Title

Separation of steranes and hopanes by domestic X-type molecular sieves

作者

李二庭向宝力李际迪丽达尔·肉孜王汇彤马万云刘翠敏张晓刚

Authors

LI Erting XIANG Baoli LI Ji ROUZI Dilidaer WANG Huitong MA Wanyun LIU Cuimin ZHANG Xiaogang

单位

新疆砾岩油藏实验室, 新疆克拉玛依 834000 中国石油新疆油田分公司实验检测研究院, 新疆克拉玛依 834000 中国石油勘探开发研究院, 北京 100083

Organization

Xinjiang Laboratory of Petroleum Reserve in Conglomerate, Karamay, Xinjiang 834000, China Research Institute of Experiment and Testing, Xinjiang Oilfield Company, PetroChina, Karamay, Xinjiang 834000, China Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China

摘要

采用国产10X和13X型分子筛对甾烷和藿烷类生物标志物进行吸附和脱附实验，探讨两种分子筛在制备甾烷和藿烷类化合物过程中的稳定碳同位素分馏效应，为甾烷和藿烷单体化合物的分离技术提供一种可靠方法。结果表明，两种分子筛对不同类型化合物的吸附作用不同，对甾烷化合物中的5α，14α，17α-20S、5α，14β，17β-20R、5α，14β，17β-20S三种构型吸附能力最弱，其次是5α，14α，17α-20R构型的甾烷系列、β-胡萝卜烷和伽马蜡烷。13X型分子筛对藿烷组分吸附能力强于10X型分子筛，可用于藿烷类化合物的分离；而10X型分子筛对甾烷组分吸附能力强于13X型分子筛。通过控制淋洗液的用量，能够分别分离不同构型的甾烷化合物。获得的甾烷和藿烷化合物单体烃稳定碳同位素分析结果显示，分离过程中无碳同位素分馏现象，重复性非常好，说明国产10X和13X型分子筛可用于甾烷和藿烷类化合物的分离富集及其单体烃碳同位素研究。

Abstract

Domestic 10X-type and 13X-type molecular sieves were used for the adsorption and desorption experiments of steranes and hopanes, and their stable carbon isotopic fractionation by the two kinds of molecular sieves during separation process was discussed in detail. These two kinds of molecular sieves have various adsorption effects on different types of compounds. They both have the weakest adsorption capacities for 5α, 14α, 17α-20S steranes, 5α, 14β, 17β-20R steranes and 5α, 14β, 17β-20S steranes, followed by 5α, 14α, 17α-20R steranes, β-carotane, and gammacerane. The 13X-type molecular sieve has stronger adsorption capacity for hopanes than that of the 10X-type molecular sieve, which can be used for the separation of hopanes. The 10X-type molecular sieve has stronger adsorption capacity for steranes than that of the 13X-type molecular sieve. By controlling the amount of eluent, different configuration of steranes can be further separated. The stable carbon isotopes of steranes and hopanes showed that no carbon isotopic fractionation occurred during separation process and the repeatability was very good, indicating that domestic 10X-type and 13X-type molecular sieves can be used for steranes and hopanes separation.

关键词：

分子筛; 甾烷; 藿烷; 单体烃碳同位素; 生物标志化合物; 油气地球化学;

Keywords:

molecular sieve; steranes; hopanes; compound specific carbon isotope; biomarkers; petroleum geochemistry;

基金项目

新疆维吾尔自治区重点实验室开放课题 2017D04023

DOI

https://doi.org/10.11781/sysydz202104713

甾烷和藿烷的国产X型分子筛分离制备实验研究