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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received February 27, 2002
Accepted April 29, 2002

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Phase Equilibria and Kinetic Behavior of CO2 Hydrate in Electrolyte and Porous Media Solutions: Application to Ocean Sequestration of CO2

Jong-won Lee Moon-Kyoon Chun Kyung-Min Lee Yu-Jeong Kim Huen Lee^†

Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, Korea

hlee@mail.kaist.ac.kr

Korean Journal of Chemical Engineering, July 2002, 19(4), 673-678(6), 10.1007/BF02699316

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Abstract

Understanding the phase behavior and formation kinetics of CO2 hydrate is essential for developing the sequestration process of CO2 into the deep ocean and its feasibility. Three-phase equilibria of solid hydrate, liquid water, and vapor were determined for aqueous mixtures containing CO2 and NaCl/clay to examine the effect of both ocean electrolytes and sediments on hydrate stability. Due to the capillary effect by clay pores and inhibition effect by NaCl the corresponding hydrate formation pressure appeared to be a little higher than that required for simple and pure hydrate at specified temperature. In addition, the hydrate formation kinetics of carbon dioxide in pure water and aqueous NaCl solutions with or without clay mineral were also measured at various conditions. The formation kinetic behavior was found to be strongly influenced by pressure, temperature and electrolyte concentration. A simplified kinetic model_x000D_ having two adjustable parameters was proposed and the estimated results agreed well with the experimental data.

Keywords

Carbon Dioxide Hydrate Kinetics Equilibrium Sequestration

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