Nashrieh Shimi va Mohandesi Shimi Iran

Nashrieh Shimi va Mohandesi Shimi Iran

Application of Thermodynamic Modeling to Determine the Solubility of Triethylene Glycol in Supercritical Natural Gas Conditions Using the CPA Equation of State

Document Type : Research Article

Authors
Erfan Ahmadi 1
Hassan Pahlavanzadeh 1
Ali Eslamimanesh 1
Amir H. Mohammadi 2
1 Department of Process Engineering, Faculty of Chemical Engineering, Tarbiat Modares University, Tehran, IR. IRAN
2 Thermodynamics Research Unit, Faculty of Chemical Engineering, University of KwaZulu-Natal, Durban, South Africa
Abstract
In this study, a thermodynamic model has been developed using thermodynamically consistent data and newly presented data to predict the solubility of glycols in natural gas, utilizing the CPA equation of state. For TEG, the 4C association scheme has been selected within the CPA framework, utilizing two different sets of parameters (set1 and set2). In these modelings, methane (CH4) has been considered an inert component, and carbon dioxide (CO2) has also been treated as an inert component to simplify the model and avoid excessive complexity. The model yields an average absolute relative deviation (AARD) of 22%, 17%, 78.3% and 43.1% relative to the experimental data for the systems (CH4-TEGset1), (CH4-TEGset2), (CO2-TEGset1) and (CO2-TEGset2) respectively, for the optimization of the binary interaction parameter of the systems. In the optimizations, the binary interaction parameter equation from HYSYS software, which is temperature-dependent, has been used. Based on the improved results for TEG solubility in CH4 and CO2 using the set2 parameters, compared to the thermodynamically consistent data, this model with optimized binary interaction parameters can be used for more accurate simulation, optimization, and assessment of glycol loss in natural gas dehydration units.
Keywords
CPA equation of state
Triethylene glycol
Natural gas
Binary interaction parameter
Dehydration

Subjects

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