Abstract: A new solid phase extraction method，which takes the packing loading silver ion as stationary phase，was developed to separate the saturates and aromatics in crude oils with different properties efficiently.The oil recovery, single processing capacity, separation efficiency as well as repeatability and universal applicability of the method were investigated. The results showed that the recovery of separating diesel fraction (180-350℃) and VGO (350-540℃) were 99.5% and 99.3%, respectively. The processing capacity and separation efficiency of crude oil are 47.5 times and 36 times, respectively, of that using the support designated in the standard method of petroleum industry. In addition, the standard deviation of repeated experiments was less than 0.5%, indicating a good repeatability of the method. The content of alkyl benzene in saturated fractions from light, medium and heavy crude oil of different base properties was less than 5%, indicating that the method has a good universal applicability.

Key words: crude oil, solid phase extraction, GC-MS, hydrocarbon composition