Abstract: A specific experiment and analysis were carried out on the phenomenon of fog opacity in naphthenic rubber extender oil at low temperature by PetroChina Karamay Petrochemical Company. The results showed that the formation of mist at low temperature resulted from the trace amount of water in the oil. When the mass fraction of water was 11 μg/g in the rubber oil，the oil could still be kept clearly and brightly at low temperature. Through reforming the stripping section of vacuum column and using air impulse stripping 48 h in the air-drying tank and filter paper filtering before going out factory, the mass fraction of water in the rubber oil was controlled less than 10 μg/g and the problem of rubber oil fogging at low temperature was solved.

Key words: rubber extender oils, trace water, nephthenic oil, fog turbidity, air impulse