Hydrazinium(2+)-sulfat

BeschreibungHydraziniumsulfat bildet farblose, dicke Tafeln oder Prismen mit einem Schmelzpunkt von 254 ℃. Die Kristalle sind in kalten Wasser schwer löslich (3.05 g in 100 ml bei 22 ℃), in heißem Wasser unter Hydrolyse zu N2H5+ und H3O+ leicht löslich und in Ethanol unlöslich. Hydraziniumsulfat wird als Reduktionsmittel bei der Mineralanalyse, zur Trennung von Polonium und Tellur, in der Photographie zur Beschleunigung des Entwickelns, als Fungizid und zur Herstellung von Aziden verwendet.

VerwendenHydrazine sulfate is used in the gravimetric estimation of nickel, cobalt and cadmium; in the refining of rare metals; as an antioxidant in soldering flux for light metals; as a reducing agent in the analysis of minerals and slags; in separating polonium from tellurium; in tests for blood; for destroying fungi and molds; in the preparation of hydrazine hydrate; press ure stabilizer in cutting oils.

synthetischeHydrazine sulfate may be synthesized from aqueous ammonia and sodium hypochlorite solution in a two-step process. In the first stage, aqueous solution of ammonia is boiled with a normal solution of sodium hypochlorite in the presence of 10% gelatin solution to yield hydrazine. In the second stage, the hydrazine solution is ice-cooled followed by slow addition of concentrated sulfuric acid (Adams, R., and B.K. Brown. 1964. In Organic Synthesis, Collective Volume I, ed. H. Gilman and A. H. Blatt, 2nd ed. pp 309-310, New York: John Wiley & Sons). The reaction steps are as follows: 2NH3 + NaOCl → NH2NH2 + H2O + NaCl NH2NH2 + H2SO4 → NH2NH2 •H2SO4