渣油中溶于正庚烷但不溶于正戊烷沥青质性质分析  

Characterization of Residue (C5-C7) Asphaltene (Soluble in n-Heptane but Insoluble in n-Pentane)

作　　者：范勐[1] 孙学文[1] 许志明[1] 赵锁奇[1] 

机构地区：[1]中国石油大学重质油国家重点实验室,北京102249

出　　处：《石油化工高等学校学报》2011年第3期8-12,共5页Journal of Petrochemical Universities

基　　金：国家重点基础研究发展计划(973)资助项目(2010CB226901;2010CB226902);国家国际合作科技计划项目(2008DFA41160)

摘　　要：利用GPC,XRD,1H-NMR,SEM及HyperChem模拟等技术手段对加拿大油砂沥青减压渣油VTB中溶于正庚烷但不溶于正戊烷的沥青质((C5-C7)沥青质)的性质进行了考察,并与正戊烷沥青质、正庚烷沥青质进行了比较。结果表明,(C5-C7)沥青质的质量分数为9.80%,主要由小分子组成,其芳香片层没有形成堆积结构,在三种沥青质中拥有最低的芳碳率和芳香环数,但环烷环数的数目最多(2.60个),与芳香环相连的烷基链的长度要高于另外两种沥青质0.5个碳原子,该种沥青质颗粒尺寸较大,表面光滑、平整,能量最高(266.73 kJ/mol),稳定性最差。（C5-C7） asphaltene （soluble in n-heptane but insoluble in n-pentane） of Canada oilsand bitumen vacuum residue （VTB） was charactered and compared with n-pentane asphaltene and n-heptane asphaltene with the help of GPC, XRD, ^1H-NMR, SEM measurements and HyperChem simulation. （C5-C7） asphahene has a small yield of 9. 80% and composes mainly small moleeulars, whose average structure unit possesses the lowest aromaticity and aromatic ring number but maximum naphthenic ring number （2.60）. The length of （C5-C7） asphaltene alkane chains connected with aromatic rings is 0.5 more carbons than the other two asphaltenes. There is no aromatic sheet stacking structures existing in （C5-C7） asphaltene, which is different from n-pentane and n-heptane asphaltenes. （C5-C7） asphaltene has the biggest stable energy （286.73 kJ/mol）, leading to a worst stability, whose particles have a large dimension and smooth surface.

关 键 词：油砂沥青 正戊烷 正庚烷 沥青质 性质表征 

分 类 号：TE622[石油与天然气工程—油气加工工程]