Masters Theses
Abstract
"Experimental measurements of transient adsorption of pure components and binary mixtures of propylene and propane into 13X molecular sieves, at one atmosphere, have been used to estimate the diffusivities of both components for the transport models : pore diffusion, surface diffusion, and a model whose individual component (surface) diffusivities depend linearly upon the individual component concentrations. The binary results cover concentrations of 25, 50, 75 mole% propylene, at temperatures of 25°C, 50°C, and 70°C.
While all models appear acceptable for pure component diffusion, only the interacting binary surface diffusion model offered reasonable fits to the binary data. The diffusion coefficients obtained by regression to this model could be used for design within their experimental ranges of temperature and composition. However, these coefficients do not exhibit the temperature and composition behavior expected of an activated surface diffusion process. The estimated diffusivities for pure component surface diffusion were 1.7 x 10-8 m2/sec for pure propylene and propane. At all temperatures, the four binary surface diffusivities varied with concentration. At 25°C the values ranged from Dg11 = 2.59x10-9, Dg12 = 2.67x10-9, Dg21 = 1.84x10-8, Dg22= 2.57x10-8 m2/sec at 25 mole% propylene to 5.03x10-8, 1.44x 10-8, 7x10-10, 3.81x10-9 m2/sec at 75 mole% propylene. Pure and binary pore diffusion coefficients for propylene at 25°C ranged from 3.04 to 3.32 x 10-7 m2/sec , while those for propane ranged from 3.26 to 2.84 x 10-7 m2/sec"--Abstract, page iii.
Advisor(s)
Crosser, Orrin K.
Committee Member(s)
Liapis, Athanasios I.
Ho, C. Y. (Chung You), 1933-1988
Department(s)
Chemical and Biochemical Engineering
Degree Name
M.S. in Chemical Engineering
Publisher
University of Missouri--Rolla
Publication Date
Spring 1993
Pagination
xix, 163 pages
Note about bibliography
Includes bibliographical references (page 161-162).
Rights
© 1993 Yihui Xu, All rights reserved.
Document Type
Thesis - Restricted Access
File Type
text
Language
English
Subject Headings
Adsorption -- Mathematical modelsAdsorption -- Computer simulation.Diffusion -- Mathematical modelsMass transferSurface chemistry
Thesis Number
T 6596
Print OCLC #
28764219
Electronic OCLC #
933737359
Recommended Citation
Xu, Yihui, "Evaluation of diffusion coefficients for mass transfer during adsorption of propane and propylene by cylinders of 13X molecular sieves" (1993). Masters Theses. 1233.
https://scholarsmine.mst.edu/masters_theses/1233
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