| The solubilities of gases in n-paraffins and in wax mixtures are measured and correlated. Results of this work are useful for process design and for studying reaction kinetics of Fischer-Tropsch synthesis in slurry reactors.; A semi-flow apparatus is designed and constructed for the measurements of gas solubilities in molten waxes. Test data of CO{dollar}sb2{dollar}/toluene mixture show excellent agreement with literature data from a static apparatus.; Five gases are studied: hydrogen, carbon monoxide, methane, ethane, and carbon dioxide. Data measurements are completed for each gas in n-eicosane (C{dollar}sb{lcub}20{rcub}{dollar}), n-octacosane (C{dollar}sb{lcub}28{rcub}{dollar}), and in n-hexatriacontane (C{dollar}sb{lcub}36{rcub}{dollar}) as well as in an industrial wax over 100 to 300{dollar}spcirc{dollar}C and 10 to 50 atm. Solubilities of gas mixtures of H{dollar}sb 2{dollar} + CO in n-C{dollar}sb{lcub}28{rcub}{dollar} are also measured at several equilibrium gas compositions. The gas K-value, defined as the ratio of the composition in the vapor phase to that in the liquid phase, is found independent as gas compositions within experimental errors.; The Krichevski-Kasarnovsky equation represents well the data of binary systems. Henry's constants and partial molar volumes of gases at infinite dilution are determined from the equation.; The Redlich-Kwong-Soave equation of state is modified to describe the vapor pressures of n-paraffins up to n-C{dollar}sb{lcub}100{rcub}{dollar}. The modified equation is combined with a new mixing rule, whose derivation is based on a polymer solution theory, to correlate our data, and the results are satisfactory. Furthermore, the adjustable parameter can be correlated as an asymptotical function of the solvent molecular weight except for H{dollar}sb 2{dollar} and CO at the lowest temperature. This asymptotical behavior makes it possible to predict gas solubilities in heavy n-paraffins. The modified equation with correlated parameter can predict the gas mixture solubilities in n-C{dollar}sb{lcub}28{rcub}{dollar}. Also, gas solubilities in a wax mixture can be predicted if the wax is treated as a pure n-paraffin with the same number average molecular weight. |
