Nitrogen Oxides, Absorbent Materials for

Nitramite. See Avigliana 3 A5I6-R Nitrogen Oxides, Absorbent Materials for A5-L... 

Industrial. Nitric acid is itself the starting material for ammonium nitrate, nitroglycerin [55-63-0] trinitrotoluene [118-96-7]., nitroceUulose [9004-70-0] and other nitrogen compounds used in the manufacture of explosives (see Explosives and propellants). Nitric acid is made by oxidation of ammonia to nitrogen dioxide [10102-44-0] which is subsequently absorbed by water. 

The silicone-rubber heart-valve poppets contain unreacted polymer which appears to be absent after the poppet has been exposed to body fluids. When the question was raised as to whether the new poppets contain a material subject to oxidation at a lower temperature than for the bulk of the poppet, nitrogen studies showed decomposition at the same temperature but to a lesser extent. For the new poppets in air a mass loss of about 9% was observed, while for those samples showing an apex at 390 °C, the percent of absorbed material was... 

Dumas introduced the oxidation method in which a mixture of nitrogen-containing organic material and copper oxide is heated in an inert atmosphere to form carbon dioxide, water, and nitrogen. The carbon dioxide is absorbed, the water condensed, and the nitrogen determined volu-metrically. Although the Dumas method has been employed for many years, various modifications have been made to increase the accuracy and the precision. 

As shown in Table II, in the presence of polymer, the enclosed nitrous oxide is completely consumed during irradiation. In the place of nitrous oxide, nitrogen and water are formed. The yield of nitrogen or water corresponds stoichiometrically to the loss of nitrous oxide. A large G value, about 2000, is given for the disappearance of nitrous oxide. Estimation of the G value is based on the assumption that the available energy for the consumption is only that absorbed directly by the gas dissolved in the polymer solid. The G values for the formation of water and nitrogen should be equal to 2000. Moreover, the summation of the amount of the excess formation of crosslinks and unsaturation becomes stoichiometrically almost equal to the loss of nitrous oxide, as shown in Table III. The equation of material balance of nitrous oxide, therefore, should be written as follows ... 

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