Name : The 40th Conference of Coal Science
Number : 40
Location : [in Japanese]
Date : October 23, 2003 - October 24, 2003
Pages 16-17
The Marlim VR was separated into asphaltene and maltene fractions using n-heptane-toluene mixtures (heptol). The separated fractions were characterized by elemental, NMR and GPC analyses. The elemental analyses of asphaltenes were not significantly different, except the oxygen content of the AS20% (3.90), which is slightly higher than others (2.06〜2.92). The AS30% was highest in H/C ratio (1.18). Molecular weight averages (Mn) of the asphaltenes are in the range of 600 to 850 daltons. Coking tests of the maltene fractions recovered from heptol containing 0-30% toluene are classified into BAD and GOOD asphaltenes. The former has higher aromaticity and quaternary carbons and produces more coke than the latter.
