P.V.T. and Related Properties for Methane and Ethane

156

Measurements of the gas compressibility of methane were made in the region 0°to 350°, 16 to 400 atm., and 0.75 to 12.5 mole liter"1. From these results, values were derived for the compressibility factor Z = PV/RT; second, third, and fourth virial coefficients B, C, and D, respectively, in the equation PV = RT (1 + B/V + C/V2 + D/V3 + . . . ); and parameters of the Beattie-Bridgeman and Benedict-Webb-Rubin equations of state.

Section: Methodsmentioning

confidence: 82%

P-V-T Relations for Methane

Douslin¹,

Harrison²,

Moore³

et al. 1964

156

“…The volumetric behavior of methane has been reported in several studies (2,3,6,8,9). Matthews and Hurd (8) and Canjar (2) have evaluated the thermodynamic properties of methane from pressure, volume, temperature data.…”

mentioning

confidence: 99%

Multiphase and volumetric equilibria of the methane-n-decane binary system at temperatures between -36.degree. and 150.degree.

Beaudoin¹,

Kohn²

1967

In sea water, both sets of data show that over the temperature range 20°to 60°C. the solubility of gypsum is essentially independent of temperature. In the 6X brines, on the other hand, our data show a slightly steeper solubility-temperature slope than is indicated by Hara's work. DISCUSSIONThe increase in the solubility of gypsum with increasing temperature in strong brine seems to account for the formation of a calcium sulfate precipitate which does not foul heat transfer surfaces. However, our observations raise several problems. First, why does gypsum form? Even at 40°C. the data of Bock indicate that the stable form in strong brine should be anhydrite. Second, why is gypsum more soluble in sea water brine (this work) than in sodium chloride solutions (9)? It is our feeling that the answer to both of these questions may be connected with the presence of magnesium sulfate in the sea water brine.A third problem which requires exploration is the rate at which gypsum converts to anhydrite in the temperature range 40°to 60°C. or a little above. This may be very important in terms of scale control in practical sea water conversion plants.

“…Although K values for nitrogen are reported in the NGSMA data book (8) and Winn, Hadden, and Grayson (5,13) have prepared a nomograph whereby K values for nitrogen may be obtained, there is great need for more experimental data to describe the effect of nitrogen on hydrocarbon K values. This effect has been shown to be more pronounced with methane than for heavier hydrocarbon components in several experimental works (1,9,12).…”

mentioning

confidence: 88%

“…The volumetric behavior of methane has been studied extensively (1,3,(8)(9)(10)(11). Matthews (9) and Canjar (1) have evaluated the thermodynamic properties of methane from the P-V-Tdata.…”

mentioning

confidence: 99%

Heterogeneous Phase and Volumetric Equilibrium in the Methane-n-Nonane System.

Shipman¹,

Kohn²

1966

urements of the conductivity increasingly more difficult.Therefore, the data in the polyphosphoric acid region would be expected to be less accurate than below 100% H3PO4. II are some interpolated values for the conductivity of phosphoric acid which are representative of results obtained in this work and by others (5, 6, 7). The values found in this work are consistently higher than the values reported by Kakulin and Fedorchenko (5) and elsewhere (7). However, values found in this work are lower than those of Keidel (6). The limited amount of experimental detail regarding sample preparation, analysis, and thermal history in the three reports cited does not allow for a critical comparison with this work. Shown in Table