The dissociation constant and acid hydrolysis rate of hydroxysulfamic acid

Abstract

The acid dissociation constant and hydrolysis rate of hydroxysulfamic acid (HSA) in acid aqueous solutions have been studied. The acid dissociation constant was determined to be K = 1.5 ± 0.5 M at 298 K. The hydrolysis rate, R, was found to be R = k[H+][HSA], where k = 6.2 × 1012 exp (−26 300/RT) M−1 s−1 at (μ = 1.0 M and [HSA] is the concentration of all forms of hydroxysulfamic acid. Keywords: hydroxysulfamic acid, hydrolysis, acid dissociation.

Oxidative Decomposition of Nitrogen-Sulfur Oxides

“…These include hydroxyimidodisulfate (also referred to hydroxylaminedisulfonate, HIDS, or HADS), hydroxysulfamate (hydroxylaminemonosulfonate, HSA, or HAMS), nitridotrisulfate (aminetrisulfonate, NTS, or ATS), and imidodisulfate (aminedisulfonate, IDS, or ADS) (Chang et al, 1982). Hydroxylamine and sulfamate are formed by hydrolysis of HAMS and ADS, respectively (Littlejohn et al, 1989; Doyle and Davidson, 1949). The chemistry associated with these compounds is fairly complex, as shown in Figure 1, and has been described previously.…”

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

“…ADS is hydrolyzed irreversibly and quantatively to yield sulfamate as follows (Doyle and Davidson, 1949;). HN(S03)22-+ H20 ^H2N(S03)-+ HS04- (2) Sulfamate is known to undergo hydrolysis to form ammonium and sulfate ions by a mechanism involving a preequilibrium between sulfamate ion and sulfamic acid, followed by slow hydrolysis of the acid (Maron and Berens, 1950; Candlin and Wilkins, 1960; Hughes and Lusty, 1977;Littlejohn et al, 1989): H2N(S03)-+ H+ ^H2N(S03)H…”

“…Hydrolysis of N-S compounds to ammonium sulfate is an acid-catalyzed reaction (Chang et al, 1982;Nickless, 1968;Littlejohn et al, ,1989). Thus we investigated the effect of sulfuric acid concentration on hydrolysis of precipitated N-S compounds and presented the results in Figure 6.…”

“…Current understanding of reaction pathways suggests that a possible end product of the hydrolysis of N-S compounds is NH4+, which can be recovered as (NH4)2S04 along with regenerated K2S04. Hydrolysis of N-S compounds is known as an acid-catalyzed reaction (Nickless, 1968;Chang et al, 1982;Littlejohn et al, ,1989, so sulfuric acid is added to the hydrolyzer as a catalyst. After completion of the hydrolysis, the hydrolyzed solution is processed through posttreatment stages of cooling/evaporation, neutralization, etc.…”

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

“…Hydroxylamine and sulfamate are formed by hydrolysis of HAMS and ADS, respectively (Littlejohn et al, 1989;Doyle and Davidson, 1949). The reaction sequence for the nitrogen-sulfur compounds is shown in Fig.…”