Abstract
The approach described in the previous paper (Twu et al., 1994a) is applied to the Redlich-Kwong cubic equation of state to develop a new generalized alpha function for the Redlich-Kwong equation. The new generalized alpha function for the Redlich-Kwong cubic equation of state reproduces the vapor pressure for hydrocarbons from the triple point to the critical point with almost identical accuracy to the generalized alpha function used with the Peng-Robinson cubic equation of state in the previous paper. This indicates that the approach developed should be general for any cubic equation of state. The alpha has been generalized in terms of reduced temperature and acentric factor, so it can be used for any hydrocarbons and petroleum fractions, with no additional characterization required than the standard methods (Twu, 1984). The new alpha function is more appropriate for the Redlich-Kwong cubic equation of state than Soave's alpha function which has been used heavily in phase behavior calculations in petroleum production and refinery industries for the last twenty years.
The approach described in the previous paper (Twu et al., 1994a) is applied to the Redlich-Kwong cubic equation of state to develop a new generalized alpha function for the Redlich-Kwong equation. The new generalized alpha function for the Redlich-Kwong cubic equation of state reproduces the vapor pressure for hydrocarbons from the triple point to the critical point with almost identical accuracy to the generalized alpha function used with the Peng-Robinson cubic equation of state in the previous paper. This indicates that the approach developed should be general for any cubic equation of state. The alpha has been generalized in terms of reduced temperature and acentric factor, so it can be used for any hydrocarbons and petroleum fractions, with no additional characterization required than the standard methods (Twu, 1984). The new alpha function is more appropriate for the Redlich-Kwong cubic equation of state than Soave's alpha function which has been used heavily in phase behavior calculations in petroleum production and refinery industries for the last twenty years.
A New Generalized Alpha Function for a Cubic Equation of State
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