Solubility of the potassium salts of nitrogen-sulfur compounds in aqueous solution

Regeneration of Flue Gas Desulfurization Waste Liquors: Precipitation and Hydrolysis of Nitrogen-Sulfur Compounds

“…Hydroxylaminesulfonic acids react with abundant bisulfite ions and are converted to ADS (Littlejohn and Chang, 1990). In addition, potassium salts of hydroxylaminesulfonic acids have higher solubilities than KADS (Littlejohn and Chang, 1991b). Therefore, KADS seems to be the major N-S compound in the potassium salt precipitate.…”

“…The most probable precipitate will be KADS. KADS has low solubility in aqueous solution (Littlejohn and Chang, 1991b;Diverse and Haga, 1892). Although KATS is more insoluble in aqueous solution than KADS, ATS is unstable in acidic environments and readily decomposes to ADS (Chang et al, 1982; Geissler and van Eldik, 1992).…”

“…There, N-S compounds are precipitated after being converted to potassium salts by a metathetical reaction with potassium sulfate. Use of potassium sulfate has been suggested from the fact that the potassium salts of N-S compounds possess lower solubility in aqueous solution compared to other types of metal salts (Chang, 1986;Sada et al, 1988;Littlejohn and Chang, 1991b). The precipitated potassium salts of the N-S compounds are then filtered while the scrubbing liquor is recycled to the main scrubbing liquor stream.…”

Production of ammonium sulfate fertilizer from FGD waste liquors. Quarterly technical report, October 1, 1994--December 31, 1994

“…The hydrolysis of N-S containing compounds has been discussed by several authors (Littlejohn and Chang, 1991;Chang et. al., 1982;Nickless, 1968).…”