METHOD OF DETERMINING CHEMICAL STABILITY OF MOTOR PETROL Russian patent published in 2010 - IPC G01N33/22 

FIELD: chemistry.

SUBSTANCE: method involves putting a sample into a vessel which is put into a bomb and kept in a liquid thermostat at high pressure for a given period of time. The sample is then cooled for a given a period of time at the end of which chemical stability is determined from the value of an information factor calculated using a mathematical relationship. Oxygen is fed into the sealed bomb containing the sample until achieving excess pressure of 800±10 kPa which is fixed. Temperature of ambient air is measured and the bomb is put into a liquid thermostat preheated to 120°C at which the bomb is held for 180 minutes. The bomb is then taken out of the liquid thermostat and held at ambient temperature for 180 minutes. Further, ambient temperature and oxygen pressure are then measured. The information factor A is the fraction of absorbed oxygen which is calculated from a given relationship and if A≤25%, the motor petrol is chemically highly stable and suitable for prolonged storage. If 25<A≤85%, the motor petrol is chemically stable and suitable for short-term storage.

EFFECT: increased reliability and faster determination.

2 ex, 3 tbl