Consider the diffusion of water vapor through a polypropylene (PP) sheet 2 mm thick. The pressures of H2O at the two faces are 2 kPa and 9 kPa, which are maintained constant. Assuming conditions of steady state, what is the diffusion flux, in [(cm3 STP)/cm2-s], at 298 K? Click here to access Table 6.4. J = _____________ (cm3 STP)/cm2-s
Consider the diffusion of water vapor through a polypropylene (PP) sheet 2 mm thick. The pressures of H2O at the two faces are 2 kPa and 9 kPa, which are maintained constant. Assuming conditions of steady state, what is the diffusion flux, in [(cm3 STP)/cm2-s], at 298 K? Click here to access Table 6.4. J = _____________ (cm3 STP)/cm2-s
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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Consider the diffusion of water vapor through a polypropylene (PP) sheet 2 mm thick. The pressures of H2O at the two faces are 2 kPa and 9 kPa, which are maintained constant. Assuming conditions of steady state, what is the diffusion flux, in [(cm3 STP)/cm2-s], at 298 K?
Click here to access Table 6.4.
| J = | _____________ | (cm3 STP)/cm2-s |
![Table 6.4 Permeability Coefficient PM at 25°C for Oxygen, Nitrogen, Carbon Dioxide, and Water Vapor in a Variety of Polymers
Рм
[x10¬13 (cm³ STP)(cm)/(cm²s-Pa)]
Polymer
Acronym
02
N2
CO2
H20
Polyethylene (low density)
LDPE
2.2
0.73
9.5
68
Polyethylene (high density)
HDPE
0.30
О.11
0.27
9.0
Polypropylene
PP
1.2
0.22
5.4
38
Poly(vinyl chloride)
PVC
0.034
0.0089
0.012
206
Polystyrene
PS
2.0
0.59
7.9
840
Poly(vinylidene chloride)
PVDC
0.0025
0.00044
0.015
7.0
Poly(ethylene terephthalate)
PET
0.044
0.011
0.23
Poly(ethyl methacrylate)
РЕМА
0.89
О.17
3.8
2380](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F5c91f5a1-7862-4dbe-9446-1847b869b2da%2F2769938a-d824-489a-b971-caa8ac0c8ac0%2Fnu96i5l_processed.png&w=3840&q=75)
Transcribed Image Text:Table 6.4 Permeability Coefficient PM at 25°C for Oxygen, Nitrogen, Carbon Dioxide, and Water Vapor in a Variety of Polymers
Рм
[x10¬13 (cm³ STP)(cm)/(cm²s-Pa)]
Polymer
Acronym
02
N2
CO2
H20
Polyethylene (low density)
LDPE
2.2
0.73
9.5
68
Polyethylene (high density)
HDPE
0.30
О.11
0.27
9.0
Polypropylene
PP
1.2
0.22
5.4
38
Poly(vinyl chloride)
PVC
0.034
0.0089
0.012
206
Polystyrene
PS
2.0
0.59
7.9
840
Poly(vinylidene chloride)
PVDC
0.0025
0.00044
0.015
7.0
Poly(ethylene terephthalate)
PET
0.044
0.011
0.23
Poly(ethyl methacrylate)
РЕМА
0.89
О.17
3.8
2380
Expert Solution
Step 1
Given Details:
Thickness of film ,
Pressure of Water at point 1, P1= 2 kPa
Pressure of Water at point 2, P2= 9 kPa
Assuming steady state Diffusion.
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