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: McGraw-Hill Education
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Chapter 15, Problem 15.15P
(a)
Interpretation Introduction
Interpretation :
Determine the dewpoint temperature of the mixture and the composition of the first condensate if a system is condensed at constant pressure.
Concept Introduction :
At dew point of the system, the gas phase composition (y) remains the same as the overall composition of the system (z) because at the dew point, a small droplet of the liquid will form which has the negligible composition.
In condensation, the layer which has less dew point temperature, will come later and vice versa.
(b)
Interpretation Introduction
Interpretation :
Determine the temperature at which the second liquid phase appears and its initial composition.
Concept Introduction :
After the further condensation of mixture, the vapor composition of water will change but the heptane and pentane have same composition as before. So, at the temperature where first drop of hydrocarbon layer will show up, the following ratio shall be valid
(c)
Interpretation Introduction
Interpretation :
Determine the bubblepoint temperature and the composition of the last bubble of the vapor.
Concept Introduction :
At bubble point of the system, the liquid phase composition (y) remains the same as the overall composition of the system (z) because at the bubble point, a small droplet of the bubbleremains in the system after the condensation which has the negligible composition and for two immiscible layers mixture we already know that
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4.59
Using the unilateral z-transform, solve the following difference equations with the given initial
conditions.
(a) y[n]-3y[n-1] = x[n], with x[n] = 4u[n], y[− 1] = 1
(b) y[n]-5y[n-1]+6y[n-2]= x[n], with x[n] = u[n], y[-1] = 3, y[-2]= 2
Ans. (a) y[n] = -2+9(3)", n ≥ -1
(b) y[n]=+8(2)" - (3)", n ≥ -2
(30)
6. In a process design, the following process streams must be cooled or heated:
Stream
No
mCp
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°C
°C
kW/°C
1
5
350
270
2
9
270
120
3
3
100
320
4
5
120
288
Use the MUMNE algorithm for heat exchanger networks with a minimum approach
temperature of 20°C.
(5)
a. Determine the temperature interval diagram.
(3)
(2)
(10)
(10)
b. Determine the cascade diagram, the pinch temperatures, and the minimum hot and
cold utilities.
c. Determine the minimum number of heat exchangers above and below the pinch.
d. Determine a valid heat exchange network above the pinch.
e. Determine a valid heat exchange network below the pinch.
Use this equation to solve it.
Chapter 15 Solutions
Introduction to Chemical Engineering Thermodynamics
Ch. 15 - Prob. 15.1PCh. 15 - Prob. 15.2PCh. 15 - Work Prob. 15.2 for the van Laar equation. 15.2. A...Ch. 15 - Consider a binary vapor-phase mixture described by...Ch. 15 - Prob. 15.5PCh. 15 - It has been suggested that a value for GEof at...Ch. 15 - Pure liquid species 2 and 3 are for practical...Ch. 15 - It is demonstrated in Ex. 15.5 that the Wilson...Ch. 15 - Vapor sulfur hexafluoride SF6 at pressures of...Ch. 15 - Prob. 15.10P
Ch. 15 - Toluene(l) and water (2) are essentially...Ch. 15 - n-Heptane(l) and water (2) are essentially...Ch. 15 - Consider a binary system of species 1 and 2 in...Ch. 15 - Prob. 15.14PCh. 15 - 15.15. Work the preceding problem for mole...Ch. 15 - The Case I behavior for SLE (Sec. 15.4) has an...Ch. 15 - Prob. 15.17PCh. 15 - Prob. 15.18PCh. 15 - Prob. 15.19PCh. 15 - Estimate the solubility of naphthalene! 1) in...Ch. 15 - Prob. 15.21PCh. 15 - 15.22. The UNILAN equation for pure-species...Ch. 15 - In Ex. 15.8, Henry's constant for adsorption k,...Ch. 15 - It was assumed in the development of Eq. (15.39)...Ch. 15 - Suppose that the adsorbate equation of state is...Ch. 15 - Suppose that the adsorbate equation of state is...Ch. 15 - Derive the result given in the third step of the...Ch. 15 - Consider a ternary system comprising solute...Ch. 15 - It is possible in principle for a binary liquid...Ch. 15 - With V2=V2 , Eq.(15.66) for the osmotic pressure...Ch. 15 - A liquid-process feed stream F contains 99 mol-%...Ch. 15 - At 25°C the solubility of n-hexane in water is 2...Ch. 15 - A binary liquid mixture is only partially miscible...Ch. 15 - The spinodal curve for a binary liquid system is...Ch. 15 - Prob. 15.36PCh. 15 - Many fluids could be used as solvent species for...
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