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How were the points determined on the isotherms?  Read the underlined sentence

How were the points determined on the isotherms?  Read the underlined sentence

Introduction to Chemical Engineering Thermodynamics
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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How were the points determined on the isotherms?  Read the underlined sentence.  

PDF *Elementary Principles of Chemic X 59°F Sunny YouTube Draw File | E:/Elementary%20Principles%20of%20Chemical%20Processes,%204th%20Edition%20(%20PDFDrive%20).pdf X + T Read aloud Q Search 8.5c Enthalpy-Concentration Charts-Single Liquid Phase Energy balance calculations on liquid-phase systems involving mixtures can be cumbersome when heats of mixing are significant. The calculations can be simplified for binary (two- component) systems by using an enthalpy-concentration chart, a plot of specific enthalpy versus mole fraction (or mole percent) or mass fraction (or weight percent) of one component. An Ĥ-x chart for aqueous solutions of sulfuric acid at several temperatures is shown in Figure 8.5-1. The reference conditions for the plotted enthalpies are pure liquid H₂SO4 at 77°F and liquid water at 32°F. Ĥ(Btu/lb solution) The points on the isotherms of Figure 8.5-1 were determined using the procedure outlined in the last section. Suppose, for example, you wish to calculate the specific enthalpy (Btu/lbm) of a 40 wt% sulfuric acid solution at 120°F. If you know the heat of mixing of sulfuric acid at 77°F, the process path you would follow would be to bring pure liquid water from its reference temperature of 32°F to 77°F (the sulfuric acid starts at 77°F and so does not require this step), mix the two liquids at 77°F, bring the product solution to 120°F, and calculate and add the enthalpy changes for each of these steps. 140 120 100 80 60 40 467 of 695 20 OD 0 -40 {" J 63 60 D ENG Sign in (0) + O 8:18 AM 5/17/2023
Transcribed Image Text:PDF *Elementary Principles of Chemic X 59°F Sunny YouTube Draw File | E:/Elementary%20Principles%20of%20Chemical%20Processes,%204th%20Edition%20(%20PDFDrive%20).pdf X + T Read aloud Q Search 8.5c Enthalpy-Concentration Charts-Single Liquid Phase Energy balance calculations on liquid-phase systems involving mixtures can be cumbersome when heats of mixing are significant. The calculations can be simplified for binary (two- component) systems by using an enthalpy-concentration chart, a plot of specific enthalpy versus mole fraction (or mole percent) or mass fraction (or weight percent) of one component. An Ĥ-x chart for aqueous solutions of sulfuric acid at several temperatures is shown in Figure 8.5-1. The reference conditions for the plotted enthalpies are pure liquid H₂SO4 at 77°F and liquid water at 32°F. Ĥ(Btu/lb solution) The points on the isotherms of Figure 8.5-1 were determined using the procedure outlined in the last section. Suppose, for example, you wish to calculate the specific enthalpy (Btu/lbm) of a 40 wt% sulfuric acid solution at 120°F. If you know the heat of mixing of sulfuric acid at 77°F, the process path you would follow would be to bring pure liquid water from its reference temperature of 32°F to 77°F (the sulfuric acid starts at 77°F and so does not require this step), mix the two liquids at 77°F, bring the product solution to 120°F, and calculate and add the enthalpy changes for each of these steps. 140 120 100 80 60 40 467 of 695 20 OD 0 -40 {" J 63 60 D ENG Sign in (0) + O 8:18 AM 5/17/2023
PDF *Elementary Principles of Chemic X 59°F Sunny YouTube Draw File | E:/Elementary%20Principles%20of%20Chemical%20Processes,%204th%20Edition%20(%20PDFDrive%20).pdf X + T Read aloud (Btu/lb solution) Q Search 140 120 100 80 60 40 20 0 -20 -40 -60 -80 -100 -120 -140 467 of 695 0 0.10 0.20 FIGURE 8.5-1 Enthalpy-concentration Chem. Eng. Progr., 43:314, 1952.) 32°F 60 100 40 CD 140 120 200°F 180 160 Freezing line 0.30 0.40 0.50 0.60 0.70 Mass fraction of H₂SO4 chart for H₂SO4-H₂O. (Redrawn from the data of W. D. Ross, 0.80 0.90 1.00 {" J 63 50 D ENG Sign in (0) + O 8:18 AM 5/17/2023
Transcribed Image Text:PDF *Elementary Principles of Chemic X 59°F Sunny YouTube Draw File | E:/Elementary%20Principles%20of%20Chemical%20Processes,%204th%20Edition%20(%20PDFDrive%20).pdf X + T Read aloud (Btu/lb solution) Q Search 140 120 100 80 60 40 20 0 -20 -40 -60 -80 -100 -120 -140 467 of 695 0 0.10 0.20 FIGURE 8.5-1 Enthalpy-concentration Chem. Eng. Progr., 43:314, 1952.) 32°F 60 100 40 CD 140 120 200°F 180 160 Freezing line 0.30 0.40 0.50 0.60 0.70 Mass fraction of H₂SO4 chart for H₂SO4-H₂O. (Redrawn from the data of W. D. Ross, 0.80 0.90 1.00 {" J 63 50 D ENG Sign in (0) + O 8:18 AM 5/17/2023
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