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Morphology Investigation on Cyclopentane Hydrate Formation/Dissociation in a Sub-Millimeter-Sized Capillary

1
State Key Laboratory of Heavy Oil Processing, China University of Petroleum-Beijing, Beijing 102249, China
2
Department of Engineering, China University of Petroleum-Beijing at Karamay, Sinkang 834000, China
*
Author to whom correspondence should be addressed.
Crystals 2019, 9(6), 307; https://doi.org/10.3390/cryst9060307
Received: 24 April 2019 / Revised: 4 June 2019 / Accepted: 6 June 2019 / Published: 14 June 2019
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Abstract

The formation, dissociation, and reformation of cyclopentane (CP) hydrate in a sub-millimeter-sized capillary were conducted in this work, and the morphology of CP hydrate was obtained during above processes, respectively. The influences of the supercooling degree, i.e., the hydrate formation driving force, on CP hydrate crystals’ aspect and growth rate were also investigated. The results demonstrate that CP forms hydrate with the water melting from ice at the interface between the CP and melting water at a temperature slightly above 273.15 K. With the action of hydrate memory effect, the CP hydrate in the capillary starts forming at the CP-water interface or CP–water–capillary three-phase junction and grows around the CP–water interface. The appearance and growth rate of CP hydrate are greatly influenced by the supercooling degree. It indicates that CP hydrate has a high aggregation degree and good regularity at a high supercooling degree (or a low formation temperature). The growth rate of CP hydrate crystals greatly increases with the supercooling degree. Consequently, the temperature has a significant influence on the formation of CP hydrate in the capillary. That means the features of CP hydrate crystals in a quiescent system could be determined and controlled by the temperature setting. View Full-Text
Keywords: morphology; CP hydrate crystals; sub-millimeter-sized capillary; morphology; supercooling degree morphology; CP hydrate crystals; sub-millimeter-sized capillary; morphology; supercooling degree
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Sun, Q.; Du, M.; Li, X.; Guo, X.; Yang, L. Morphology Investigation on Cyclopentane Hydrate Formation/Dissociation in a Sub-Millimeter-Sized Capillary. Crystals 2019, 9, 307.

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