Chain length dependence of the critical density of organic homologous series

Kontogeorgis, GM; Fredenslund, A; Tassios, DP

dc.contributor.author	Kontogeorgis, GM	en
dc.contributor.author	Fredenslund, A	en
dc.contributor.author	Tassios, DP	en
dc.date.accessioned	2014-03-01T01:10:53Z
dc.date.available	2014-03-01T01:10:53Z
dc.date.issued	1995	en
dc.identifier.issn	0378-3812	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/11468
dc.subject	Chain length effects	en
dc.subject	Critical density	en
dc.subject	Experimental data	en
dc.subject	Methods of calculation	en
dc.subject	Rackett equation	en
dc.subject	Theory	en
dc.subject.classification	Thermodynamics	en
dc.subject.classification	Chemistry, Physical	en
dc.subject.classification	Engineering, Chemical	en
dc.subject.other	Alcohols	en
dc.subject.other	Density (specific gravity)	en
dc.subject.other	Equations of state	en
dc.subject.other	Molecular structure	en
dc.subject.other	Molecular weight	en
dc.subject.other	Olefins	en
dc.subject.other	Paraffins	en
dc.subject.other	Alkanes	en
dc.subject.other	Alkanols	en
dc.subject.other	Alkenes	en
dc.subject.other	Chain length effects	en
dc.subject.other	Critical density	en
dc.subject.other	Rackett equations	en
dc.subject.other	Organic compounds	en
dc.title	Chain length dependence of the critical density of organic homologous series	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/0378-3812(95)02699-F	en
heal.identifier.secondary	http://dx.doi.org/10.1016/0378-3812(95)02699-F	en
heal.language	English	en
heal.publicationDate	1995	en
heal.abstract	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
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	Fluid Phase Equilibria	en
dc.identifier.doi	10.1016/0378-3812(95)02699-F	en
dc.identifier.isi	ISI:A1995RE70600004	en
dc.identifier.volume	108	en
dc.identifier.issue	1-2	en
dc.identifier.spage	47	en
dc.identifier.epage	58	en