Acid continued nitrous

The problem of defining the nature of species present in solutions of nitrous acid in moderately concentrated mineral acids continues to attract... 

The reactants are fed separately iato a stUl, from which the product is continuously removed by distillation (qv) (31). Isopropyl nitrate is a valuable engiae-starter fuel and can be used ia explosives (see Explosives and propellants) (32). The nitrite ester, isopropyl nitrite, can be prepared from the reaction of isopropyl alcohol and either nitrosyl chloride or nitrous acid at ambient temperature (33). The ester is used as a jet engine propellant (30). 

A. o-Bromobenzenediazonium hexafluorophosphate. A solution of 95 ml. of 12N hydrocMoric acid in 650 ml. of water is added with stirring to 60 g. of o-bromoaniline (0.35 mole Note 1) in a 2-1. three-necked flask equipped with stirrer and thermometer. Solution is effected by heating the mixture on a steam bath (Note 2). A solution of 29 g. (0.42 mole) of sodium nitrite in 75 ml. of water is added with stirring while the mixture is maintained at — 5° to —10° by means of a bath of ice and salt or of dry ice and acetone. At the end of the addition there is an excess of nitrous acid, which can be detected with starch iodide paper. Seventy-four milliliters (134 g., 0.60 mole) of 65% hexafluorophosphoric acid (Note 3) is added in one portion, with vigorous stirring, to the cold solution of the diazonium salt. Cooling and slow stirring are continued for an additional 30 minutes, and the precipitated diazonium hexafluorophosphate is then collected on a Bilchner funnel. The diazonium salt is washed on the funnel with 300 ml. of cold water and with a solution of 80 ml. of methanol in 320 ml. 

William Lewis stated m 1759 that the ash of bones and horn resembles chalk and the earth of the shells of sea-fishes. .. in being easily soluble m nitrous [nitric], marine, and vegetable acids, and not in the vitriolic." The only difference he was able to observe between the calcareous earth from shells and the bone ash was that the latter is not changeable by fire into Lime How strongly soever the earth of Bones and Horns be calcined, it continues insipid and gives no manifest impregnation to water (39). 

Febo, A., C. Perrino, M. Gherardi, and R. Sparapani, Evaluation of a High-Purity and High-Stability Continuous Generation System for Nitrous Acid, Environ. Sci. Technol., 29, 2390-2395 (1995). 

Kanda, Y., and M. Taira, Chemiluminescent Method for Continuous Monitoring of Nitrous Acid in Ambient Air, Anal. Chem., 62, 2084-2087 (1990). 

The SH-process involves continuous nitration of hexamethylenetetramine by concentrated nitric acid, with the production of nitrous gas. The RDX is filtered from the residual acid and stabilized by boiling in water under pressure and purified by recrystallization from acetone. 

Nitro-N-nitroso-3 -chloro-N-methylaniline or f 2-Nitro-5 -chlorophenyl)-methylni trosamine, (02N)C1.C6H3.N(N0).CH3, brn prisms(from hot ale), mp 67.5-68.5 was prepd by continued action of nitrous acid on an ale soln of... 

The spontaneous decomposition of nitrocellulose in the air produces nitrous and nitric acids which promote a further decomposition. If these products however are removed continuously, the uncatalyzed decomposition is extremely slow, and smokeless pow-... 

---