Abstract
A series of fuel products was generated by secondary hydrotreating a middle distillate fraction cut a synthetic crude oil produced by fluid-bed coking from of Athabasca bitumen. The reactions were carried out over a sulphided nickel-tungsten on alumina catalyst at severe operating conditions. The ignition quality of fuel products was determined by a series of tests using a standard cetane engine. Jet fuel combustion quality was evaluated by means of a standard smoke point test. The compositional analyses of the fuels were determined by low-resolution mass spectrometry and aromatic carbon content by 1 3 C n.m.r. Fuel product ignition and combustion properties were related to the concentrations of aromatics and compared with similar relationships obtained for distillates from delayed coking of bitumen. A method for the determination of hydrogen consumption by mass spectrometry is described and the amount of hydrogen consumed during reaction is correlated with the degree of cetane improvement. The effectiveness of fuel quality enhancement by aromatics saturation is discussed with reference to an alternative upgrading procedure involving ring-opening of naphthenes.
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