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VUV Determining Olefin Conjugated Diolefin Content in Gasoline is Fast

Olefin content in refined gasolines needs to be kept low in order to prevent deposits from forming in fuel systems.  These deposits will decrease the efficiency of engines or even prevent them from starting. Olefins as a class are reactive species – conjugated diolefins especially so – and will polymerize in high enough concentrations. Traditional methods to measure olefins, such as ASTM D1159 (bromine number by titration) and UOP-326 (maleic anhydride) are archaic, inefficient, and widely variable in both accuracy and precision.  Even more advanced techniques like detailed hydrocarbon analysis (DHA) are not without their own issues.  On the other hand, GC-VUV uses the unique absorbance spectra of compounds and the absorbance features characteristic for each class of compounds (e.g. paraffins, olefins, aromatics) to accurately and repeatably determine PIONA values, which include olefin content, for gasoline-range fuels.

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