The Solution model of hydrogen in hydrocarbons is presented for the calculation of Henry''s constant. This model includes the following considerations.
i) To avoid the large volume change of the gas in the dissolving process, the gas before mixing should be brought to the state where its molar volume is the same as that which the hydrogen whould have in the dilutely dissolved state. This partial molar volume of hydrogen at infinite dilution is obtained from the fact that in an ideal solution the free volumes of solute and solvent are equal.
ii) The mutual interaction of hydrogen molecules which are dissolved quite dilutely in a liquid phase can be neglected. Then the mixture of hydrogen and hydrocarbons is ideal in both vapor and liquid phase.
For eight hydrogen-hydrocarbon systems, except for the hydrogen-methane system, the calculated Henry''s constants agree well with the experimental results.