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Diffusion coefficients of carbon dioxide in eight hydrocarbon liquids at temperatures between (298.15 and 423.15) K at pressures up to 69 MPa

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Title: Diffusion coefficients of carbon dioxide in eight hydrocarbon liquids at temperatures between (298.15 and 423.15) K at pressures up to 69 MPa
Authors: Cadogan, SP
Mistry, B
Wong, Y
Maitland, GC
Trusler, JPM
Item Type: Journal Article
Abstract: We report experimental measurements of the mutual diffusion coefficients in binary systems comprising CO2 + liquid hydrocarbon measured at temperatures between (298.15 and 423.15) K and at pressures up to 69 MPa. The hydrocarbons studied were the six normal alkanes hexane, heptane, octane, decane, dodecane and hexadecane, one branched alkane, 2,6,10,15,19,23-hexamethyltetracosane (squalane), and methylbenzene (toluene). The measurements were performed by the Taylor dispersion method at effectively infinite dilution of CO2 in the alkane, and the results have a typical standard relative uncertainty of 2.6%. Pressure was found to have a major impact, reducing the diffusion coefficient at a given temperature by up to 55% over the range of pressures investigated. A correlation based on the Stokes–Einstein model was investigated in which the effective hydrodynamic radius of CO2 was approximated by a linear function of the reduced molar volume of the solvent. This represented the data for the normal alkanes only with an average absolute relative deviation (AAD) of 5%. A new universal correlation, based on the rough-hard-sphere theory, was also developed which was able to correlate all the experimental data as a function of reduced molar volume with an AAD of 2.5%.
Issue Date: 14-Oct-2016
Date of Acceptance: 4-Oct-2016
URI: http://hdl.handle.net/10044/1/43239
DOI: https://dx.doi.org/10.1021/acs.jced.6b00691
ISSN: 1520-5134
Publisher: American Chemical Society
Start Page: 3922
End Page: 3932
Journal / Book Title: Journal of Chemical and Engineering Data
Volume: 61
Issue: 11
Copyright Statement: © 2016 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of Chemical and Engineering Data after peer review and technical editing by the publisher. To access the final edited and published work see https://dx.doi.org/10.1021/acs.jced.6b00691
Sponsor/Funder: Qatar Petroleum
Qatar Shell Research and Technology Center QSTP LLC
Funder's Grant Number: N/A
490000724
Keywords: Science & Technology
Physical Sciences
Technology
Thermodynamics
Chemistry, Multidisciplinary
Engineering, Chemical
Chemistry
Engineering
FLUID TRANSPORT-COEFFICIENTS
HARD-SPHERE THEORY
ROTATIONAL COUPLING PARAMETERS
NORMAL-ALKANES
ORGANIC LIQUIDS
DENSE FLUIDS
MOLECULAR-DYNAMICS
MUTUAL DIFFUSION
TRACER DIFFUSION
PREDICTION
Chemical Engineering
0904 Chemical Engineering
Publication Status: Published
Appears in Collections:Faculty of Engineering
Chemical Engineering



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