توضیحات
Abstract
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.
Introduction
Gas hydrates are nonstoichiometric crystalline inclusion compounds formed by water and a number of small molecules at suitable temperature and pressure conditions .Light hydrocarbons such as natural gas components and some refrigerants can form hydrate when come into contact ith water under certain conditions of temperature and pressure. Hydrates consist of three main structures namely structure I (sI), sII and sH, respectively . Clathrate gas hydrates had/in their applications in different applications in chemical engineering. Particular attentions have been made refrigeration and air conditioning industry, water treatment/desalination, food industry especially producing fruit concentrates. The cubic equation of states (i.e., SRK, PR) often could not provide accurate calculated volumetric property and phase equilibrium data of complex mixtures containing hydrogen bonding compounds. This is because of the strong hydrogen bonding forces which cannot be well considered by he corresponding terms of such EoS, especially when van der Waals fluid mixing rules are used. By using statistical association fluid theory (SAFT) and some association EoS, this problem can be solved.
Year: 2013
Publisher : 2nd National Iranian Conference on Gas Hydrate (NICGH)
By : Fatemeh Nikbakht , Amir Abaas Izadpanah and Farshad Varaminian
File Information: English Language/ 11 Page / size: 861 KB
Only site members can download free of charge after registering and adding to the cart
سال : 1392
ناشر : دومین کنفرانس ملی هیدرات گاز (NICGH)
کاری از : فاطمه نیکبخت، امیرعباس ایزدپناه و فرشاد ورامینین
اطلاعات فایل : زبان انگلیسی / 11 صفحه / حجم : KB 861
نقد و بررسیها
هنوز بررسیای ثبت نشده است.