Tracer diffusion coefficients of benzene in dense CO, at 313.2 K and 8.5-30 MPa
Tracer diffusion coefficients of benzene in dense CO, at 313.2 K and 8.5-30 MPa
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DOI：
10.1016/s0378-3812(96)03084-1
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发表时间：
1996-10-15
影响因子：
2.6
通讯作者：
Nishimoto, N
中科院分区：
文献类型：
--
作者：
Funazukuri, T;Nishimoto, N
用泰勒色散法测定了苯在二氧化碳中无限稀释时的二元扩散系数D ~（12），温度为313.2K，压力为8.5 ~ 30 MPa。在313.2 K时，本研究中的测量值略高于Swaid和Schneider，1979年的测量值，低于Sassiat等人的测量值，1987.发现螺旋扩散柱垂直安装时测得的D-12值低于水平安装时测得的D-12值。D-12与溶剂粘度的相关性对于苯的D-12是有效的，无论是在浓CO2中还是在液体溶剂：己烷、环己烷和十二烷中。此外，所测得的D-12随压力的增加而平稳地下降，并且在313.2K下在8.5至30 MPa的压力范围内没有证据表明D-12的异常下降。
Binary diffusion coefficients D-12 of benzene at infinite dilution in carbon dioxide were measured at 313.2 K in the pressure range from 8.5 to 30 MPa by the Taylor dispersion method. At 313.2 K, the measured values in this study were slightly higher than those of Swaid and Schneider, 1979, and lower than those of Sassiat et al., 1987. It was found that the D-12 values measured with the coiled diffusion column installed vertically were lower than those when it was installed horizontally. The correlation of D-12 with solvent viscosity was effective for the D-12 of benzene, both in dense CO2 and in the liquid solvents: hexane, cyclohexane and dodecane. In addition, the measured D-12 decreased smoothly with increasing pressure, and there was no evidence of the anomalous decrease in D-12 at 313.2 K in the pressure range from 8.5 to 30 MPa.