Spectroscopic determination of the critical temperatures and pressures of H2O, CO2, and C2H5OH

被引：2

作者：

Sekiguchi, Chizu ^{[1
]}

Hirano, Nobuo ^{[1
]}

Okamoto, Atsushi ^{[1
]}

Tsuchiya, Noriyoshi ^{[1
]}

机构：

[1] Tohoku Univ, Grad Sch Environm Studies, Aoba Ku, Sendai, Miyagi 9808579, Japan

来源：

JOURNAL OF MINERALOGICAL AND PETROLOGICAL SCIENCES | 2013年 / 108卷 / 06期

基金：

日本学术振兴会;

关键词：

Critical point; Supercritical fluid; Spectroscopic measurement; Hydrothermal experiment; Geofluids; EQUATION-OF-STATE; KAKKONDA GEOTHERMAL SYSTEM; MOLECULAR-DYNAMICS; FLUID; H2O-CO2; WATER;

D O I：

10.2465/jmps.130620b

中图分类号：

P57 [矿物学];

学科分类号：

070901 ;

摘要：

The transmittance of 500-800 nm light was shown to change significantly at the critical points of three pure fluids. Spectroscopic measurements of H2O, CO2, and C2H5OH were made in a visible-type autoclave at high temperature and pressure. Each fluid showed significantly decreased transmittance as its critical point was approached; transmittance reached a local minimum at the critical temperature and pressure. The experimentally determined critical temperature and pressure of H2O are 374 degrees C and 22.07-22.09 MPa, respectively, similar to reference values of 374.15 degrees C and 22.12 MPa; C2H5OH showed values of 243 degrees C and 6.30-6.31 MPa (versus reference values of 241 +/- 7 and 243.4 degrees C and 6.3 +/- 0.4 and 6.14 MPa); and CO2 showed values of 32 degrees C and 7.36-7.43 MPa (versus reference values of 31.04 +/- 0.2 degrees C and 7.37 +/- 0.04 MPa). The good agreement between the experimental results and the reference values indicates that the spectroscopic method used here could be applied to other fluids, including mixed geofluids.

引用

页码：356 / 361

页数：6

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