Abstract
The combustion characteristics of fuel oils are directly related to their chemical composition, which in turn depends on molecular weight distribution in these products. Gel permeation chromatography offers the advantage of short analysis time and provides reliable data on molecular weight distribution and its evaluation. Molecular weight and polydispersity of ten samples from heavy and middle distillate range have been determined. The calibration standards used for evaluating molecular weights have been the normal paraffins (C10–C36) and mono to polynuclear aromatic hydrocarbons. Number average molecular weight (M n ) of gas oils vary from 220 to 238, whereas those of lube oils from 314 to 360.
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