There is a need for reliable and fast means of monitoring refining, conversion, and upgrading processes aiming to increase the yield of light distillates, and thus, reducing the oil barrel bottoms. By simultaneously utilizing the FID and mass selective detectors while splitting the column effluent in a controlled way, it is possible to obtain identical gas chromatograms and total ion chromatograms from a single run. This means that besides the intensity vs. time graphs, the intensity vs. mass and boiling point can also be obtained. As a result, physical and chemical characterization can be performed in a simple and rapid manner. Experimental results on middle, heavy distillates, and crude oil fractions show clearly the effect of upgrading processes on the chemical composition and yields of diesel, jet fuels, and high vacuum gasoil fractions. The methodology is fully compliant with ASTM D-2887, D-7213, D-6352, and D7169 for simulated distillation and the previously mentioned mass spectrometry standards. The group type analysis correlated satisfactorily with high-performance liquid chromatography data.

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To evaluate the rol of different types of compounds , normally present in gasolines, during the deposit formation in engine admission systems, reactions between benzothiophene oxides with I-octene and toluene were carried out under reflux conditions, using carbon tetrachloride as solvent. Samples of the reaction mixture were taken at 24 hr and identification was made by pyrolisis/ gas chromatography/mass spectrometry (Py/GC/MS) and mass spectrometry/mass spectrometry (MS-MS). The olefin sample reaction showed the formation of high molecular weight sulfur compound. This compound was identified as octane benzothiophene dioxide. No reaction product with toluene was found. Mechanisms of formation are proposed and the new intermediate compound was identified by MS-MS.

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