The complete combustion of ethane releases 1561 kJ/mol, or 51.9 kJ/g, of heat, and produces carbon dioxide and water according to the chemical equation 2 C 2H 6 + 7 O 2 → 4 CO 2 + 6 H 2O + 3122 kJ/molĬombustion occurs by a complex series of free-radical reactions. In the chemical industry, more selective chemical reactions are used for the production of any particular two-carbon halocarbon. This reaction proceeds through the propagation of the ethyl radical:īecause halogenated ethanes can undergo further free radical halogenation, this process results in a mixture of several halogenated products. Ethane can react with the halogens, especially chlorine and bromine, by free radical halogenation. The chemistry of ethane also involves chiefly free radical reactions. At the anode, acetate is oxidized to produce carbon dioxide and methyl radicals, and the highly reactive methyl radicals combine to produce ethane:Īnother method, the oxidation of acetic anhydride by peroxides, is conceptually similar. In this technique, an aqueous solution of an acetate salt is electrolysed. In the laboratory, ethane may be conveniently prepared by Kolbe electrolysis. Its name was made from the name of ether, which at first meant diethyl ether. This error was corrected in 1864 by Carl Schorlemmer, who showed that the product of all these reactions was in fact ethane. They, however, mistook the product of these reactions for methyl radical, rather than the dimer of methyl, ethane. During the period 1847–1849, in an effort to vindicate the radical theory of organic chemistry, Hermann Kolbe and Edward Frankland produced ethane by the reductions of propionitrile (ethyl cyanide) and ethyl iodide with potassium metal, and, as did Faraday, by the electrolysis of aqueous acetates. He mistook the hydrocarbon product of this reaction for methane, and did not investigate it further. 6 Atmospheric and extraterrestrial ethaneĮthane was first prepared synthetically in 1834 by Michael Faraday, applying electrolysis of a potassium acetate solution.
0 kommentar(er)
