Nitrosyl sulfuric acid

For weakly basic amines, ie, those containing several electron-withdrawing groups, nitrosyl sulfuric acid (NO HSO is used as the nitrosating species in sulfuric acid, which may be diluted with phosphoric, acetic, or propionic acid. [Pg.273]

The resulting acid is then converted to caprolactam through a reaction with nitrosyl-sulfuric acid ... [Pg.287]

A quantitative determination of a heteroaromatic diazotization equilibrium has been made only recently. Diener et al. (1989) determined the equilibrium concentrations of thiazole-2-diazonium ion in diazotization of 2-aminothiazole with nitrosyl sulfuric acid in 70% H2SO4. The two reagents were applied in equimolar concentrations of 0.001, 0.01 and 0.1 m. If the concentration ratios (RNJ)oo/(RNH2) = r are... [Pg.63]

Kel-Chlor [Kellogg Chlorine] A non-catalytic version of the Deacon process for making chlorine by oxidizing hydrochloric acid, in which nitrosyl sulfuric acid and nitrosyl chloride are intermediates and concentrated sulfuric acid is used as a dehydrating agent ... [Pg.152]

This, on treatment with sulfuric acid, then undergoes the Beckmann rearrangement to caprolactam. The nitrosyl chloride is made by reacting nitrosyl sulfuric acid (made from oxides of nitrogen and sulfuric acid) with hydrogen chloride gas ... [Pg.212]

Also, nitrosyl chloride is produced by the action of chlorine on sodium nitrate or by the reaction of nitrosyl sulfuric acid with hydrochloric acid ... [Pg.657]

For weakly basic amines, i.e. anilines with poly nitro groups, e.g. 2, 4,-dintro-6-bromoaniline, and also most heterocyclic amines, an alternative method must be adopted using nitrosylsulfuric acid. This diazotising medium can be made by dissolving sodium nitrite in concentrated sulfuric acid, but is also available preformed from chemical suppliers. The weakly basic amine is added gradually to the nitrosyl-sulfuric acid with cooling, and after reaction is complete the mixture is poured into ice and water to give a solution of the diazonium salt. [Pg.89]

Burley, J. D., and H. S. Johnston, Nitrosyl Sulfuric Acid and Stratospheric Aerosols, Geophys. Res. Lett., 19, 1363-1366 (1992a). [Pg.710]

Nitrogen Trioxide (N O ) especially useful for organic nitrosations and the in situ manufacture of nitrosyl sulfuric acid and sodium nitrite. Also used as an oxidizing agent. [Pg.71]

If the nitrosyl-sulfuric acid content is high (more than 1%) as determined by permanganate (see further) add another 1 ml of water and evaporate again... [Pg.717]

The total acidity as H2S04 the total sulfuric as H2S04, and the nitrosyl-sulfuric acid having been determined by titration, the HNOg and H O are calculated by difference Assume ... [Pg.718]

In order to find the actual H2S04and the actual HNOs it is necessary to deduct from the above values the sulfuric and nitric acids equivalents in the nitrosyl-sulfuric acid... [Pg.718]

Note Nitric acid in oleum can also be detd by nitrometer method, which gives TNN Abbreviations AN—actual nitric (unbound acid which actually participates in nitration), ANN-.actual nitric as nitric, ANS- actual nitric as sulfuric,N-so—nitroso(nitrosyl-sulfuric acid, HNOS04), AS—actual sulfuric,... [Pg.90]

With the screw clamp open, the pyrites is gently heated with a wing burner in a slow stream of air drawn in by the aspirator. The clamp is then partially closed so that air also passes through the capillary into the nitric add. The pyrites may now be heated more strongly the current of air through the nitric add is adjusted by means of the clamp so that red fumes of nitrogen oxides are always present in the bottle or chamber, If not enough vapor of nitric acid is provided, colorless crystals of nitrosyl sulfuric acid ( chamber crystals ) will form on the walls of the bottle. [Pg.156]

Caprolactam is also manufactured from toluene (Fig. 2) by oxidation of toluene (with air) to benzoic acid at 160°C and 10 atm pressure. The benzoic acid is then hydrogenated under pressure (16 atm) and 170°C in a series of continuous stirred tank reactors. The cyclohexane carboxylic acid is blended with oleum and fed to a multistage reactor, where it is converted to caprolactam by reaction with nitrosyl sulfuric acid. [Pg.140]

In a new process proposed by Kellogg the oxidation of HCI makes use of nitrosyl-sulfuric acid (HNSOs) at 4 bar and 260-320 °C [9], The amount of byproducts diminishes drastically raising the overall yield over 98%. The gaseous emissions are reduced practically to zero. Chlorinated waste from other processes may be incinerated to HCI, and in this way recycled to the manufacturing of VCM. The process is safer because the contact of hydrocarbon mixtures with oxygen is eliminated. A capital cost reduction of 15% may be estimated compared with the oxy-chlorination process. [Pg.204]

After the evaporation, in order to decompose the nitrosyl-sulfuric acid always present in commercial mixed acids, wash down the sides of... [Pg.717]

One of the least expensive and popular techniques for the quant detn of bound N in energetic materials is that of titrimetry. There are currently three basic titrimetry systems used aq acid-base, redox and non-aqueous (involving both acid-base and redox systems in which there is association, not ionization of the re-actants). The simple aq acid-base titrimetry system has been shown, earlier in the article, being used in the Kjeldahl, Devarda and Ter-Meulen procedures to detn liberated NH3. It is also utilized, for example, to detn nitrosyl-sulfuric acid in mixed acids, total acidity in nitric acid, NG in expl oils, and the N content of... [Pg.302]

II was diazotized with nitrosyl sulfuric acid or sodium nitrite in aqueous solution of acetic acid or... [Pg.198]

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