【摘要】 以中东减压渣油（MEVR）、加拿大油砂沥青（VTB）、辽河稠油减压渣油（LHVR）、委内瑞拉常压渣油（VAR）及减压渣油（VVR）等5种重油为原料,利用溶剂沉淀法制备正戊烷及正庚烷沥青质,采用元素组成、GPC、¹H-NMR、¹³C-NMR、XRD、SEM等分析方法和手段进行沥青质性质评价以考察其差异性。结果表明:5种重油的C₅沥青质、C₇沥青质在含量、分子结构、平均结构单元数目、分子大小、微观结构形态等方面差异明显;沥青质芳碳率在0.47～0.54之间,VTB、LHVR沥青质中参与有序堆积结构的芳香碳较少,而MEVR,VAR,VVR沥青质中该部分芳香碳则相对较多。更多还原

【Abstract】 Asphaltenes were prepared with n-pentane and n-heptane from Middle East vacuum residue（MEVR）,Canada oil sand bitumen（VTB）,China Liaohe vacuum residue（LHVR）,Venezuela atmospheric residue（VAR）,and Venezuela vacuum residue（VVR）. Those asphaltenes were compared and analyzed by element analysis,GPC,¹H-NMR,¹³C-NMR,XRD and SEM techniques. The results showed that C₅ asphaltene and C₇ asphaltene from five heavy oils have obvious differences in content,molecular structure,average number of structural units,molecular size and microstructure. Aromatic carbon ratio of those asphaltene ranged from 0.47 to 0.54. The C₇ asphaltenes of VTB and LHVR were less in aromatic carbon in ordered stacking structure,while more aromatic carbon was in MEVR,VAR and VVR asphaltene structures.更多还原