Abstract
The degradation products of polyethylene, especially a liquid fraction, formed over a silica-alumina catalyst were analyzed by glass capillary column gas chromatography. The liquid fraction contains large amounts of the same isoalkanes and aromatics as are present in the gasoline fraction of petroleum. Most of the isoalkanes are monobranched with a methyl group at the 2- or 3-position. The aromatics consist mainly of those with one or more methyl groups and are produced highly selectively at carbon numbers higher than 7. The degradation products are distributed in a narrow range of carbon number compared with those obtained by thermal degradation. The relative yield Of C 3C- 5 fractions was greater than 70 wt. % at the initial stage of the reaction. Isomerization, aromatization and hydrogen transfer reactions seem to play an important rôle in the secondary degradation of the primary products of polyethylene.
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