High-nitrogen solids

Solvent extraction can also be achieved under milder conditions but the product may be a high-nitrogen solid or a heavy oil with only low yields of light oils and gases. The more severe conditions are more effective for sulfur and nitrogen removal to produce a lighter liquid product that is more amenable to downstream processing. 

Prediction of Properties of High-Nitrogen Solids (Neutrals, Ionics). 157... 

Fig. 2.15 Isosteric heat of adsorption of nitrogen on molecular (low-evergy) solids and on carbons (high-energy solids), plotted as a function of i/n . (A) Diamond (B) gruphitized carbon black. P.33 (D) Benzene (E) Teflon. The curve for amorphous carbon was very close to Curve (A). (Redrawn from a Figure of Adamson . )...

The degree of uncertainty of 10 per cent or more, inseparable from estimates of specific surface from adsorption isotherms, even those of nitrogen, may seem disappointing. In fact, however, attainment of this level of accuracy is a notable achievement in a field where, prior to the development of the BET method, even the order of magnitude of the specific surface of highly disperse solids was in doubt. The adsorption method still provides the only means of determining the specific surface of a mass of non-... 

The solid base decomposes violently in contact with cone. acid. See other high-nitrogen compounds, organic bases... 

All the well-characterized 1,2,3-triazine derivatives are stable, high-melting solids. The 4,5,6-triaryl derivatives show UV maxima in the range 259-286 nm (log e = 4.09-4.42), 4,5-diphenyl-1,2,3-triazine has Amai at 251 nm, while the 4,5,6-trimethyl derivative shows two maxima at 217 nm (log e — 3.63) and 278 nm (log e = 2.79). Mass spectral studies indicate that fragmentation takes place in an identical fasMon to that observed during photochemical decomposition, i.e., with production of acetylenes, nitriles, and nitrogen. ... 

Some nitric acid is used for the manufacture of explosives and chemicals, but much is converted on-site to the potentially explosive high nitrogen fertilizer ammonium nitrate (Section 2.11). Ammonia gas from the Haber plant is absorbed in aqueous HN03, and the NH4N03 solution is evaporated to a liquid melt (< 8% H20) for crystallization, but care must be taken to keep the pH of the solution above about 4.5 and to exclude any material (chlorides, organic compounds, metals) that might catalyze the explosive decomposition of NH4N03. It is also wise to keep the melt mass low and to vent it to avoid pressure buildup. The solid product should be stored well away from the main plant. 

The crystal structure of the complex formed between carboxypeptidase Aa (abbreviated CPA) and glycyltyrosine (Gly-Tyr) has been refined to 2.0 A by Lipscomb et at. (444, 445) and it reveals (Fig. 90) interactions between the amide carbonyl oxygen and the catalytically essential Zn, and between the amide nitrogen and the hydroxyl of tyrosine-248 (Tyr-248). Scott et al. (443) synthesized both the [13C]amido (90% enriched) and amido[l3C, 15N]amido (90% and 99% enriched, respectively) isotopomers of Gly-Tyr. They then proceeded to probe the hydrolysis by a series of l3C and l5N high-resolution solid-state NMR spectra. 

Jr, "The Viscosity of High-Nitrogen Nitrocellulose , Paper presented at the Army -Navy Solid Propellant Group, 111 Inst of Technology, Chicago, 111(19 April, 1948) 179)H. 

Mixed with additives, urea is used in solid fertilizers of various formulations, eg, urea—ammonium phosphate (UAP), urea—ammonium sulfate (UAS), and urea—phosphate (urea + phosphoric acid). Concentrated solutions of urea and ammonium nitrate (UAN) solutions (80—85 wt%) have a high nitrogen content but low crystallization point, suitable for easy transportation, pipeline distribution, and direct spray application. 

The high resolution solid-state 13C NMR spectrum of the HMDA network observed at 80 °C leads to separate lines for the various aliphatic carbons DGEBA methyl carbons, HMDA methylene carbon in the p or y position with respect to the nitrogen atom, CH2 (of the hydroxypropyl ether) directly bonded to the nitrogen, and the CHOH - CH2 - O unit. For the aromatic... 

This explosive solid may be produced during preparation of cyanogen azide. See other CYANO COMPOUNDS, HIGH-NITROGEN COMPOUNDS, ORGANIC AZIDES... 

Many molecules with a high nitrogen content are potentially explosive. Low molecular weight aryl azides are generally stable but as undiluted solids or liquids they should be handled with respect, especially if they are prepared in gram amounts. For example, distillations should be done under... 

This experiment is concerned with the multilayer physical adsorption of a gas (the adsorbate) on a high-area solid (the adsorbent). Since such adsorption is caused by forces very similar to those that cause the condensation of a gas to a bulk liquid, appreciable adsorption occurs only at temperatures near the boiling point of the adsorbate. The adsorption of N2 gas on a high-area solid will be studied at 77.4 K (the boihng point of liquid nitrogen), and the surface area of the solid will be obtained. 

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