孤东原油组分的界面张力测定

Investigation of Interfacial Tension of the Components in Gudong 1# Crude Oil

按常规四组分分离法将孤东1#原油分离为饱和分、芳香分、胶质、沥青质,它们在原油中的质量分数分别为:45 88%,22 45%,14 73%,14 43%。将各组分在原油中所占的质量分数的十分之一和煤油配制成模拟油,模拟油与蒸馏水、碱水〔w(Na2CO3)=1 2%)〕体系的界面张力分别为:35 700,13 360;24 520,4 630;22 760,5 610;19 380,0 056mN/m。并对各分离组分进行了红外光谱、元素组成、相对分子质量测定。结果表明:界面张力的大小与各组分中的含氧量有关,含氧量越高,界面张力越低。沥青质是孤东1#原油的主要活性物质;w(沥青质)=3%时,模拟油与碱水〔w(Na2CO3)=1 2%〕体系的界面张力为0 0053mN/m。

Four fractions(saturated,aromatic,resin and asphaltene)are separated from Gudong 1# crude oil in mass percent of 4588,2245,1473 and 1443 respectively.The modeloils are made with kerosene by adding each fraction separately according to 1/10 of its mass percent in crude oil.Interfacial tensions of the modeloils with distilled water and base〔w(Na2CO3)=12%〕 are respectively 35700,13360;24520,4630;22760,5610 and 19380,0056 mN/m.Four fractions are characterized by FT-IR spectroscopy and the elementary compositions and relative molecular masses are determined.The interfacial tensions are related to the oxygen contents of the fractions.Asphaltene fraction is the main interfacial active component in Gudong 1# crude oil.When the concentration of asphaltene in model oil is 3%,the interfacial tension in the oilbase system is 00053 mN/m.