R141b气体水合物的晶体结构与结晶特性分析

摘要

Experimental setup for producing R141b gas hydrate crystal and its structure determination by X-ray diffraction (XRD) was designed, and the hydrate crystal was prepared using 0.10 g SDS as the surfactant. The reaction temperature curve of the preparation process and the X-ray diffraction pattern of the experimental samples were obtained to confirm that only type II clathrate hydrate crystal was formed. Diffraction patterns of the samples were quantitatively analyzed using an adiabatic method, and the results show that the amount of R141b in sample preparation has direct impact on average mass ratio and two-phase distribution of II and Ih crystals. The reaction temperature curve and the diffraction patterns combined with crystallization theory of gas hydrate indicate that the amount of R141b has key effects on crystallization micro-environment, which leads to the difference of results from the reaction temperature curve and diffraction patterns.%通过搭建制冷剂气体水合物晶体制备与X射线衍射(XRD)测试装置,制备了以0.10 g SDS作为表面活性剂的R141b气体水合物晶体,获得了水合物结晶过程的反应温度曲线和实验样品的X射线粉末衍射图谱.结合反应温度曲线对实验样品衍射图谱的定性分析,确定了水合物制备过程中仅生成II型笼状水合物晶体;利用绝热法对实验样品的衍射图谱进行物相定量分析,发现制备样品时R141b加入量对样品中II型与Ih型晶体的平均质量之比及两相分布规律具有直接影响;结合气体水合物结晶理论对结晶反应温度曲线和衍射图谱进行了讨论,认为R141b加入量对气体水合物生成的结晶微观环境有关键影响,从而导致结晶反应温度曲线与实验样品衍射图谱呈现较大差异.