Sulfamic acid (other names: aminosulfonic acids, acid amidosulfuric, monoamide sulfuric acid) - the substance, which is a colorless crystals of the rhombic shape.The formula of this compound: NH2SO2OH (or NH2SO3H).Physical properties
aminosulfonic acids:
1. This compound exists in the form of colorless crystals which have a diamond shape.Orthorhombic crystal system: b = 0,8025 nm, a = 0,8037 nm, z = 8, c = 0,9237 nm.In the form of the zwitter ion exists in the crystalline state.
2. Sulfamic acid has the following molecular weight: 97.098 amuThe melting point is 205 degrees, the expansion - 260 degrees Celsius.
3. Solubility in acetone at 25 is 0.04 degrees;in water at 20 degrees 17,57, 40 at 22.77 degrees and 80 degrees - 32.01;in ethyl alcohol at 25 ° C 0,01;formamide at 25 degrees, 0.18;in methanol at 25 0.4 degrees.
4. Has density of 2.126 grams per santimetr³.
Chemical properties of sulfamic acid:
1. When heated to 260 degrees, it decomposes to SO2 (sulfur dioxide ll), SO3 (sulfur oxide lll), N2 (nitrogen) and H2O (water).Here is the response:
NH2SO2OH = SO2 (Auxerre oxide ll) + SO3 (sulfur oxide lll) + N2 (nitrogen is released as gas) + H 2 O (water).
2. At room temperature, this compound hardly hydrolyzed.However, at too high temperatures is hydrolyzed to NH4HSO4.Moreover, in the acidic environment of the reaction rate increases significantly.
3. With a variety of metals, carbonates, hydroxides and oxides of aminosulfonic acid forms a salt NH2SO3M (generic name - sulfamates) with thionyl chloride SOCl2 - NH2SO2Cl sulfamoyl.
4. In conjunction with HNO2 (nitrous acid) is subjected to oxidative deamination - NH2SO3H + HNO2N2O + N2 (nitrogen is released as gas) + H2SO4 (sulfuric acid).This reaction is used to determine the amount of sulfuric acid monoamide and to decompose the excess nitrous acid (HNO2) in the manufacture of azo dyes.
5. Sulphamic acid is oxidised by chlorine (Cl), bromine (Br), potassium permanganate (KMnO4) and sulfuric acid to chlorates (H2SO4) and nitrogen (N2).
6. Reaction of this acid with HClO (hypochlorous acid) or NaClO (sodium hypochlorite) leads to the formation of N, N-dichloro- or N-chloro derivative.The reaction with sodium (Na) in liquid ammonia (NH3) to NaSO3NHNa, sodium sulfate (Na2SO4) to 6HSO3NH2 · 5Na2SO4 · 15N2O.
7. Also monoamide sulfuric acid reacts with primary and secondary alcohols, with phenols.Tertiary, secondary and primary amines to form this acid aminosulfamaty and amides of carboxylic acids - ammonium N-acyl sulfamates.
8. To identify aminosulfonic acid is used reaction with nitrous acid (HNO2) or fusing with benzoin (C14H12O3).
Application sulfuric acid monoamide
1. Chemical industries: cleaning equipment from the beer and milk stone from various mineral deposits (oxide films, hardness, iron compounds).Production of hydrochloric acid in this case becomes disadvantageous as sulfamic less corrosion.
2. At home and on the supply of public enterprises: for the treatment of kitchen utensils and a dining area, a part of some detergents.
3. The raw material for the preparation of certain chemicals, such as herbicides and fire-resistant materials.
4. In electroplating: tin pickling food and to create electrolytes.
5. To remove the mucus from the pools (there are water-cooling systems).
6. When cleaning machines for making paper.
7. When handling the oil wells.
How sulfamic acid should be stored, and what precautions should be taken when using it?
monoamide sulfuric acid refers to the slow-burning substances.According to the degree of influence on the living organism it relates to compounds of the third class of danger.It causes severe burns to skin and mucous membranes.
stores this acid in double plastic bags (capacity of forty kilograms), designed specifically for chemical products.It's worth noting that the product is highly soluble in H2O (water).For prolonged storage caking.
