METHOD OF DETERMINING OXIDATIVE STABILITY OF MIDDLE-DISTILLATE FUELS Russian patent published in 2016 - IPC G01N33/22 

FIELD: measurement technology.

SUBSTANCE: invention relates to fuel quality control. Method comprises accelerated oxidation of fuel sample by passing oxygen at specified modes. After accelerated oxidation fuel is subjected to vacuum distillation at pressure 1-5 mm Hg to achieve fuel temperature 210 °C, mass M of still residue is measured, which is dissolved in dichloromethane, taken in ratio 1:50, then 0.001 cm³ of obtained solution is applied on modified silica gel layer outer surface of quartz rod, which is brought into contact with a mixture of n-heptane and toluene, taken in ratio 20:80. Conditions of immersion of quartz rod are given. After drying rod is subjected to thermal treatment in a burner flame on a mixture of hydrogen and air. Combustion products are detected. On a chromatogram, method includes measuring area of peaks, calculating fraction A of area corresponding to region of rod with resinous compounds. Fuel chemical stability index is evaluated by value Q, equal to product of M and A.

EFFECT: higher reliability of determination without reducing accuracy.

1 cl, 1 ex, 2 tbl, 2 dwg