Hydroxylamine trisulfonate

Hydroxylamine trisulfonates, e.g. (K03S)0N-(S03K)2 are made by the reaction of K2SO3 with potassium nitrosodisulfonate (Fremy s salt). Acidification of the product results in rapid hydrolysis to the 0,A-disulfonate which can be isolated as the exclusive product ... 

The use of these equations to analyse calorimetric data has been demonstrated using a model reaction, the acid catalyzed hydrolysis of potassium hydroxylamine trisulfonate (9,10), which reacts according to the following model (Scheme 1). 

Table 5 Rate constant values for the acid catalyzed hydrolysis of potassium hydroxylamine trisulfonate (at an acid concentration of 0.005 M) determined from microcalorimetric data (9)...

Aminedisulfonate can also be formed through the hydrolysis of hydroxylamine trisulfonate ... 

HN02 z=f=r ho3sno (HO S) NIOH J (ho3s) 3n Nitrous acid Nitrososulfonic Hydroxylamine Amine trisulfonic acid disulfonic acid acid... 

Further sulfonation to produce hydroxylamine disulfonate and amine trisulfonate. These sulfonates can hydrolyze to form sulfuric acid and reduced nitrogen species. The latter can undergo further reaction with bisulfite and nitrite. 

Nitrous acid Nitrososulfonic Hydroxylamine Amine trisulfonic... 

Sulfur dioxide or bisulfites are rarely used in combination with nitrites, because their reactions in acidic media yield sulfonates of either hydroxylamine or ammonia, which destroys the preservative activity of the individual additives. The reaction of alkali metal nitrites with bisulfite at lower temperatures leads to the formation of hydroxylamine N, JV-disulfonate, H0N(S03)2, which is hydrolysed to hydroxylamine JV-sulfonate, HONHSOj and further to hydroxylamine (H2NOH). At elevated temperatures complete substitution proceeds with the formation of ammonia JV-trisulfonate, N(S03)j , which is hydrolysed to sulfa-mate, H2NSOj . Subsequent reaction of sulfamate with nitrous acid leads to production of bisulfate ion and nitrogen gas ... 

---