TY - JOUR
T1 - A model for prediction of gas hydrate formation conditions in aqueous solutions containing electrolytes and/or alcohol
AU - Nasrifar, Khashayar
AU - Moshfeghian, Mahmood
N1 - Funding Information:
The authors wish to express their appreciation to the School of Engineering for use of computer facilities and the financial support of the Vice Chancellor for Research of Shiraz University.
PY - 2001
Y1 - 2001
N2 - In this contribution, a generalized method for predicting gas hydrate formation conditions in the presence of aqueous solutions, HL1V calculations, is developed. Each phase is characterized separately. In this respect, the equation of Nasrifar et al. for calculating the activity of water in the presence of electrolytes and an alcohol is extended to water in various mixtures of electrolytes, alcohol and dissolved gas. An equation for calculating the activity of water in the presence of mixtures of electrolytes is also developed. These equations are then used to characterize the aqueous phase in HL1V calculations. The modified Patel-Teja equation of state is used to characterize the vapour phase and the statistical model of van der Waals and Platteeuw for the hydrate phase. The proposed model is then compared with experimental results and other available models. No adjustable or curve-fitting parameters are used. The agreement with experimental results is very good. The comparison with other models also indicates that the proposed model predicts incipient hydrate formation conditions as good as the other models and in most cases even better.
AB - In this contribution, a generalized method for predicting gas hydrate formation conditions in the presence of aqueous solutions, HL1V calculations, is developed. Each phase is characterized separately. In this respect, the equation of Nasrifar et al. for calculating the activity of water in the presence of electrolytes and an alcohol is extended to water in various mixtures of electrolytes, alcohol and dissolved gas. An equation for calculating the activity of water in the presence of mixtures of electrolytes is also developed. These equations are then used to characterize the aqueous phase in HL1V calculations. The modified Patel-Teja equation of state is used to characterize the vapour phase and the statistical model of van der Waals and Platteeuw for the hydrate phase. The proposed model is then compared with experimental results and other available models. No adjustable or curve-fitting parameters are used. The agreement with experimental results is very good. The comparison with other models also indicates that the proposed model predicts incipient hydrate formation conditions as good as the other models and in most cases even better.
KW - Alcohol
KW - Gas hydrate
KW - Inhibition
KW - Mixed electrolyte solution
KW - Prediction
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U2 - 10.1006/jcht.2000.0811
DO - 10.1006/jcht.2000.0811
M3 - Article
AN - SCOPUS:0035545228
SN - 0021-9614
VL - 33
SP - 999
EP - 1014
JO - Journal of Chemical Thermodynamics
JF - Journal of Chemical Thermodynamics
IS - 9
ER -