Prediction of water content of sour and acid gases |
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| Authors: | Mohsen Zirrahi Reza Azin Hassan Hassanzadeh Mahmood Moshfeghian |
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| Institution: | 1. Department of Chemical & Petroleum Engineering, Sharif University of Technology, Tehran, Iran;2. Department of Chemical Engineering, School of Engineering, Persian Gulf University, Bushehr 75169, Iran;3. Department of Chemical & Petroleum Engineering, Schulich School of Engineering, University of Calgary, Calgary, Alberta, Canada T2N 1N4;4. School of Chemical and Petroleum Engineering, Shiraz University, Shiraz, Iran;5. John M. Campbell & Company, Norman, Oklahoma, USA |
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| Abstract: | Estimating the feasibility of acid gas geological disposal requires the knowledge of the water content of the gas phase at moderate pressures and temperatures (typically below 50 MPa, below 380 K) and up to 6 mol NaCl. In this paper, a non-iterative model is developed to predict the water content of sour and acid gases at equilibrium with pure water and brine. This model is based on equating the chemical potential of water and using the modified Redlich–Kwong equation of state to calculate the fugacity of the gas phase. The water content of pure CH4, CO2 and H2S are represented with average absolute deviations of less than 3.36, 7.04 and 8.4%, respectively. Experimental data of the water content of mixtures of the acid gases were reproduced with average absolute deviations of less than 6.32%. |
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| Keywords: | Water content Acid gas Sour gas Natural gas Brine |
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