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Experimental study of mixed CH 4 /CO 2 hydrate formation kinetics and modeling
Author(s) -
Zhou Xuebing,
Liang Deqing,
Yi Lizhi
Publication year - 2014
Publication title -
asia‐pacific journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.348
H-Index - 35
eISSN - 1932-2143
pISSN - 1932-2135
DOI - 10.1002/apj.1839
Subject(s) - isochoric process , clathrate hydrate , hydrate , chemistry , isothermal process , gas composition , mole fraction , crystallization , thermodynamics , methane , kinetics , kinetic energy , gas separation , analytical chemistry (journal) , chromatography , organic chemistry , biochemistry , physics , quantum mechanics , membrane
The gas hydrate formation process from CH 4 /CO 2 gas mixtures was experimentally investigated in a 5.3 L stirred reactor under isothermal‐isochoric conditions in a feed pressure of 3.5 MPa at the temperature ranging from 0.0 to 4.0 °C and CH 4 mole fraction in the feed gas ranging from 0.2 to 0.8. The composition changes of the gas phase were determined by gas chromatography, and a simplified kinetic model was used to calculate the gas composition changes in the hydrate phase. The results showed that the initial gas consumption rates and the total gas consumptions of each gas species were remarkably enhanced as the temperature decreased. The gas consumptions can be well described by the kinetic model with an overall average absolute deviation of 5.2%. In addition, the hydrate formation from CH 4 /CO 2 gas mixtures exhibited a good selectivity for CO 2 capture in the early stage of hydrate crystallization, especially at high temperatures. Increased CO 2 concentration in the feed gas could also efficiently accelerate the hydrate formation. It was suggested that CO 2 played a key function in stabilizing hydrate structure in the newly formed hydrate nuclei. © 2014 Curtin University of Technology and John Wiley & Sons, Ltd.