Messung und Simulation des Inertgaseinflusses auf Explosionsgrenzen bei erhöhten Anfangsdrücken

The upper explosion limit of lower alkanes and alkenes in air at elevated pressures and temperatures

“…This idea is further corroborated by Berl and Werner [27] who give a UEL of 68 mol% at 91 atm and of 71 mol% at 381 atm. Holtappels et al [26], however, have found a value of 80.8 mol% at 100 bar, which is about 10 mol% higher than the asymptotic value which would be found when extrapolating the data of Hashiguchi et al to an initial pressure of 100 bar. As the results of Holtappels et al correspond well with the data of this study for initial pressures of 1 and 10 bar, this would indicate a substantial increase of the UEL of ethylene-air mixtures at pressures above 50 bar.…”

“…Any detectable pressure -this was not stated more precisely -was taken as an indication of flammability. Holtappels et al [26] have measured the explosion limits of ethylene-air mixtures for pressures of 1, 10 and 100 bar in a 2.65 dm 3 explosion bomb. Ignition occurred by fusing a nichrome wire of 5 mm length and 0.12 mm diameter by applying 230 V ac.…”

“…As the results of Holtappels et al correspond well with the data of this study for initial pressures of 1 and 10 bar, this would indicate a substantial increase of the UEL of ethylene-air mixtures at pressures above 50 bar. A possible explanation is the instability of ethylene which is prone to decomposition at high pressures [26].…”

Explosion limits of mixtures relevant to the production of 1,2-dichloroethane (ethylene dichloride)

“…Moreover, the deviations are similar to the ones found by Van den Schoor and Verplaetsen (2006) for the UEL of ethylene/air mixtures. Holtappels et al (2001) have determined the LOC of ethylene/nitrogen/air mixtures at initial pressures of 1, 10 and 100 bar and at ambient temperature in a 2.65 l explosion vessel. Ignition occurred by fusing a nichrome wire of 5 mm length and 0.12 mm diameter by applying 230 V ac.…”

“…First, the offgas of the direct chlorination process with complete conversion of chlorine may contain ethylene, hydrogen, oxygen and inert gases. Some data are available in the literature for ethylene/hydrogen/air mixtures (Wierzba & Ale, 2000) and for ethylene/nitrogen/air mixtures (Craven & Foster, 1966;Holtappels et al, 2001), but none can be found for ethylene/hydrogen/nitrogen/air mixtures. Second, the feed of the oxychlorination process typically contains ethylene, hydrogen chloride, oxygen and nitrogen.…”