【摘 要】
：
The vacuum residual from Iranian Light crude oil are separated into a series of 16 narrow fractions according to the molecular weight by the supercritical fluid
【机 构】
：
State Key Laboratory of Heavy Oil Processing,Department of Chemistry
论文部分内容阅读
The vacuum residual from Iranian Light crude oil are separated into a series of 16 narrow fractions according to the molecular weight by the supercritical fluid extraction and fractional(SFEF)technologY.The chemical element and the UV spectrum of each fraction are analyzed.The efiects of severalfactors on the interfacial tension are investigated,which are the fraction concentration in oil phase,the ratio of oil component,the salts dissolved in the water phase and the pH valne.The interfacial tension decreazes rapidly as the concentration of the residual fraction in the oil increases,showing a higher interfacial activity ofthe fraction.The interfacial tension changes,as the amount of absorption or the state ofthe fractions in the interface changes resulting from difierent ratios of oil,difierent kinds or concentratiohs of salts in water,and difierent pH values.It is concluded that the interfacial tension changes regularly,corresponding to the regular molecular parameters of the vacuum residual fractions.
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