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Replacement of CH 4 in Hydrate in Porous Sediments with Liquid CO 2 Injection
Author(s) -
Zhang Yu,
Xiong LiJun,
Li XiaoSen,
Chen ZhaoYang,
Xu ChunGang
Publication year - 2014
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201300840
Subject(s) - hydrate , fugacity , clathrate hydrate , porosity , chemistry , decomposition , thermodynamics , mineralogy , materials science , chemical engineering , organic chemistry , engineering , physics
The dynamics of the replacement of CH 4 in hydrate in porous sediments with liquid CO 2 was investigated using a self‐developed experimental apparatus at different temperatures and initial pressures. The pressure increases steadily as the replacement reaction processes. The amount of the replaced CH 4 is almost the same as that of the CO 2 forming hydrate in the early stage and gradually becomes somewhat less in the later stage. The initial pressure has minor effects on the replacement rate, and temperature reduction causes a lower replacement rate. The experimental results suggest that the replacement rate is not related to the region of the temperature‐pressure conditions but is mainly affected by the fugacity differences of CH 4 hydrate decomposition and CO 2 hydrate formation.