Determination of n-paraffin in DaQing diesel oil by gas chromatography mass spectrometry

The contents of n-paraffin and carbon number distribution in n-paraffin wax of diesel oil of Daqing oil field were determined by gas chromatography mass spectrometry: capillary column (30m×0.25mm×0.25µm) and FID. The optimal chromatographic conditions were as follows: FID temperature 31°C, column temperature beginning at 8°C, ending at 29°C, the increasing rate of temperature 5°C/min. Diesel oil 0# and diesel oil −20# were analyzed under above conditions. Results showed that n-paraffin was separated successfully from each other. The results would be regarded as an important reference for future research of pour point depressant and cold filter plugging point of diesel oil.