doi:10.16597/j.cnki.issn.1002-154x.2026.01.009
PEG基CO₂分离膜的制备及其在石油碳氢含量测定中的应用
徐嘉琪∗ 黄德奇 王元有
（扬州工业职业技术学院化学工程学院，扬州 225127）
摘 要燃烧法测定石油中碳氢含量的传统装置依赖吸附剂分步捕获CO₂和H₂O，操作复杂。作者采用一种基于聚乙二醇的复合分离膜实现了CO₂的分离。该膜在空气中未出现显著质量损失，热稳定性好，断裂伸长率超过120%，拉伸强度达到32 MPa，力学性能较好且能选择性地透过CO₂。将该膜固定在石油检测装置的覆膜段中，通过测定冷凝水的质量和透过的CO₂体积测得乙醇的碳含量为79.95%，和理论值接近。将其应用于石油产品检测，测得原油碳含量为87.64%，汽油碳含量为85.99%，重现性较高，和元素分析仪结果偏差均小于0.5%。本研究为石油碳氢含量分析提供了一种新方法。
关键词PEG；分离膜；石油检测；碳氢含量；二氧化碳；选择性透过
Preparation of PEG-based CO₂ Separation Membrane and Its Application in Determination of Hydrocarbon Content in Petroleum
XU Jiaqi∗ HUANG Deqi WANG Yuanyou
(College of Chemical Engineering, Yangzhou Polytechnic Institute, Yangzhou 225127, China)
Abstract The traditional device for determining hydrocarbon content in petroleum by combustion method relies on adsorbents to capture CO₂ and H₂O step by step, with complicated operation. In this paper, a composite separation membrane based on polyethylene was used to separate CO₂. The membrane has no obvious mass loss in air and possesses good thermal stability. Its elongation at break is over 120% and tensile strength is 32 MPa, which shows good mechanical properties and selective permeability to CO₂. The membrane was installed on the film-covered section of petroleum testing device. The carbon content of ethanol was measured as 79.95% by detecting the mass of condensed water and the volume of permeated CO₂, which is close to the theoretical value. When applied to petroleum product detection, the carbon content of crude oil and gasoline were determined as 87.64% and 85.99% respectively. The method has high reproducibility, and the deviation from the results of elemental analyzer is less than 0.5%. This study provides a new method for the analysis of hydrocarbon content in petroleum.
Keywords polyethylene glycol; separation membrane; petroleum detection; hydrocarbon content; carbon dioxide; selective permeation