| Abstract: | Vapor-liquid relations (P-T-x) for the system NaCl-H2O were determined experimentally at temperatures spanning the critical temperature of water (Tc), the lowest temperature in the system at which critical behavior occurs. In addition, vapor-liquid-halite P-T-x(vapor) relations were determined from 300?? to 500??C. Results show that at 373.0??C, immediately below Tc, the vapor side of the isothermal vaporliquid P-x boundary has a shape quite different from that previously conceived. The NaCl content of the vapor increases with pressure in a smooth manner from the pressure of the three-phase assemblage (135 bars, 0.0029% NaCl), to a pressure just below that of the vapor pressure of pure water (0.012% NaCl at 184 bars). Above this pressure the boundary abruptly reverses and projects asymptotically to 0% NaCl in a beak-like shape at 218 bars, the vapor pressure of pure water. At 375.5??, slightly above Tc, the asymptote disappears, and is replaced by a rounded nose. At progressively higher temperatures, the nose disappears and by 380??C the familiar symmetrical bell-shaped curve predominates with the critical point defined by the top of the bell. The P-T curve of the three-phase assemblage determined in the present study is in agreement with previous workers. The NaCl content of the three-phase vapor, however, is much higher than some literature values at temperatures above 410??C. ?? 1986. |
| Genre: | Article |
| ProdID: | 70015718 |
| Citation Author: | Bischoff, J. L.; Rosenbauer, R. J.; Pitzer, K. S. |
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| Citation End Page: | 1444 |
| Citation Issue: | 7 |
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| Citation Language: | English |
| Citation Larger Work Title: | Geochimica et Cosmochimica Acta |
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| Citation Number Of Pages: | 8 |
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| Citation Search Results Text: | The system NaCl-H2O: Relations of vapor-liquid near the critical temperature of water and of vapor-liquid-halite from 300?? to 500??C; 1986; Article; Journal; Geochimica et Cosmochimica Acta; Bischoff, J. L.; Rosenbauer, R. J.; Pitzer, K. S. |
| Citation Start Page: | 1437 |
| Citation Volume: | 50 |
| Citation Year: | 1986 |
| Type: | citation/reference |
| Text: | The system NaCl-H2O: Relations of vapor-liquid near the critical temperature of water and of vapor-liquid-halite from 300?? to 500??C; 1986; Article; Journal; Geochimica et Cosmochimica Acta; Bischoff, J. L.; Rosenbauer, R. J.; Pitzer, K. S. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Wed, 1 Jan 1986 00:00 -0600 |
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