METHOD OF DETECTING SECONDARY RESIDUAL PRODUCTS FROM REFINING OIL IN MIXED FUELS Russian patent published in 2009 - IPC G01N33/22 G01N25/00 

FIELD: chemistry.

SUBSTANCE: invention relates to analysis and controlling quality of liquid hydrocarbon fuels and determination of possibility of prolonged storage of fuel. The method involves taking and preparing a sample, mixing it with a distillate component, heating the mixture to 100°C and evaluating the deposit. The sample is mixed with the distillate component before viscosity of the mixture reaches (1.75+0.05) mm²/s at 100°C. The required amount of mixture is poured into a pre-weighed metallic vessel m₁, and the weight of the vessel with the mixture m₂ is recorded. After heating the mixture to 100°C the vessel with the mixture is kept in a drying chamber for 50 minutes at (105+3)°C. This mixture is centrifuged at temperature sufficient for keeping molten paraffins in liquid state. The liquid part is poured out. The deposit remaining in the vessel is mixed with petroleum ether, after which the obtained solution is centrifuged. The liquid part is poured out and the deposit remaining in the vessel is dried to a constant mass m₃. Asphaltenes are then separated from this deposit, for which the deposit is mixed with toluene, centrifuged, the liquid toluene part is poured out and the deposit remaining in the vessel is dried to a constant mass m₄. After that the information indicator is calculated form the given ratio and if A < 0.005 wt %, there are no secondary residual products from refining oil in the analysed fuel.

EFFECT: more accurate detection, as well as possibility of differentiating mixed fuels.

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