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Encyclopedia Britannica - Main :: EMS-EUD |
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ETHYLENE, or ETHENE, C2H4 , or H2C:CH2, the first representative of the series of olefine hydrocarbons, is found in coal gas. It is usually prepared by heating
ethyl
ethyl
heating
caustic
electrolysis of a concentrated solution of potassium succinate,(CH2. CO2K) 2+2H20 = C2H4+2CO2+2KOH +H2. It is a colourless gas of somewhat sweetish taste ; it is slightlysoluble in water, but more so in alcohol and ether. It can be liquefied at-1.1 C., under a pressure of 42i atmos, It solidifies at-181 C. and melts at-169 C. (K. Olszewski); it boils at -105 C. (L. P. Cailletet), or-102 to-103 C. (K. Olszewski). Its critical temperature is 13 C., and its specific gravity is o9784(air =1). The specific gravity of liquid ethylene is o386 (3 C.). Ethylene burns with a bright luminous flame, and forms a veryexplosive mixture with oxygen. For the combustion of ethylene see FLAME. On strong heating it decomposes, giving, among other products, carbon, methane and acetylene (M. Berthelot, Ann., 1866, 139, p. 277). Being an unsaturated hydrocarbon, it is capable of forming addition products, e.g. it combines with hydrogen in the presence of platinum black, to form ethane,End of Article: ETHYLENE, or ETHENE, C2H4 If you wish, you can link directly to this article.
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