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Chain length dependence of the critical density of organic homologous series
This item is provided by the institution :
National Technical University of Athens
Repository :
Digital Library of National Technical University of Athens | Dspace@NTUA
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ΕΚΤ item type
Journal part
(EN)
Scientific article
(EN)
EKT year
1995
(EN)
EKT historical period
Title
Chain length dependence of the critical density of organic homologous series (EN)
Creator
Tassios, DP (EN)
Fredenslund, A (EN)
Kontogeorgis, GM (EN)
Description
Whether the critical density of organic compounds belonging to a certain homologous series increases or decreases with (increasing) molecular weight has been a challenging question over the years. Two sets of experimental data have recently appeared in the literature for the critical density of n-alkanes: Steele's data (up to n-decane) suggest that critical density increases with carbon number and reaches a limiting value. On the other hand, the data of Teja et al., 1990 which cover a broader range of n-alkanes (up to n-octadecane), reveal a decreasing trend of the critical density after a maximum at n-heptane. Teja et al. have also presented critical density measurements for 1-alkenes (up to 1-decene) and 1-alkanols (up to 1-undecanol). These data follow the same decreasing trend with the molecular weight as n-alkanes. This trend is not in agreement with the predictions of most group-contribution methods used for the prediction of critical densities. We show in this short communication that the Rackett equation when applied (in three different forms) to the calculation of the critical density provides, in addition to a number of theoretical considerations, support for Teja's data and for the particular decreasing trend of the critical density for the homologous series of n-alkanes, 1-alkenes and 1-alkanols. This conclusion indicates that special techniques, like the Rackett equation, or specific correlations based on Teja's data, should be preferred for the estimation of the critical density of organic compounds, especially for the heavier members, compared with most property estimation group-contribution methods currently available. © 1995. (EN)
Type
journalArticle (EN)
Subject
Paraffins (EN)
Chain length effects (EN)
Methods of calculation (EN)
Rackett equation (EN)
Experimental data (EN)
Molecular structure (EN)
Alkenes (EN)
Theory (EN)
Olefins (EN)
Rackett equations (EN)
Alkanols (EN)
Alkanes (EN)
Critical density (EN)
Chemistry, Physical (EN)
Molecular weight (EN)
Alcohols (EN)
Thermodynamics (EN)
Engineering, Chemical (EN)
Equations of state (EN)
Density (specific gravity) (EN)
Organic compounds (EN)
Provider
National Technical University of Athens
Repository / collection
Digital Library of National Technical University of Athens | Dspace@NTUA
Subcollections
Κεντρική Βιβλιοθήκη Ε.Μ.Π.
Ιδρυματικό Αποθετήριο
Δημοσιεύσεις μελών Δ.Ε.Π. σε περιοδικά
Journal
Fluid Phase Equilibria (EN)
Language
English
Issued
1995 (EN)
Identifier
http://hdl.handle.net/123456789/11468
10.1016/0378-3812(95)02699-F (EN)
47 (EN)
58 (EN)
ISI:A1995RE70600004 (EN)
0378-3812 (EN)
1-2 (EN)
108 (EN)
Publisher
ELSEVIER SCIENCE BV (EN)
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