超臨界SF_6に対するアルカン類の拡散係数のテイラー拡散法による測定

概要

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An apparatus for the measurement of the diffusion coefficient of supercritical fluid has been constructed based on the Taylor dispersion method. The apparatus uses a 1. 2m-long straight capillary tube for the diffusion tube and a position-sensitive detector with a He-Ne laser in order to detect the solute concentration. The diffusion coefficients of the benzene-SF_6 system and alkane(C_6H_<14>-C_<14>H_<30>)-SF_6 systems have been measured at 303. 15-333. 15K and 4. 5-9 MPa. The accuracy of the present results was estimated to be ± 3%. In the results for benzene, it was found that the experimental data of Kopner et al. by the Taylor dispersion method, which had a 96. 66m-long diffusion tube, were consistent with the present values. For C_6H_<14>-C_<14>H_<30>, the temperature dependence was found to be positive and concave near the critical point. The molecular-weight dependence of the diffusion coefficients was negative and convex, and the diffusion coefficient of C_6H_<14> was about two times as large as that of C_<14>H_<30> at the same conditions.
一般社団法人日本機械学会の論文
1993-02-25