Vinylacetylene as an intermediate in the formation of acetylenic carbon

✍ Scribed by M.S.B Munson; R.C Anderson

• Publisher: Elsevier Science
• Year: 1963
• Tongue: English
• Weight: 268 KB
• Volume: 1
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(63)90009-5

✦ Synopsis

Experiment in recent years on the formation of gas carbon from hydrocarbons, particularly acetylene, indicate that straight-chain unsaturated hydrocarbons rather than aromatics may be formed as intermediates; and some data have been reported on the role of diacetylene in such processes. The present investigation was undertaken to explore the possible effects of vinylacetylene, which is also a possible early product of the reaction of acetylene. The formation and reaction of vinylacetylene during pyrolysis of acetylene in a flow reactor at temperatures in the range of 5QO-860°C were studied, using chromatographic analysis to determine constituents of the reaction mixtures. Diacetylene was not found in any appreciable amount at these temperatures.

The results indicate that at these temperatures vinylacetylene is an intermediate in one path to decomposition and carbon formation, but that this is not, of course, the only reaction path. These are not inconsistent with the data of Kinney and Slysh on the reactions of diacetylene at higher temperatures; but other data from shock-tube experiments raise some unresolved questions about the reactions of the two substances.