Phase Equilibria in Hydrocarbon Systems - Volumetric Behavior of n-Heptane
01 Aug 1957-Industrial & Engineering Chemistry Chemical & Engineering Data Series (American Chemical Society)-Vol. 2, Iss: 1, pp 9-12
About: This article is published in Industrial & Engineering Chemistry Chemical & Engineering Data Series.The article was published on 1957-08-01. It has received 63 citations till now. The article focuses on the topics: Heptane & Phase (matter).
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TL;DR: In this paper, the coefficients of these short forms for the equations of state have been fitted for the fluids acetone, carbon monoxide, carbonyl sulfide, decane, hydrogen sulfide and fluoromethane.
Abstract: In a preceding project, functional forms for “short” Helmholtz energy equations of state for typical nonpolar and weakly polar fluids and for typical polar fluids were developed using simultaneous optimization. In this work, the coefficients of these short forms for the equations of state have been fitted for the fluids acetone, carbon monoxide, carbonyl sulfide, decane, hydrogen sulfide, 2-methylbutane (isopentane), 2,2-dimethylpropane (neopentane), 2-methylpentane (isohexane), krypton, nitrous oxide, nonane, sulfur dioxide, toluene, xenon, hexafluoroethane (R-116), 1,1-dichloro-1-fluoroethane (R-141b), 1-chloro-1,1-difluoroethane (R-142b), octafluoropropane (R-218), 1,1,1,3,3-pentafluoropropane (R-245fa), and fluoromethane (R-41). The 12 coefficients of the equations of state were fitted to substance specific data sets. The results show that simultaneously optimized functional forms can be applied to other fluids out of the same class of fluids for which they were optimized without significant loss of a...
629 citations
TL;DR: In this paper, the Tait equation for n-alkanes is used to calculate the liquid density of nalkanes from pentane to hexadecane over a temperature and pressure range.
Abstract: The published experimental data for n-alkanes are critically reviewed and the parameters of the Tait equation are given. This equation allows the calculation of smoothed values of liquid density of n-alkanes from pentane to hexadecane over a temperature and pressure range.
186 citations
TL;DR: In this article, the sound velocity in n-heptane has been measured up to 2634 bar and at temperatures from 185 to 310 K by the phase comparison pulse-echo method.
Abstract: The sound velocity in toluene has been measured up to 2634 bar and at temperatures from 173 to 320 K using the pulse-echo overlap method. The sound velocity in n-heptane has been measured up to 2634 bar and at temperatures from 185 to 310 K by the phase comparison pulse-echo method. The density, the isothermal compressibility, the isobaric thermal expansion and the specific heat at constant pressure of both liquids have been evaluated from the measured sound velocity, following the method of Davis and Gordon. From a comparison of the calculated densities with those obtained previously from direct measurements, it is concluded that the method is very suitable for precise determination of liquid densities under elevated pressures.
154 citations
TL;DR: In this paper, a three-parameter cubic equation of state of the van der Waals type with one parameter temperature dependent, P = RT /(V − b ) − a (T )/[ V ( V + c ) + b (3 V+ c )], has been developed for representation of liquid volumes (or densities) for asymmetric mixtures such as CO 2 and C 1 C 19 and C 10.
94 citations
TL;DR: PVT relations of liquid heptane, octane, nonane, dodecane and hexadecane have been measured at four temperatures between 30 and 120°C and at pressures up to 1200 kg/cm2, using a bellows method as mentioned in this paper.
81 citations