A Chemical Equilibrium Equation of State Model for Elemental Sulfur and Sulfur-Containing Fluids

The phase behavior of natural gases containing elemental sulfur has been modeled using a chemical equilibrium model and the Peng−Robinson equation of state. Sulfur in the fluid phases is modeled as a mixture of eight species, S1 through S8, and reactions of each with hydrogen sulfide to form eight d...

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Bibliographic Details
Published in:Industrial & engineering chemistry research 2001-05, Vol.40 (9), p.2160-2167
Main Authors: Heidemann, Robert A, Phoenix, Aaron V, Karan, Kunal, Behie, Leo A
Format: Article
Language:English
Subjects:
Applied sciences
Energy
Exact sciences and technology
Fuels
Gas characteristics and properties. Sampling. Analysis
Gas industry
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Summary:The phase behavior of natural gases containing elemental sulfur has been modeled using a chemical equilibrium model and the Peng−Robinson equation of state. Sulfur in the fluid phases is modeled as a mixture of eight species, S1 through S8, and reactions of each with hydrogen sulfide to form eight different sulfane species are anticipated. A proposal is made for constructing the Peng−Robinson parameters for all species from the parameters for source substances including S8 and H2S and interaction parameters only between the source substances. A separate model is used for sulfur as a solid. Comparisons are made with data for pure sulfur and for sulfur in contact with a number of gas mixtures containing hydrogen sulfide, carbon dioxide, methane, and nitrogen. The equilibrium sulfur content of the gases is well predicted over a wide range of gas composition, temperature, and pressure.
ISSN:0888-5885
1520-5045
DOI:10.1021/ie000828u