Studies on explosion reaction of monovinyl acetylene gas : I. Explosion limits of monovinyl acetylene and monovinyl acetylene-air mixture

Abstract

The explosion limits of MVA and MVA-air mixtures were determined by use of the heated filament method and the admission method. In the former, the limit is 2.2～9.2 MVA vol. % at 760 mmHg and room temperature, and the lowest limit pressure is 365 mmHg at 4.8 MVA vol. %. The after glow is found near the normal explosion region, In the latter, isochors, isotherms and isobars were obtained under the conditions of below 700℃ and below 700 mmHg. Isotherms and isobars in the explosion limits have a specific shape (∽). That is, there is a peak in 80～90 MVA vol. % as shown in Figs. 10, 11 and 14. MVA is self-explosive. The reaction can be satisfactorily explained on the thermal explosion theory, and, assuming that the order of reaction is 2, the apparent activation energy is estimated to be 26～39 Kcal/mol below 550℃. The reaction consists of polymerization, decomposition and oxidation.