Abstract: A general equation is proposed for predicting the liquid viscosities of petroleum fractions
based on a generalized pseudocompound method in which pure hydrocarbons and undefined
hydrocarbon mixtures or petroleum fractions are treated as a hypothetical pure substance
called pseudocompound which is characterized only by a boiling point and a density. T he
equation is tested by using the liquid viscosities of the petroleum fractions of typical
American crude oils and crude oils from major oil producing areas. Good agreement between
the predicted and experimental viscosities for the petroleum fractions is obtained.

Key words: viscosity, petroleum fraction, liquid

摘要： A general equation is proposed for predicting the liquid viscosities of petroleum fractions
based on a generalized pseudocompound method in which pure hydrocarbons and undefined
hydrocarbon mixtures or petroleum fractions are treated as a hypothetical pure substance
called pseudocompound which is characterized only by a boiling point and a density. T he
equation is tested by using the liquid viscosities of the petroleum fractions of typical
American crude oils and crude oils from major oil producing areas. Good agreement between
the predicted and experimental viscosities for the petroleum fractions is obtained.

关键词: viscosity;petroleum fraction;liquid