状态方程法用于原油沥青质沉淀的计算

应用ＰｅｎｇＲｏｂｉｎｓｏｎ（ＰＲ） 状态方程代替目前广泛使用的活度系数模型，对原油中沥青质的沉淀点及沉淀量进行了计算。利用实验数据反算原油中重组分的特征化参数，以解决目前原油重组分特征化较差的问题。计算结果表明，沥青质沉淀点的计算值与实验数据基本相符，但沉淀量计算结果尚不能令人满意。与常规特征化方法相比，ＰＲ 状态方程法有了较大改进

CALCULATION OF ASPHALTENE PRECIPITATION FROM CRUDE OIL USING PENG-ROBINSON EQUATION OF STATE

The Peng Robinson equation of state is used to predict the onset and amount of asphaltene precipitation from Gudao crude oil\|toluene system instead of activity coefficient models. By means of regression of experimental data, the critical parameters and acentric factors of heavy components in crude oil are obtained. The characteristic parameters calculated by using this method are better than those gained from conventional methods used widely at present. The calculation results show that the predicted values of onset of asphaltene precipitation agree with the experimental data. However, the predicted values of amount of asphaltene precipitation are unsatisfactory.