"Development of the Electrolyte CPA equation of state - Parameter estimation"
Abstract
Electrolytes play a significant role in many industrial processes, for instance, salts can increase the inhibitory effect of methanol, ethanol and glycols on the formation of gas hydrates, and have an effect of the gas solubility water-hydrocarbon mixtures. Salts also play a role in many chemical industries such as waste-water treatment, energy storage in batteries, desalination, etc.
When designing such processes and productions there is a need to know how the physical properties of the mixture in use will behave over the temperature and pressure range that is in use, and while such knowledge could be obtained through extensive experiments, with very high cost and time use as a consequence, it is more suitable to relay on trusted thermodynamics models. The advances in electrolyte models are however years behind that of other thermodynamic models.
An extension to the Cubic Plus Association (CPA) Equation of Sate has been under development in a completed PhD project (Development of an Electrolyte CPA Equation of State for Application in the Petroleum and Chemical Industries, Bjørn Maribo-Mogensen). A model has been proposed as a result of this study however this model is only in the early stage of development, especially in terms parameterization.
In this presentation the model will be presented along with the first steps of a systematic approach to parameter estimation, with results, model capabilities and limitations, and an overview of the expected goals of the PhD project.