Thermophysical properties of normal butane from 135 to 700 K at pressures to 70 MPa

Vapour pressure of butane from 173 to 280 K

“…Eqn (1) and (2) agree particularly well between 225 and 280 K, that is, in the temperature range represented by the Aston-Messerly' data. More significant, however, is the divergence of the functions below 225 K. This divergence, presumably due to the selection of different data sets by the respective authors, represents increasing differences in pressures predicted by eqn (1) and (2) for temperatures from 225 to 134.86 K, the triple point. 2 It is our intention here to provide accurate butane vapour-pressure data in and below the range of the Aston-Messerly data.'…”

“…Kratzke et aL2 examined 16 different data sets which include vapour pressures from the triple point to the critical point. These authors used only three of the sets and their own data to obtain coefficients for eqn (2), while only five of the sets were used by Haynes and Goodwin' to obtain coefficients for eqn (1). It is noteworthy that only a single data set is accepted by both groups, namely the 11 data points detennined by Aston and Messerly.…”

A simple perturbation term for the Carnahan-Starling equation of state

“…n a and n b have a strong influence on the critical compressibility Zc, so that the number of significant figures for Oa and nb can lead to a significant change of Zc . To illustrate the performances of different EOS, Fiqure 1 shows calculated and observed critical isotherms for n-butane; the experimental data are by Haynes and Goodwin (1982). The experimental data are not well-rep resented by any of the equations of state but best by Equation (6).…”

“…Table 3 gives relative deviations between calculated and experimental molar densities. Experimental data were taken from Angus et al (1971Angus et al ( , 1976Angus et al ( , 1978Angus et al ( , 1979Angus et al ( , 1980, Goodwin et al (1976 and and Haynes and Goodwin (1982). For all fluids shown, Equation ( at high densities.…”

Prediction of Molar Volumes, Vapor Pressures and Supercritical Solubilities of Alkanes by Equations of State

“…average deviations of various equation of state in predicting molar volumes of liquids in sub-cooled and supercritical conditions compared with emenmental data 'Angus el a/., 1976.; b~oodwin, 1974.; CGoodwin and Rodcr, 1976.;*Goodwin and Haynes, 1982.;'Haynes and Goodwin, 1976. ; '~rcnkel el a/., 19972.;'Doolittlc, 1964.…”