نمایش همه 2 نتیجه
Hydrate Dissociation Conditions of Associating Mixtures by Using Cubic – Plus –Association EoS (CPA)
The classical cubicرایگان!
The classical cubic equations of state such as the SRK and PR EoS generally do not result in accurate prediction of the volumetric properties and hase equilibria of complex mixtures containing hydrogen bonding components. This is partly because of the strong hydrogen bonding forces, which cannot be well represented by the aforementioned EoSs. The Cubic plus Association (CPA) EoS has been proposed to combine a ubic EoS expression with an association term, derived from the Wertheim theory as applied in the Statistical Associating Fluid Theory (SAFT) for aking into account the hydrogen bond interactions. In this study the phase behavior of the water + hydrocarbons (methane and ethane) and forementioned hydrocarbons + methanol aqueous solution systems is modeled. The van der Waals and Platteeuw solid solution theory is applied o deal with the hydrate phase and the CPA Eos is used for modeling the fluid phases. The 4C and 2B association scheme for water and ethanol is used, respectively. Acceptable agreements are found between the represented/predicted results by the applied thermodynamic model nd the experimental phase equilibrium data of the pure methane or ethane + water systems and in the presence of methanol aqueous olution from the literature
Phase Equilibria of Hydrates of Furan, Acetone, 1,4-dioxane, Tetra n-Butyl Ammonium Chloride and Tetra n-Butyl Ammonium Floride
In this communicatioرایگان!
In this communication, we first report experimental hydrate dissociation pressures for the methane/ carbon dioxide + furan/ acetone/ 1,4- dioxane + water and the methane + tetra n-butyl ammonium chloride (TBAC) + water as well as the methane /carbon dioxide + tetra n-butyl ammonium floride (TBAF) + water systems in the temperature ranges of (269.9 to 303.3) K. An isochoric pressure-search method was used to generate the experimental data. The hydrate dissociation data are compared with the corresponding literature data and the predictions of a previously reported thermodynamic model and acceptable agreement is observed