渣油中溶于正庚烷但不溶于正戊烷沥青质性质分析

Characterizat ion of Residue (C5 -C7)Asphal tene (Soluble in#br# n -Heptane but Inso luble in n -Pentane)

中国石油大学重质油国家重点实验室

State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, P. R. China

关键词: 油砂沥青 , 正戊烷 , 正庚烷 , 沥青质 , 性质表征

(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) asphaltene has a small yield of 9.80% and composes mainly small moleculars, 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 (266.73 kJ/mol), leading to a worst stability, whose particles have a large dimension and smooth surface.

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)

10.3696/j.issn.1006-396X.2011.03.003