Determination of thermodynamic parameters of water-dissolved complexes at T < 360oC with the help of Raman spectroscopy: methods and equipment

摘要

For the first time the Raman spectrometric study for determination Gibbs free energy of the formation $Delta@G$- f$/ and Henry's constant in high-temperature water solution was used. We studied the system S$-1q$/-H$-2$/O at 200-360 degrees C and the pressure of the saturated water vapor. The values $Delta@G$-f$/ as a function of temperature for the aqueous species H$-2$/S$-(aq)$/, SO$-2(aq)$/ and S$-8(aq)$/ were calculated after determination of the equilibria constant between species of the system. We determined 8-term ring molecules S$-8(aq)$/ as the predominant species of the elementary sulfur in a water solution. The quantitative data were obtained using the Raman intensity of the strength vibration of water as the internal standard. The design of the autoclave provided the possibility of measuring the distribution of components between liquid and gas for Henry's constant determination.