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|Section2= |Section3= }} Propyne (''methylacetylene'') is an alkyne with the chemical formula H3C≡CH. It was a component of MAPP gas—along with its isomer propadiene (allene), which was commonly used in gas welding. Unlike acetylene, propyne can be safely condensed.〔Peter Pässler, Werner Hefner, Klaus Buckl, Helmut Meinass, Andreas Meiswinkel, Hans-Jũrgen Wernicke, Günter Ebersberg, Richard Müller, Jürgen Bässler, Hartmut Behringer, Dieter Mayer, "Acetylene" in Ullmann's Encyclopedia of Industrial Chemistry Wiley-VCH, Weinheim 2007 ().〕 ==Production and equilibrium with propadiene== Propyne exists in equilibrium with propadiene, the mixture of propyne and propadiene being called MAPD: :H3CC≡CH (unicode:⇌) H2C=C=CH2 The coefficient of equilibrium Keq is 0.22 at 270 °C or 0.1 at 5 °C. MAPD is produced as a side product, often an undesirable one, by cracking propane to produce propene, an important feedstock in the chemical industry.〔 MAPD interferes with the catalytic polymerization of propene. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「propyne」の詳細全文を読む スポンサード リンク
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