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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Published in | AIChE journal Vol. 62; no. 3; pp. 861 - 867 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
New York
Blackwell Publishing Ltd
01.03.2016
American Institute of Chemical Engineers |
Subjects | |
Online Access | Get full text |
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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 |
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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 |