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题名	Span20等化学添加剂对甲烷水合物生成过程的影响; Effect of Span20 and Some Chemical Additives on Methane Hydrate Formation Proceed
作者	杜建伟
学位类别	硕士
答辩日期	2008-06-04
授予单位	中国科学院广州能源研究所
授予地点	广州能源研究所
导师	樊栓狮
关键词	甲烷水合物 表面活性剂 化学添加剂 促进作用 生成动力学 形成机理
其他题名	Effect of Span20 and Some Chemical Additives on Methane Hydrate Formation Proceed
中文摘要	Gas hydrates have attracted much attention recently, not only as a new natural energy resource but also as a new means for natural gas storage and transport.. Researchers have found one of the most effective methods for the reduction of power consumption in the hydrate formation process would be acceleration of the hydrate formation rates by using surfactants. Surfactants are substances that when they present even at very low concentrations, have the ability to significantly alter the surface or interfacial free energies. Therefore, surfactants have a direct effect on the hydrate formation process. Experiments on the effect of non-ionic surfactant sorbitan monododecanoate (Span 20) and some chemical additives on induction time, formation rate and gas storage density were conducted during methane hydrate formation in a high pressure reactor with a magnetic stir at 274.15±0.10K, 8.30±0.10MPa. The major experimental and theorital results are briefly shown as follows: （1） The results show that the induction time with 2000ppm Span 20 was shortest: 53-167 minutes and a maximum formation rate was obtained with 4000ppm Span 20, about 10 times the rate of pure water. Moreover, at 4000ppm Span 20 also had the largest gas storage density of 145.2 V/V. On the basis of analysis on the Span 20 structure, the mechanism of surfactants promoting methane hydrate formation was investigated. It appears that the induction effect of tetrahydrofuranoid with two hydroxyls together with the template effect of the false hexahydroxy cycle may promote methane hydrate formation. （2） Experiments on the effect of Span 80 on induction time, formation rate and gas storage density were conducted during methane hydrate formation.The results show that the induction time with 200ppm Span 80 was 217 minutes and 1000ppm Span 80 with 1000ppm was shortest: 23 minutes and a maximum formation rate was obtained with 1000ppm Span 80: 27.9ml/min. Moreover, at 1000ppm Span 80 also had the largest gas storage density of 167V/V. （3） Besides We examined their effects of several other surfactants and chemical additives on methane hydrate formation experimentally. The results indicate that cyclohexanone、Carbon nanotube、Hexadecyl trimethyl ammonium bromide（CTAB）、β-Cyclodextrin and Ammonium chloride have unconspicuous promotion effect on methane hydrate formation；and for Ethanolamine 、Tetraoctylammonium bromide、3A/5A Molecule Sieve which can promote methane hydrate have much lower gas storage density than Span 20、Span 80 and SDS （4） Although a detailed mechanism of the acceleration effect of such surfactants has not been elucidated, it can be speculated that a cluster-promoter structure could be formed in water phase and the formed nuclei in the presence of surfactants should have a higher surface area per unit volume of the system, which would enhance the uptake rate of the guest molecules from the gas phase.
语种	中文
公开日期	2011-07-14 ; 2011-07-15
页码	64
内容类型	学位论文
源URL	[http://ir.giec.ac.cn/handle/344007/5776]
专题	中国科学院广州能源研究所
推荐引用方式 GB/T 7714	杜建伟. Span20等化学添加剂对甲烷水合物生成过程的影响, Effect of Span20 and Some Chemical Additives on Methane Hydrate Formation Proceed[D]. 广州能源研究所. 中国科学院广州能源研究所. 2008.

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