Effects of cyclic structure inhibitors on the morphology and growth of tetrahydrofuran hydrate crystals

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• 作者：Sijia Li ; Yanhong Wang ; Xuemei Lang ; Shuanshi Fan
• 关键词：A1. Crystal morphology ; A2. Growth from solutions ; B1. Clathrate hydrate ; B3. Optical microscope
• 刊名：Journal of Crystal Growth
• 出版年：2013
• 出版时间：15 August, 2013
• 年：2013
• 卷：377
• 期：Complete
• 页码：101-106
• 全文大小：1447 K

文摘

Morphology and growth of hydrate crystals with cyclic structure inhibitors at a hydrate-liquid interface were directly observed through a microscopic manipulating apparatus. Tetrahydrofuran (THF) hydrate was employed as an objective. The effects of four kind of cyclic structure inhibitors, polyvinylpyrrolidone (PVP), poly(N-vinyl-2-pyrrolidone-co-2-vinyl pyridine) (PVPP), poly(2-vinyl pyridine-co-N-vinylcaprolactam) (PVPC) and poly(N-vinylcaprolactam) (PVCap), were investigated. Morphological patterns between each hydrate crystal growth from hydrate-liquid interface into droplet were found differ signi?cantly. Lamellar structure growth of hydrate crystal was observed without inhibitor, while with PVP was featheriness-like, PVPP was like long dendritic crystal, PVPC was Mimosa pudica leaf-like and PVCap was like weeds. The growth rate of hydrate crystal without inhibitor was 0.00498 mm³/s, while with PVPP, PVPC and PVCap, were 0.00339 mm³/s, 0.00350 mm³/s, 0.00386 mm³/s and 0.00426 mm³/s, respectively. Cyclic structure inhibitors can decrease the growth rate, degree of reduction in growth rate of hydrate crystals decrease with the increase of cylinder number.