An approach for the application of a cubic equation of state to hydrogen-hydrocarbon systems
- Simulation Sciences Inc., Brea, CA (United States)
Hydrogen is one of the most important gases in refineries. Hydrocracking has increased the need for basic data on vapor-liquid equilibria (VLE) in hydrogen-hydrocarbon systems. The hydrocarbons may constitute light hydrocarbons such as methane, ethane, etc., as well as heavy crudes with petroleum fraction cuts having boiling points as high as 1,600 F. This paper presents an approach for predicting the solubility of hydrogen in hydrocarbons using a cubic equation of state. Because the {alpha} 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 {alpha} 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 {alpha} function developed in this work and the traditional Soave {alpha} function or any other type of {alpha} function.
- OSTI ID:
- 225468
- Journal Information:
- Industrial and Engineering Chemistry Research, Vol. 35, Issue 3; Other Information: PBD: Mar 1996
- Country of Publication:
- United States
- Language:
- English
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