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A generalized vapor pressure equation for hydrocarbons
Author(s) -
Zia Tahir,
Thodos George
Publication year - 1974
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450520514
Subject(s) - vapor pressure , heptane , chemistry , thermodynamics , analytical chemistry (journal) , organic chemistry , physics
A reduced vapor pressure relationship of the following form has been developed:\documentclass{article}\pagestyle{empty}\begin{document}$$ \log \,P_R = A + \frac{B}{{T_R}} + \frac{C}{{T_R^2}} + DT_R^n $$\end{document}The optimum value of n was established to be 8.00 from vapor pressure data for n‐heptane. A method was developed for the determination of the constants A, B, C and D from one reliable vapor pressure point. By this procedure vapor pressures were calculated for 33 hydrocarbons, including saturated and unsaturated paraffins, naphthenes, and aromatics, and were compared with corresponding experimental values. For these substances the overall average deviation between calculated and actual vapor pressure was 0.38% (1879 points). This relationship was also applied to seven additional hydrocarbons not included in its development, and for these substances the resulting average deviation was 0.36% (99 points).