3种沥青中正戊烷沥青质及其亚组分的分子特性研究
Molecular Characteristics of n-Pentane Asphaltenes and Their Sub-components From Three Asphalt
黄金 1许凌子 1范思远 2宁爱民 2马诚 1罗根祥1
作者信息
- 1. 辽宁石油化工大学 石油化工学院,辽宁 抚顺 113001
- 2. 中石化(大连)石油化工研究院有限公司,辽宁 大连 116045
- 折叠
摘要
以 3 种沥青为研究对象,从中分离出正戊烷沥青质(As-5),又进一步从正戊烷沥青质(As-5)中分离出正庚烷沥青质(As-7)和重胶质两种亚组分,并分别对3种沥青的正戊烷沥青质、正庚烷沥青质和重胶进行了元素分析(EA)、凝胶色谱分析(GPC)、核磁共振氢谱分析(1H NMR)的表征分析.结果表明:每种沥青的 3 种组分中均是正庚烷沥青质的C/H原子数比、重均分子量Mw和大小分子(LMS/SMS)含量比最大,同时具有最大的芳碳率fA、芳环缩合程度和结构单元分子量usw.而重胶质的C/H原子数比、重均分子量Mw和大小分子(LMS/SMS)含量比均最小,同时具有最小的芳碳率fA、芳环缩合程度和结构单元分子量usw.正戊烷沥青质的以上平均结构参数均处于其分离出的正庚烷沥青质和重胶质二者之间.在这些表征结果的基础上,对 3种沥青中3种组分的溶解度参数δ进行计算,进一步分析了沥青组分的平均分子结构与溶解度参数之间的关系.
Abstract
Taking three kinds of asphalts as research object,the n-pentane asphaltene(As-5)was separated from asphalts,then n-heptane asphaltene(As-7)and heavy resin were separated from n-pentane asphaltene(As-5).N-pentane asphaltene(As-5),n-heptane asphaltene(As-7)and heavy resin were characterized by elemental analysis(EA),gel chromatography(GPC)and 1H-nuclear magnetic resonance spectrum(1H NMR),respectively.The results showed that n-heptane asphaltene(As-7)had the largest C/H atomic number ratio,molecular weight Mw and large/small molecular weight ratio(LMS/SMS),as well as the largest aromatic carbon ratio fA,the degree of aromatic ring condensation and the molecular weight of structural unit.The heavy resin had the lowest C/H atomic number ratio,molecular weight Mw and large/small molecular weight ratio(LMS/SMS),as well as the lowest aromatic carbon ratio fA,the degree of aromatic ring condensation and the molecular weight of structural unit.The above average structural parameters of n-pentane asphaltene were between the seprated heptane asphaltane and heavy resin.On the basis of these characterization results,the solubility parameters δ of these components were calculated,and the relationship between the average molecular structure of these components and the solubility parameters δ was analyzed.
关键词
正戊烷沥青质/正庚烷沥青质/重胶质/平均分子结构/溶解度参数Key words
n-Pentane asphaltene/n-Heptane asphaltene/Heavey resin/Average molecular structure/Solubility parameter引用本文复制引用
出版年
2024
NETL
NSTL
万方数据