This paper presents an approach for predicting the
solubility of hydrogen in hydrocarbons using
a cubic equation of state. Because the α function from the
Soave−Redlich−Kwong and Peng−Robinson equations of state is inadequate at temperatures far above the
critical temperature,
the binary interaction parameters required for hydrogen−hydrocarbon
systems using these
equations are typically large and strongly dependent on the
temperature. An approach is
proposed for developing a temperature-dependent α function for
hydrogen which minimizes the
need for interaction parameters. The minimization of the values of
the binary interaction
parameters between hydrogen and heavy hydrocarbons is desirable because
this produces better
predictions when the binary interaction parameters are not known and
are set to zero. A
universal procedure is also presented for interconverting the binary
interaction parameters
between the new hydrogen α function developed in this work and the
traditional Soave α function
or any other type of α function.
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