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http://dx.doi.org/10.6111/JKCGCT.2013.23.2.93

Characteristics of film-type crystal growth mechanism of CO2 hydrate  

Lee, Hyunju (School of Materials Science and Engineering, Pusan National University)
Kim, Soomin (Department of Materials Science and Engineering, Korea University)
Lee, Ju-Dong (Dongnam Technology Service Division, Korea Institute of Industrial Technology)
Kim, Yangdo (School of Materials Science and Engineering, Pusan National University)
Publication Information
Journal of the Korean Crystal Growth and Crystal Technology / v.23, no.2, 2013 , pp. 93-100 More about this Journal
Abstract
Many researches have been carried out to reduce and/or to capture the major global warming gases. Especially, the hydrate formation mechanisms were intensively investigated for carbon dioxide sequestration and storage process applications. In this study, the characteristics of film-type crystal growth mechanism of carbon dioxide hydrate were comprehensively examined. Carbon dioxide hydrate crystal was formed in semi-batch type stir reactor at various pressure conditions while the temperature was fixed to be constant to reduce and minimize the guest gas solubility effects. A supply gas composition was 99.999 % of Carbon dioxide, the observation data was collected by optical microscope adopted CCD camera (Nikon DS-5M/Fi1/2M-U2). This study revealed that the guest gas pressure changes significantly altered the crystal growth mechanism and film growth rate of carbon dioxide hydrate crystal. The critical pressure of the carbon dioxide hydrate of crystal growth mechanism change was found to be 2.0 MPa. The capillary force and gas concentration gradient also significantly changed the film-type crystal growth mechanism of carbon dioxide hydrate crystal.
Keywords
Gas hydrate; $CO_2$ (Carbon dioxide); Morphology; Film growth;
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