烃-水/盐水体系高压界面张力的测定与关联

Measurement and Correlation of High Pressure Interfacial Tension for n Alkane Water/Brine Systems

应用ＪＥＦＲＩ悬滴式界面张力仪，在１—３０ＭＰａ压力范围内，测定了２５℃、５０℃下６种正构烷烃与水及无机盐水溶液间的高压界面张力。在改进Ｎａｋａｈａｒａ－Ａｒａｉ关联式的基础上，根据试验得到的界面张力压力系数，提出了计算烃－水／盐水体系高压界面张力的方程。对１５０个数据点的考核表明：与试验值相比，平均相对误差仅为０．６７％。

Interfacial tension of normal alkane water/brine systems was measured in the temperature and pressure ranges of 25 to 50℃ and 1 to 30 MPa using the pendent drop technique On the basis of the modified Nakahara Arai correlation and pressure coefficients of interfacial tension obtained from experiments,an equation was put forward to predict the interfacial tension of n alkane water/brine systems under high pressure The comparision between the calculated and experimental values showed that the average relative error for 150 data was only 0 67%