Chemicals in Gas Processing (CHIGP): An industrial project for the thermodynamics of complex petroleum fluids and chemicals


G. Kontogeorgis1, I. Tsivintzelis1, M. Michelsen1 and E. Stenby1

1Center for Energy Resources Engineering (CERE), Department of Chemical and Biochemical Engineering, Technical University of Denmark, Denmark

Keywords: advanced association equations of state
property: phase equilibria
material: petroleum fluids and chemicals

Since 1999, a thermodynamic project funded by major petroleum, chemical and gas companies has been carried out at the Technical University of Denmark (Department of Chemical and Biochemical Engineering). The project is called CHIGP (Chemicals in Gas Processing). The major purpose of the project is to further develop and maintain a rigorous thermodynamic model, the CPA (Cubic-Plus-Association) equation of state, which is described in detail in a recent monograph [1]. CPA is a model useful for thermodynamic calculations for mixtures of relevance to the petroleum and chemical industries e.g. mixtures of oil and gas with gas hydrate inhibitors (methanol, glycols) and organic acids. Such polar and hydrogen bonding compounds are difficult to handle with conventional models used in oil industry like cubic equations of state and CPA offers a successful alternative and is a good compromise between accuracy and simplicity. In addition to extending the model to new mixtures of industrial and scientific significance, robust algorithms for complex thermodynamic calculations and parameter estimation are being developed and new experimental measurements are being carried out when necessary in order to support the model development. Such measurements are often being carried out in collaboration with industrial partners of the CHIGP consortium. Finally, all results are disseminated in form of publications, software, etc. via the project's web-site. The deliverables include software in form of CAPE-OPEN compliant modules and user-models for the ASPEN process simulator. In this way the results can be used by industry almost as soon as they are produced. This presentation will present highlight recent with emphasis on newest developments for:
• mixtures with acid gases (CO2, H2S), water and chemicals
• glycol-containing systems
• oil-water partition coefficients of various complex chemicals used in oil & gas production, processing and transport
• complex chemicals (alkanolamines)
The future plans and new initiatives will also be presented.

References
  1. G.M. Kontogeorgis, G.K. Folas, Thermodynamic models for industrial applications. From Classical and Advanced mixing rules to association theories. John Wiley & Sons: New York, 2010.

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