Demonstrate the calculations for enthalpies 1, 2, and 3.
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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Demonstrate the calculations for enthalpies 1, 2, and 3.
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448 CHAPTER 8
Balances on Nonreactive Processes
Example 8.5-2
468 of 695
CD
Basis: 1 lbm solution (0.40 lbm H₂SO4 = 4.08 x 10-3 lb-mole, 0.60 lbm H₂O = 3.33 x
10-² lb-mole)
0.60 lbm H₂O(1, 32°F) → 0.60 lbm H₂O (1,77°F)
Btu
047] (B)
77°F
AH₁ (Btu) = (0.60 lbm H₂O) [/77 (C₂)14₂0 47]
32°F
The heat capacity of liquid water is approximately 1 Btu/(lbm.°F).
• 0.40 lbm H₂SO4(77°F) + 0.60 lbm H₂O (77°F) → 1.0 lbm H₂SO4 solution (aq, 77°F)
lb-mole H₂O
Btu
lb-mole H₂SO4, lbm H₂SO4
AH₂(Btu) = (0.40 lbm H₂SO4) AĤ, 77°F, r = 8.2
Q Search
The heat of mixing can be determined from the data in Table B.11 to be -279 Btu/lb H₂SO4.
• 1.0 lbm H₂SO4 solution (aq, 77°F) → 1.0 lbm H₂SO4 solution (aq, 120°F)
120°F
AH3(Btu) = (1.0 lbm)
(Cp)40% H₂SO4 (aq) dT
77°F
The heat capacity of the 40% sulfuric acid solution is roughly 0.67 Btu/(lbm.°F).¹5
(AH₁ +AH₂ + AH3)(Btu)
• Ĥ(40% H₂SO4, 120°F) =
1.0 lbm solution
(Verify that this is the value shown in Figure 8.5-1.)
-56 Btu/lbm
If any reference temperature but 77°F had been chosen for sulfuric acid, another step would have
been included in which H₂SO4 was brought from Tref to 77°F prior to mixing.
Once someone has gone to the trouble of preparing an enthalpy-concentration chart like that
of Figure 8.5-1, energy balance calculations become relatively simple, as shown in Example 8.5-2.
single liamid phase
Concentration of an Aqueous H₂SO4 Solution
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448 CHAPTER 8
Balances on Nonreactive Processes
Example 8.5-2
468 of 695
CD
Basis: 1 lbm solution (0.40 lbm H₂SO4 = 4.08 x 10-3 lb-mole, 0.60 lbm H₂O = 3.33 x
10-² lb-mole)
0.60 lbm H₂O(1, 32°F) → 0.60 lbm H₂O (1,77°F)
Btu
047] (B)
77°F
AH₁ (Btu) = (0.60 lbm H₂O) [/77 (C₂)14₂0 47]
32°F
The heat capacity of liquid water is approximately 1 Btu/(lbm.°F).
• 0.40 lbm H₂SO4(77°F) + 0.60 lbm H₂O (77°F) → 1.0 lbm H₂SO4 solution (aq, 77°F)
lb-mole H₂O
Btu
lb-mole H₂SO4, lbm H₂SO4
AH₂(Btu) = (0.40 lbm H₂SO4) AĤ, 77°F, r = 8.2
Q Search
The heat of mixing can be determined from the data in Table B.11 to be -279 Btu/lb H₂SO4.
• 1.0 lbm H₂SO4 solution (aq, 77°F) → 1.0 lbm H₂SO4 solution (aq, 120°F)
120°F
AH3(Btu) = (1.0 lbm)
(Cp)40% H₂SO4 (aq) dT
77°F
The heat capacity of the 40% sulfuric acid solution is roughly 0.67 Btu/(lbm.°F).¹5
(AH₁ +AH₂ + AH3)(Btu)
• Ĥ(40% H₂SO4, 120°F) =
1.0 lbm solution
(Verify that this is the value shown in Figure 8.5-1.)
-56 Btu/lbm
If any reference temperature but 77°F had been chosen for sulfuric acid, another step would have
been included in which H₂SO4 was brought from Tref to 77°F prior to mixing.
Once someone has gone to the trouble of preparing an enthalpy-concentration chart like that
of Figure 8.5-1, energy balance calculations become relatively simple, as shown in Example 8.5-2.
single liamid phase
Concentration of an Aqueous H₂SO4 Solution
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