Decomposition products ethane

H. Bockborn and co-workers, "Production of Acetylene ia Premixed Flames and of Acetylene—Ethylene Mixtures," Chem. Ing. Pechnol. 44(14), 869 (1972). "Thermal Decomposition of Ethane ia a Plasma Jet," Rogyo Kagaku Zasshil4(9), 83 (1971). 

The decomposition of ethane has been extensively studied and several mechanisms have been postulated. The main products of the reaction are ethylene, C2F14, and hydrogen, Hj. However, there are small amounts of methane, CH4, butane, and other products. 

Polyethylene displays good heat resistance in the absence of oxygen in vacuum or in an inert gas atmosphere, up to the temperature of 290°C. Higher temperature brings about the molecular-chain scission followed by a drop in the molecular-weight average. At temperatures in excess of 360°C the formation of volatile decomposition products can be observed. The main components are as follows ethane, propane, -butane, n-pentane, propylene, butenes and pentenes [7]. 

The presence of methane in the decomposition products together with the fifty per cent of carbon monoxide indicates a reaction more complicated than (1) or (4) and favors reaction (2) or (5). Rice and Herzfeld32 have proposed a series of chain reactions for the thermal decomposition of acetone which would give both methane and ethane. The recombination of CH3 and CH3CO according to (2) might account for the low quantum yield. 

Possibly the anion itself undergoes changes before it acts upon the depolarizer, so that the organic compound can no-longer be spoken of as a true depolarizer for the anion but only for its decomposition products. Thus, in the presence of a base, the anion CH3COO would behave in such a manner that, after it was split up into ethane and carbonic acid, only the latter would react with the base. However, such a reaction can no longer be regarded as an electrochemical one. 

Hydrogen, metliane, and ethylene are also at tunes to be fomid amongst the products of oxidation, without, however, any carbon being liberated. Their appearance is believed to be due to the purely thermal decomposition of ethane, formaldehyde, and acetaldehyde.3 Thus ... 

In the present macro-scale experiments the filaments have been formed following reaction of ethane with iron and iron oxides. The decomposition of ethane to elemental carbon and hydrogen is endothermic (27) and so, at first sight, it appears that the experimental results are in conflict with the above mechanism of filament growth. However, earlier work (28) has shown that the majority of carbon formed from ethane arises from the decomposition product ethylene. The latter decomposes exothermically (27) (- A H for C2H4 at 725°C is 9.2 kcal. mole- ) so that this mechanism is not contravened. A similar rationale was used by Keep, Baker and France (29) to account for the formation of carbon filaments during the nickel catalyzed decomposition of propane. 

Another approach to deposit TiN layers at low temperatures was realized by remote plasma CVD (RPCVD) [68]. Almost conformal depositions could be achieved if hydrogen was activated by the plasma. In this particular case the nitrogen needed for the TiN formation is derived from one of the ligands, and the decomposition of this ligand leads to carbon contamination. Mass spectrometry showed only dimethylamine, ethane, methane and nitrogen as decomposition products, and the following mechanism was postulated... 

In this section we intend to describe a conceptual process alternative based on the experimental data presented in the previous section, and to use this flowscheme to show that there will be a distinct advantage in considering a two-step coal gasification subsystem. In the first step, the coal is pyrolyzed to release the larger carbon molecules such as methane, ethane, and propane which are the cream of the decomposition products of the coal molecule. In the second-step gasifier vessel the residue pyrolysis char reacts with steam and air to form the gas containing H2, CO, C02, etc., that is needed to fluidize the pyrolyzer. 

For an Al/Co ratio of about 1.5, ethane was also the main decomposition product at room temperature But the amount of methane increased significantly with the temperature and represented 50% of the hydrocarbons formed at 180°C in the presence of hydrogen This result could indicate a change of the catalyst composition even if we cannot explain clearly the origin of the methane ethane hydrogenolysis, AlEt acac decomposition,.. . ... 

The catalytic activity of CaNis hydrogen storage alloy is studied for decomposition of diethyl ether in the temperature range between 570 and 720 K by an atmospheric flow method. The alloy showed a catalytic activity at temperatures higher than 570 K. Following mechanism is proposed on the basis of the effect of W/F on the composition of products. Ethane and acetaldehyde are the initial products, while methane and carbon monoxide are the secondary products, formed by the decomposition of the acetaldehyde. 

C (53.6-57.2°F), initially the decomposition takes place slowly, bnt in the final phase, it goes very rapidly (Strong 1964). Highly flammable decomposition prodncts, such as acetaldehyde, ethane, acetone, and isopropyl alcohol, can cause fire if the heat of reaction is not dissipated. The fire hazard may be enhanced in the presence of solvents that are susceptible to hydrogen abstraction. This may be due to the decreased evolution of CO2, a major decomposition product, in the presence of such solvents. AUcyl carbonate radicals react with solvent moieties to form carbonate esters. 

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