Pyrolysis and oxidation of asymmetric ethers : Contribution towards the mechanistic interpretation of their high octane number
This research aims at an understanding of the reaction mechanisms which give rise to the highly effective anti-knocking properties of three asymmetric ethers: methyl tert-butyl ether, tert-amyl ether and ethyl tert-butyl ether; the first two are already used to raise the octane number of commercial fuels. Study of the thermal reaction of their equimolecular mixtures shows that these ethers oxidise less readily than alcanes of a similar structure, as their high octane numbers would indicate. The results demonstrate that their reaction with O(2) has the characteristics of oxidising degradation rather than true oxidation. It appears that when oxidising with a hydrocarbon, these ethers play the part of a "negative catalyst", transforming the reactive radicals which carry the oxidation chains into more or less unreactive radicals which are unable to propagate the reaction sufficiently fast to set off the spontaneous ignition which gives rise to pinking.
Bibliographic Reference: EUR 13248 FR (1991) 232 pp., MF, ECU 12
Record Number: 199110025 / Last updated on: 1994-12-02
Original language: fr
Available languages: fr