Carbon deposition from acetone

Table III - The Effect of Sulphiding Upon Carbon Deposition from Acetone on Oxidised 20/25/Nb Stainless Steel...

TABLE VII - Influence of Continuous Addition of Thiophene to the Gas Phase upon Carbon Deposition from Acetone Decomposition on Fe O at 600°C... 

Two possible complementary mechanisms were responsible for the reduction, or in some circumstances complete inhibition, by sulphur of carbon deposition from acetone on Fe30. The first was operative on material sulphided before exposure to acetone, and possibly also when high partial pressures of hydrogen sulphide and sulphur dioxide were added continuously to the gas phase, as this also resulted in appreciable Fej-jjS formation. In these instances reduced deposition could be attributed, at least partly, to a slower rate of formation of the reaction intermediary, e.g. iron carbides, on Fej NS as compared with Fe30. ... 

The influence of benzylidene acetone on the electrodeposition mechanism of Zn-Co alloy was investigated [436]. A relationship between corrosion resistance, microstructure, and cobalt content in Zn-Co alloys was investigated [437] using X-ray photoelectron spectroscopy (XPS) and Auger spectroscopy [438]. The role of vitreous carbon, copper, and nickel substrates in Zn-Co deposition from chloride bath was analyzed [439]. 

Retardation and Inhibition. In order to obtain additional information on the polymerization process, various potential inhibitors or retarding agents were added to carbon suboxide, and the rate of polymer deposition from the gas phase was quantitatively studied at 100°C. To the monomer at a pressure of 330 mm Hg was added either an equimolar quantity of inhibitor based on pressure measurements, or room temperature vapor pressure of additive if less than 330 mm Hg. The additives used were oxygen, nitric oxide, 3-methyl-1-butene, 1,3-butadiene, acetone and acetaldehyde. Polymerization rates were followed by ESR measurements. 

The carbon-containing catalyst was treated by ultra-sound (US) in acetone at different conditions. The power of US treatment, and the time and regime (constant or pulsed), were varied. Even the weakest treatments made it possible to extract the nanotubules from the catalyst. With the increase of the time and the power of treatment the amount of extracted carbon increased. However, we noticed limitations of this method of purification. The quantity of carbon species separated from the substrate was no more than 10% from all deposited carbon after the most powerful treatment. Moreover, the increase of power led to the partial destruction of silica grains, which were then extracted with the tubules. As a result, even in the optimal conditions the final product was never completely free of silica (Fig. 12). 

Cyclonite is a white crystalline solid, m.p. 202°. It is insoluble in water, alcohol, ether, ethyl acetate, petroleum ether, and carbon tetrachloride, very slightly soluble in hot benzene, and soluble 1 part in about 135 parts of boiling xylene. It is readily soluble in hot aniline, phenol, ethyl benzoate, and nitrobenzene, from all of which it crystallizes in needles. It is moderately soluble in hot acetone, about 1 part in 8, and is conveniently recrystallized from this solvent from which it is deposited in beautiful, transparent, sparkling prisms. It dissolves very slowly in cold concentrated sulfuric acid, and the solution decomposes on standing. It dissolves readily in warm nitric acid (1.42 or stronger) and separates only partially again when the liquid is cooled. The chemical reactions of cyclonite indicate that the cyclotrimethylenetri-nitramine formula which Herz suggested for it is probably correct. 

Mercury bis-a-acetyl-a-isopropyl or Mercury-bis-aceto-di-methyl-methane, [CHgCO.CMeg—JgHg.—Mercuric dimethyl aceto-acetate is heated in a vacuum at 90 C., when it is found to lose two molecular equivalents of carbon dioxide, which is shown by the loss in weight. The resulting mass is extracted with acetone, and the solvent removed m vacuo, the product isolated melting at 120 C. It is soluble in acetone, alcohol, toluene, or xylene, but only slightly soluble in ether. Mercuric sulphide is split off from it by the action of ammonium sulphide, but no mercuric oxide is formed when sodium hydroxide is added. The compound soon decomposes with the deposition of metallic mercury. 

Thallium diethyl trinitro-a naphthoxide is deposited in orange plates from aqueous solution, these sintering at 213° C. and melting with decomposition at 220° C. It is completely soluble in cold pyridine or acetone and hot ethyl acetate, moderately soluble in alcohol or ether, less so in chloroform or toluene, and insoluble in light petroleum or carbon tetrachloride. 

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