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Effect of Dissolved Gases on the Densities of Hydrocarbons

1997; American Chemical Society; Volume: 42; Issue: 6 Linguagem: Inglês

10.1021/je9701588

1520-5134

S. J. Ashcroft, Mustafa Ben Isa,

Adsorption, diffusion, and thermodynamic properties of materials

Measurements have been made, using a vibrating tube densitometer, of the effects of dissolved air, nitrogen, oxygen, hydrogen, methane, and carbon dioxide on the densities of liquid hydrocarbons at 298.15 K and a total pressure of 101 060 Pa. The hydrocarbons were heptane, octane, nonane, decane, dodecane, tetradecane, hexadecane, cyclohexane, methylcyclohexane, and methylbenzene (toluene). Saturation of the liquids with gases other than carbon dioxide decreases the density by amounts ranging from about 0.004% for oxygen in hexadecane up to about 0.1% for methane in heptane. Saturation with carbon dioxide increases the densities by a maximum of almost 0.1%. For all gases, values of |Δρ| decrease with increasing carbon number in an approximately linear manner in the alkane series. Partial molar volumes of the gaseous solutes have been calculated by combining the density results with literature gas solubility data.