拉曼光谱研究苯-重水间氢同位素分馏效应  

Experimental Investigations on the Hydrogen Isotope Fractionation between Benzene and Heavy Water with in-situ Raman Spectrograph

作　　者：王世霞 赵昊辰 吴嘉 郑海飞[3] WANG Shi-xia;ZHAO Hao-chen;WU Jia;ZHENG Hai-fei(School of Science,University of Shanghai for Science and Technology,Shanghai　200093,China;State Key Laboratory of Petroleum Resources and Prospecting-College of Geoscience,China University of Petroleum,Beijing102249,China;Key Laboratory of Orogenic Belts and Crustal Evolution under Ministryof Education,Peking University,Beijing　100871,China)

机构地区：[1]上海理工大学理学院,上海200093 [2]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249 [3]北京大学造山带与地壳演化教育部重点实验室,北京100871

出　　处：《光谱学与光谱分析》2018年第4期1107-1111,共5页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金青年基金项目(41103002;41403049);上海理工大学科技发展项目(16KJFZ080);油气资源与探测国家重点实验室开放课题基金项目(PRP/open-1311);中国石油大学(北京)科研基金项目(2462014YJRC002)资助

摘　　要：应用金刚石压腔结合拉曼光谱技术研究了封闭体系内氢同位素在苯和重水之间的分馏效应。物相间达到同位素交换平衡是测定稳定同位素分馏系数的前提。与高温高压条件下水抑制正烷烃、环烷烃等烷烃的氢同位素分馏不同,苯的特殊结构可促使其在实验条件下与重水发生氢同位素分馏。通过逐步升高体系温度、增大苯和重水的接触面积、300℃下恒温足够长时间等实验手段促使苯和液态重水间达到氢同位素交换平衡,测得300℃条件下苯和重水之间的氢同位素分馏系数为0.909 9。证明了原位拉曼技术测定不同液相间氢同位素分馏系数的可行性,同时扩展了金刚石压腔结合拉曼光谱技术测定不同物相间稳定同位素分馏系数的应用范围。Hydrothermal diamond-anvil cell and Raman spectrograph were used to measure thehydrogen isotope fractionation factor between benzene and heavy water at high P-T condition.The isotope fractionation factor is determined when the isotopefractionation between phases reached equilibrium.This research shows that hydrogen isotope fractionated easily between benezene and water,different from hydrogen isotope fractionation betweenwater and n-alkanes or cycloalkanes.In this study,benzene was dispersed to many small particles,indicating the increasing contacting area to heavy water when temperature reached 300℃.Sufficient heating time enabled that stable isotope phases to reach the fractionation equilibrium.The ratio of Raman peak intensities and ratio of corresponding amount ofsubstances is linearly correlated.The calculated hydrogen isotope fractionation factors between benzene and heavy water is 0.909 9 at 300℃.Taken together,it is feasible to determine the stable isotope fractionation factor betweenliquid phases with Hydrothermal Diamond-Anvil Cell combining with Raman spectroscopy.

关 键 词：金刚石压腔 拉曼光谱 氢同位素分馏系数 苯-重水 

分 类 号：O657.3[理学—分析化学]