Experimental study of polysulfane stability in gaseous hydrogen sulfide
- McGill Univ., Montreal, Quebec (Canada). Dept. of Earth and Planetary Sciences
- ETH-Zentrum, Zuerich (Switzerland). Inst. fuer Mineralogie und Petrographie
- Moscow State Univ. (Russian Federation)
The solubility of sulfur in gaseous hydrogen sulfide has been studied in the H{sub 2}S-S system. Experiments were carried out at temperatures between 50 and 290 C and pressures up to 200 bars. The experimentally determined concentrations of sulfur in the gas phase are 6--7 orders of magnitude higher than the corresponding concentrations calculated for a system free of hydrogen sulfide. The results of experiments show significant interaction between S and H{sub 2}S. These interactions can be of two kind: solvation by hydrogen sulfide (solubility), as with formation of new stable gaseous chemical compounds, like polysulfanes (chemical reaction). The data obtained can be reasonably well described by the formation of a H{sub 2}S {center_dot} S compound. Thermodynamic parameters for polysulfanes and equilibrium compositions of the S-H{sub 2}S system have been calculated ab initio for the experimental conditions. At temperatures above 170 C, results (of calculations) are in good agreement with experimental data, although the difference between the calculated and experimental mole fraction of the sulfur in the gas phase reaches 2 orders of magnitude at 125--170 C. It is theorized that sulfur solubility in gaseous H{sub 2}S is related to two main chemical reactions, dominated in the different temperature ranges: sulfur solvation by H{sub 2}S (125--170C) and polysulfane formation (200--290 C).
- OSTI ID:
- 289460
- Journal Information:
- Geochimica et Cosmochimica Acta, Journal Name: Geochimica et Cosmochimica Acta Journal Issue: 15 Vol. 62; ISSN GCACAK; ISSN 0016-7037
- Country of Publication:
- United States
- Language:
- English
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