Vapor Pressure and Solubility of the Sulfuryl Diamide-Ammonium Thiocyanate-Ammonia Systemt

Abstract

Vavpor pressure and solubility of the ternary sulfuryl diamide-ammonium thiocyanateammonia system were investigated at O, 10, and 20C.
The vapor pressure was determined for the Iiquid ammonia solutions of NH2SOaNH NH4SCN mixture having a weight ratio of 3 1, 1 1, and 1 3 and the liquid ammonia solution saturated with respective solid components.
The vapor pressure of liquid ammonia is greatly lowered by the dis olution of NHaSO2NHx and NH4SCN. The liquid ammonia solution saturated with both solid shows the lowest vapor pressur among the ternfic ry solutions, having a vapor pressure of OC, 57 mmHg 10C, 70mmHg 20eC, 90 mmHg.
The solubility isotherms of the system NH2SO2NH2 NH4SCN NHs at O"C, 10"C, and 20"C are found to be simple. The pure NH2SO2NH2 and NH4SCN remains as solid phase. The isothermally invariant ternary solution saturated with both solid has a solubility of 379 g NH2SO2NH2 and 354 g NH4SCN at OC, 472 g NH2SO2NH2 and 419 g NH, SCN at 100C, and 640g NH2SO, NH2 and 510 g NH4SCN at 20"C for 100 g liquid ammonia respectivcly.