Densities of n-alkanes and their mixtures at elevated pressures

Volumetric measurements of the liquid fluorinated ethers CHF2OCH2CF3and CHF2OCHFCF3at temperatures from 278.15 K to 338.13 K and pressures from 0.1 MPa to 380 MPa

“…Consequently the range of application of the Tait form of correlation may be expected not to be suitable for interpolation and prediction of ( p,V m ,T ) if the range of densities is too large. Therefore, for the present analysis of volumetric results of CHF 2 OCH 2 CF 3 and CHF 2 OCHFCF 3 , the experimental results were used only to a greatest pressure of 150 MPa; this pressure bound is arbitrary and is the same as that which enabled Dymond and Malhotra (19) to reproduce the volumetric results for n-alkanes within the accuracy of the measurements using a correlation similar to GCVRM.) A fixed value of the temperature-independent parameter C=0.2050 in equation (4) was selected for both CHF 2 OCH 2 CF 3 and CHF 2 OCHFCF 3 to match the C obtained from the Tait-equation analysis (20) of the volumetric results for some other linear fluorinated ethers.…”

An improved representation forn-alkane liquid densities

“…It has generally been found that this parameter is usually either a constant independent of the temperature or a weak function of the temperature. In their work, Dymond and Maihotra [6] showed that for the n-aikanes examined, C could be taken as a constant, equal to 0.2000.…”

“…The application of the Tait equation as a means of correlating the density of the n-alkanes was examined by Dymond and Malhotra [6]. However, recent accurate density measurements on n-pentane up to elevated pressures [7] show an average deviation of 0.35% from values given by the correlation.…”

Volumetric measurements of liquid pentan-2-one, hexan-2-one, and 4-methylpentan-2-one at temperatures from 278.15 K to 338.13 K and pressures in the range from 0.1 MPa to 386 MPa

“…It was rather unexpected to find that the approach was successful for pentan-2-one and hexan-2-one without an allowance for alterations in the number of methylene groups in the hydrocarbon chain. Dymond and Malhotra, (4) when correlating extensive volumetric data for normal alkanes, had found that such an allowance was necessary.…”

“…(3) The data were expressed as volume ratios, k = V(p)/V(p = 0.1 MPa), where V(p = 0.1 MPa) and V(p) are the volumes of a fixed mass of liquid at p = 0.1 MPa and pressure p, respectively. The k for propanone (2) and butan-2-one at each temperature were fitted with the modified Tait equation, (4) 1 − k = C·lg{(B + p)/(B + p°)},…”