: solubility S = g of Ca(OH)2/g of H2O however, a more precise description can be constructed. In this problem you are asked to develop a general solution for the mass fraction of the suspended solid in the liquid stream leaving the boiler in terms of p and S. For p = 0.50, 0.21, and 0.075, determine the mass fraction of suspended solid when S 2.5 x 10-3 vapor o solution solution plus Boiler suspended solids solid Ca(OH)2 in equilibrium with dissolved Ca(OH) 2 Figure 5.29. Precipitation of calcium hydroxide in a boiler 5-30
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:5-29. A saturated solution of calcium hydroxide enters a boiler as shown in Figure 5.29 and a fraction, p,
of the water entering the boiler is vaporized. Under these circumstances a portion of the calcium hydroxide
precipitates and you would like to determine the mass fraction of this suspended solid calcium hydroxide in
the liquid stream leaving the boiler. Assume that no calcium hydroxide leaves in the vapor stream, that
ne accumulates in the boiler, and that the temperature of the liquid entering and leaving the boiler is
constant. Assume that the solid calcium hydroxide leaving the boiler is in equilibrium with the dissolved
carbon dioxide, i.e., the boiler is an equilibrium stage. The solubility is often expressed as;
Equilibrium relation:
solubility
S =
g of Ca(OH)2/g of H2O
however, a more precise description can be constructed.
In this problem you are asked to develop a general solution for the mass fraction of the suspended solid
in the liquid stream leaving the boiler in terms of p and S. For p = 0.50, 0.21, and 0.075, determine the
mass fraction of suspended solid when S
2.5 x 10-3
vapor
o
solution
solution plus
Boiler
suspended solids
solid Ca(OH)2 in equilibrium
with dissolved Ca(OH) 2
Figure 5.29. Precipitation of calcium hydroxide in a boiler
5-30
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