Abstract
Average molecular weight (AMW) is a very important parameter in the thermodynamic simulation of crude oil. N.m.r. structural analysis models can be used to obtain AMWs of high-boiling aromatic fractions, provided that the chemical shift range assumptions are chosen carefully and the number reduced to a minimum. A model using 13C spectra editing is particularly reliable, although it requires a long recording time. The models were tested on 17 narrow high-boiling aromatic fractions of a North Sea crude oil. The values obtained are in very good agreement with mass spectrometry data.
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