Effect of nitric acid

Effect of nitric acid on stainless steel and aluminum. 92... 

Fig. 3.24 Inhibiting effect of nitric acid on corrosion of 304SIS steel in sulphuric acid at...

Effect of Nitric Acid-Hexamine Ratio on Initial Rate of Cyclonite Formation at 0 C... 

It is prepd by the action of methylamine on 4-chloro-l-nitrobenzene (Ref 5) by the action of methyl iodide (Ref 6), or methyl sulfate on 4-nit roaniline (Ref 7) or by the hydrolysis of 4-nitro-N-methylformanilide with hot coned aq HC1 (Ref 8). In a study of the effect of nitric acid concn on the prods of the nitration of N,N-dimethylaniline to form Tetryl, it was isolated in low yield by the action of nitric acid, d 1.046g/cc, plus Na nitrite on N,N-dimethylaniline (Ref 10). A eutectic mixt with N-ethyl-4-nitroaniline has been patented as a stabilizer for NC (Ref 12). Studies at NPF indicate that 4-nitro-N-methyl-aniline is superior to Centralite, 2-nitrodiphenyl-amine, or Acardite in stabilizing. NC Refs 1) Beil 12, 586, (295) 1125 ... 

Fig 15 Effect of nitric acid—hexamine ratio on initial rate of cycionite formation at Q°C, according to Vroom and Winkler (Ref 36d)... 

Tetranitromethane is obteiined by the effect of nitric acid on acetic anhydride. A large number of very violent accidents arecaused by the fact that the temperature was not properly monitored. The detonation speeds are very high. 

Methyl nitrate is prepared by the effect of nitric acid on methanol in the presence of sulphuric acid. Operating conditions are critical, given the exothermicity of the reaction and the compound thermal instability (see previous table). Moreover, methyl nitrate is very sensitive to impact. It combusts spontaneously at 250-316°C when it is in the vapour state and even when the vapour is diluted by an inert gas. The flame temperature reaches 2600°C. 

The effect of nitric acid on dimethyl sulphide in the presence of dioxan gives rise to a detonation, even at liquid nitrogen temperatures. There is no factor in this description that can prove whether the accident is related to sulphide or dioxan, which probably gives rise to dangerous reactions with nitric acid. 

Aris R, Christian D, Tager I, et al Effects of nitric acid gas alone or in combination with ozone on healthy volunteers. Am Rev Respir Dis 148 965-73, 1993... 

Fig. 18. Effect of nitric acid-hexamine ratio on final yield of cyclonite in acetic acid, according to Kirsch and Winkler [52],...

Samples were converted to slurries and a 2 factorial design was deployed to study the effects of nitric acid, sample amount and presence of oxygen in the Ar flow... 

The effectiveness of nitric acid as a cocatalyst is probably caused by two factors. One of these is the homolytic scission of the nitric acid molecule (Reaction 7) to produce free radicals which act as initiators (5) (Reaction 1). 

Erlinger, C., Gazeau, D., Zemb, Th. et al. 1998. Effect of nitric acid extraction on phase behavior, microstructure and interactions between primary aggregates in the system dimethyldibutyl-tetradecylmalonamide (DMDBTDMA)/ -dodecane/water A phase analysis and small-angle X-ray scattering (S AXS) characterization study. Solvent Extr. Ion Exch. 16 707-738. 

Fujii, T., Aoki, K., Yamana, H. 2006. Effect of nitric acid distribution on extraction behaviour of trivalent/-elements in a TRUEX system. Solvent Extraction and Ion Exchange 24(3) 347-357. 

In a related study [62], similar effects on conductivity of SWCNTs were reported, but here a comparison was also made between the effects of nitric acid reflux and air plasma treatment, and an attempt was made to relate the changes observed to the creation of defect sites. The authors did not offer a more concrete proposal regarding the nature of the sites involved in these treatments. After the acid treatment, Raman microscopy results indicated a dramatic change in SWNT electronic structure, and both treatments enhanced the electron transfer kinetics for the oxidation of inner-sphere dopamine. By contrast, both treatments had a negligible effect on the voltammetric response of a simple outer-sphere electron-transfer redox process Ru(NH3)63+/2+. ... 

Longerich, H.P. (1989) The effect of nitric acid, acetic acid and ethanol on inductively coupled plasma-mass spectrometric ion signals as a function of nebulizer gas flow, with implications on matrix suppression and enhancements. J. Anal. Atomic Spectroscopy 4, 665-677. 

Effect of Nitric Acid on the Isotopic Exchange Reaction between H2 and HDO(v) over a Hydrophobic Platinum Catalyst... 

Hong et al. examined the effect of nitric acid passivation on type 430 ferritic stainless steel using potentiodynamic polarization, EIS, and Auger electron spectroscopy (AES) (18). Passivation treatments were carried out on wet polished surfaces by immersion for 60 minutes in nitric acid solutions ranging from 1 to 61% at 50°C. Pitting potential and the magnitude of the total impedance were positively correlated with surface Cr concentration. In response to this study,... 

Table 4.63 Effect of nitric acid in sulfuric acid on the corrosion of lead at I I8°C.

Matusiewicz, H. Critical evaluation of the effectiveness of nitric acid oxidizing systems pressurized microwave-assisted digestion procedures. Chem. Anal. (Warsaw) 46, 897-905 (2001)... 

Aravantinos-Zafiris, G. and Qreopoulou, V. 1992. The effect of nitric acid extraction variables of orange pectin, J. Sci. Food Agric., 60 127-129. 

Figure 4.7 Effect of nitric acid concentration on extraction of uranyl nitrate with TBP. (Data of McKay [MI].)...

Figure 10.8 illustrates the effect of nitric acid concentration on distribution coefficients in the Purex process, for 80 percent saturation of the solvent with uranium, a condition that obtains near the feed point. Increasing acid concentration improves separation of ruthenium... 

Figure 10.8 Effect of nitric acid concentration on distribution coefficients in 30 v/o TBP 80 percent saturated with uranium at 25 c. From [S23J.)...

In Table 7, the effect of nitric acid pretreatment at room temperature is illustrated for an OL carbon from Calgon. A 30% converted methyl acetate feed solution was selected for the hydrolysis study. When not treated with nitric acid, the carbon required a contact time between 26 to 52 minutes to reach 40% conversion. When the same carbon is treated with nitric acid, a 42% conversion was reached at a contact time of 12 minutes or less. Dimethyl ether was not observed in either experiment (10,11). The surface acidity was determined by using the Boehm method. The consumed NaHCOa determined the amount of carboxylic groups on the surface of the carbon. The nitric acid treated carbon possessed 6.3 times more carboxylic groups. 

Effect of Nitric Acid. Preliminary experiments showed Incomplete transfer of americium from 7.0M nitric acid through a membrane of undiluted DHDECMP to 0.25M oxalic acid. Danesl et al. ( ) have shown that such membranes also transport nitric acid. Consequently, the nitric acid concentration of the strip solution Increases with time and the driving force of the transfer, the nitrate concentration gradient. Is neutralized. When this occurs, equilibrium Is reached and no further net changes In americium concentration are observed. See Horwltz al. ( ) for the equations describing the chemistry of the extraction. 

Americium, in nitric acid waste, 182 Americium transfer behavior cation exchange of strip solution, 186 effect of feed-to-strip ratio, 186 effect of nitric acid, 185 studied with hollow-fiber membrane, 183 Analytical models, to predict facilitation factors, 12... 

---