Sooty smoke

Chemical Analysis. The presence of siUcones in a sample can be ascertained quaUtatively by burning a small amount of the sample on the tip of a spatula. SiUcones bum with a characteristic sparkly flame and emit a white sooty smoke on combustion. A white ashen residue is often deposited as well. If this residue dissolves and becomes volatile when heated with hydrofluoric acid, it is most likely a siUceous residue (437). Quantitative measurement of total sihcon in a sample is often accompHshed indirectly, by converting the species to siUca or siUcate, followed by deterrnination of the heteropoly blue sihcomolybdate, which absorbs at 800 nm, using atomic spectroscopy or uv spectroscopy (438—443). Pyrolysis gc followed by mass spectroscopic detection of the pyrolysate is a particularly sensitive tool for identifying siUcones (442,443). This technique rehes on the pyrolytic conversion of siUcones to cycHcs, predominantly to [541-05-9] which is readily detected and quantified (eq. 37). 

In our tests, the furnace was occasionally deficient of oxygen. When oxygen level went to zero, a significant amount of CO was produced as well as visible and sooty smoke. These are indications of incomplete combustion. The only product of incomplete combustion monitored was CO. Incomplete combustion products other than CO were not accounted for. 

Nitroethylene Polymer (NEtPol) [H2C CH.N021x mw[73.05la> N 19.17%, OB to COa-7% wh amorphous solid, mp-did not melt, but de-coffipd slowly at 75°, igniting after 2 hours of heating being heated at 100°, it deflagrated with evoln of a brown sooty smoke when placed on a hot plate heated at 200°, it spontaneously decompd without expln. 

No. The few explosions in the Southern Hemisphere I neglected in this study, so I took the targets in the Northern Hemisphere and assumed that they were initially between 30° north and 60° north. Then they started spreading out over the Northern Hemisphere, but in 30 days according to this model did not reach the Southern Hemisphere. In a real case I doubt very much whether that would be the case, probably it would reach the Southern Hemisphere, because the sooty smoke world absorb so much solar energy that the heated atmosphere would move upward and southward much faster than is normally the casi. 

Nitroethylene polymer is a white amorphous solid which does tun melt. According to [6 it decomposed slowly at 75 C. After 2 hours of maintaining this temperature it ignited. Wlien heated to I00 ( it deflagrated with a sooty smoke in 23 min. On a hot plate of 200°C it decomposed without explosion. Tlie sensitivity to impact is of the order of TNT. The strength (in ballistic mortar) constitutes only 29% of that of TNT. Hungarian authors (I5 reported the data for polynitrocthylenc as follows ... 

Cellulose acetate Bums, yellow flame sooty smoke 1.3 7.6... 

Burning a hydrocarbon with insufficient air produces sooty smoke. The soot deposits on the first catalyst bed. To do a thorough job of plugging a bed with this technique takes about eight hours. 

Polyester elastomer is soluble in cresol, concentrated sulfuric acid, and trifluo-roacetic acid. Specific gravity ranges from 1.17 to 1.25. The elastomer burns very slowly with a yellow flame with blue tip. It gives off sooty smoke and a sweet characteristic odor. Infrared spectroscopy and DSC are preferred method for positive identification of the elastomer. 

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