Abstract:

In order to avoid the aromatics waste and environmental pollution caused by ethylene bottom oil as a crude fuel for combustion, Fushun ethylene bottom oil was subjected to atmospheric distillation to obtain a fraction below 280 ℃. To achieve separation of ethylene bottom oil, the fraction below 280 ℃ was cut into 12 fractions(40~150 ℃, 150~170 ℃, 170~180 ℃, 180~190 ℃. 190~200 ℃, 200~210 ℃. 210~220 ℃, 220~230 ℃, 230~240 ℃, 240~250 ℃, 250~260 ℃. 260~280 ℃) by atmospheric distillation unit equipped with packed columns. The obtained 12 fractions were analyzed qualitatively and quantitatively by gas chromatography/mass spectrometry with an HP-5MS capillary column as the stationary phase. We hope it could provide valuable analytical data for the extraction of aromatic hydrocarbons, and the deep processing and utilization of ethylene bottom oil. The results indicate that the distillate below 280 ℃account for 52.2% of the total amount of ethylene bottom oil in Fushun, and mainly contained aromatic hydrocarbons with 1 to 4 rings. The mass fraction of monocyclic, tricyclic and tetracyclic aromatic hydrocarbons is small. The monocyclic aromatic hydrocarbons are mainly derivatives of benzene and indene that account for 5.8% and 6.172% of ethylene bottom oil in Fushun, respectively. The tricyclic and tetracyclic aromatic hydrocarbons account for 2.998% and mainly are acenaphthene, fluorene, anthracene, phenanthrene, pyrene and so on. The most abundant bicyclic aromatic hydrocarbons in Fushun ethylene bottom oil are naphthalene, followed by β-methylnaphthalene, α-methylnaphthalene and 1,4-dihydronaphthalene with mass fraction of 41.152%, 16.729%, 12.089% and 9.046%, respectively. This research shows that ethylene bottom oil in Fushun can be used as good feedstock for extracting high value-added aromatic fine chemicals.

Key words: ethylene bottom oil, atmospheric distillation, gas chromatography/mass spectrometry, aromatic hydrocarbons