In situ PXRD analysis on the kinetic effect of PVP-K90 and PVCap on methane hydrate dissociation below ice point

doi:10.1016/j.fuel.2020.119491

	In situ PXRD analysis on the kinetic effect of PVP-K90 and PVCap on methane hydrate dissociation below ice point
	Zhou, Xuebing 1,2,3,4; Zhang, Qian 3; Long, Zhen 1,2,3; Liang, Deqing 1,2,3,4
刊名	FUEL
	2021-02-15
卷号	286 页码:9
关键词	Methane hydrate Hydrate dissociation X-ray diffraction Self-preservation effect
ISSN号	0016-2361
DOI	10.1016/j.fuel.2020.119491
通讯作者	Liang, Deqing(liangdq@ms.giec.ac.cn)
英文摘要	Kinetic hydrate inhibitors (KHIs) have been developed as an alternative for the prevention of hydrate plug in natural gas transportations due to economic and environmental factors. To understand the kinetic performance of KHIs comprehensively, dissociations of CH4 hydrates in the presence of PVP-K90 and PVCap were investigated below ice point. Cryo-SEM and in situ PXRD were used to provide a microscopic insight on the dissociation kinetics. Results showed that a typical CH4 hydrate dissociation at 268 K could be divided into 4 stages. The selfpreservation effect took place in the second stage accompanied with an rise in the ratio of Ih(002) to Ih(100) peaks from 0.5 to 1.1. About 30% of CH4 hydrates were suggested to dissociate into plate-like ice to form ice coatings on hydrate surface. In the presence of PVP-K90 or PVCap, the self-preservation stage reduced greatly and the initial dissociation rates of CH4 hydrates were found enhanced as the concentrations of the KHIs increased from 0.5 to 2.0 wt%. SEM images revealed that PVP-K90 was suggested to be included in the small ice crystals embedded in hydrate phase and hinder the connections of the plate-like ice crystals on hydrate surface, while PVCap was found to induce a dendritic growth of CH4 hydrate, leading to a surge in the specific surface area of CH4 hydrates which was not beneficial to the formation of ice coatings on hydrate phase. Therefore, both PVP-K90 and PVCap promoted hydrate dissociation below ice point by inhibiting the formation of selfpreservation effect.
资助项目	National Natural Science Foundation of China[51706230] ; National Key Research and Development Plan of China[2017YFC0307306] ; Guangdong Natural Science Foundation[2020A1515010374] ; Guangdong MEPP Fund[GDOE [2019]A39] ; Guangdong Special Support Program-Local innovation and entrepreneurship team project[2019BT02L278]
WOS关键词	ANOMALOUS PRESERVATION ; SELF-PRESERVATION ; GAS ; DECOMPOSITION ; DEPENDENCE ; REMOVAL ; STORAGE ; TEMPERATURE ; PERFORMANCE ; TECHNOLOGY
WOS研究方向	Energy & Fuels ; Engineering
语种	英语
出版者	ELSEVIER SCI LTD
WOS记录号	WOS:000598728800003
资助机构	National Natural Science Foundation of China ; National Key Research and Development Plan of China ; Guangdong Natural Science Foundation ; Guangdong MEPP Fund ; Guangdong Special Support Program-Local innovation and entrepreneurship team project
内容类型	期刊论文
源URL	[http://ir.giec.ac.cn/handle/344007/32367]
专题	中国科学院广州能源研究所
通讯作者	Liang, Deqing
作者单位	1.Guangdong Prov Key Lab New & Renewable Energy Res, Guangzhou 510640, Peoples R China 2.CAS Key Lab Gas Hydrate, Guangzhou 510640, Peoples R China 3.Chinese Acad Sci, Guangzhou Inst Energy Convers, Guangzhou 510640, Peoples R China 4.Chinese Acad Sci, Guangzhou Ctr Gas Hydrate Res, Guangzhou 510640, Peoples R China
推荐引用方式 GB/T 7714	Zhou, Xuebing,Zhang, Qian,Long, Zhen,et al. In situ PXRD analysis on the kinetic effect of PVP-K90 and PVCap on methane hydrate dissociation below ice point[J]. FUEL,2021,286:9.
APA	Zhou, Xuebing,Zhang, Qian,Long, Zhen,&Liang, Deqing.(2021).In situ PXRD analysis on the kinetic effect of PVP-K90 and PVCap on methane hydrate dissociation below ice point.FUEL,286,9.
MLA	Zhou, Xuebing,et al."In situ PXRD analysis on the kinetic effect of PVP-K90 and PVCap on methane hydrate dissociation below ice point".FUEL 286(2021):9.