Abstract: Solid phase extraction (SPE) was used for sample pretreatment to enrich phenolic compounds from FCC diesel oil. The sample was separated into two classes: phenolic compounds and hydrocarbons. The elution conditions of the SPE column were optimized with the standard sample. The recovery and repeatability were tested under the optimized conditions. The qualified and quantified analysis of the compositions of phenolic compounds in fraction rich in phenolic compounds by gas chromatography-mass spectrometry, gas chromatography-flame ionization was conducted. It was shown that the recoveries of the standard compounds are 93%~108% and the relative standard deviation is less than 5% after repeated separation of the same sample for 5 times, indicating a good repeatability of the method. It was revealed that the flame ionization detection has a good linear response in the range of 2~300 μg/g of phenolic compounds; the difference among the relative response factor of phenolic compounds is not significant. It was found that phenols, naphthols and phenanthrols are the main components, of which the phenols account for 69.4%. It is concluded that the phenolic compounds in FCC diesel could be effectively enriched by the SPE method, which could be used for the qualified and quantified analysis of phenolic compounds.

Key words: solid phase extraction, catalytic cracking, diesel oil, phenolic compounds