Study on refining α-olefin by complex extraction process of coking kerosene fraction

Taking the coking kerosene fraction of a refinery as the refined raw oil, the complex extraction process was used to refine the α-olefins and alkanes in the raw oil. The effects of different complex extraction agents and operating conditions such as temperature were investigated, and the characterization analysis was performed. The results showed that Ag⁺ reagent 1-N-methylpyrrolidone (NMP) was selected as the complex extraction agents, and the extraction temperature was 120 ℃, the mass ratio of agent to oil was 0.5∶1, and the operating conditions of laboratory-made adsorbent were used to obtain the best refine effect. The yield of refined product oil obtained through experiments was 83.45%. The mass fraction of purified α-olefin was 70.07%. The removal rate of sulfur could reach 29.73%, and the removal rate of nitrogen could reach 66.09%. The carbon number distribution of refined oil was mainly between C₈-C₁₄. The FT-IR characterization results showed that the functional groups contained in the coking kerosene fraction were mainly O-H, C-H and RCH=CH₂, and the obtained refined oil could be used for polyreaction to generate PAO.