Sublimation as a function of diffusion

Purification of large organic molecules in a tubular sublimator occurs by a combination of laminar flow, Knudsen diffusion, and volume diffusion. For laminar flow, the amount purified per area per driving force varies with pd2, where p is pressure and d is tube diameter. For Knudsen diffusion, it va...

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Bibliographic Details
Published inAIChE journal Vol. 62; no. 3; pp. 861 - 867
Main Authors Qian, Gang, Morgan, Nathan T., Holmes, Russell J., Cussler, E. L., Blaylock, D. Wayne, Froese, Robert D. J.
Format Journal Article
LanguageEnglish
Published New York Blackwell Publishing Ltd 01.03.2016
American Institute of Chemical Engineers
Subjects
Chemical engineering
Chemical engineers
Constants
Diffusion
Diffusion rate
Dilution
electronics (organic)
Electronics industry
flow (compressible)
Gas transport
Gases
Laminar flow
Molecular weight
Organic chemistry
Organic semiconductors
Pressure
Purification
Slip flow
Sublimation
Tubes
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Summary:Purification of large organic molecules in a tubular sublimator occurs by a combination of laminar flow, Knudsen diffusion, and volume diffusion. For laminar flow, the amount purified per area per driving force varies with pd2, where p is pressure and d is tube diameter. For Knudsen diffusion, it varies with d and is not a function of pressure. For volume diffusion, it is constant, consistent with experiment. This volume diffusion mechanism may offer an alternative explanation to slip flow for dilute gas transport of both organic semiconductors and common low molecular weight gases. © 2015 American Institute of Chemical Engineers AIChE J, 62: 861–867, 2016
Bibliography:istex:6B473F66C064D77D9D7477295F1CBD2F1AF135BC
ark:/67375/WNG-CVXG0NQ7-F
State of Minnesota (LCCMR)
Dreyfus Foundation
The Dow Chemical Company
ArticleID:AIC15119
This article was rated “Top Tier” based on the strength of the reviews and assessment by the
AIChE Journal
Editorial Team.
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0001-1541
1547-5905
DOI:10.1002/aic.15119