Extractive separation of benzene and non-benzene components from benzene-rich C6 fraction of FCC gasoline using ionic liquids
As health and environmental concerns become increasingly prioritized,countries and regions are imposing stricter regulations on the benzene content in automotive gasoline due to its carcinogenic nature.Catalytic cracking gasoline(FCC gasoline)is the primary component in China's automotive gasoline pool and the major source of benzene.FCC gasoline is characterized by its large volume,low benzene content,and high olefin content,making direct benzene removal challenging.However,the C6 fraction of FCC gasoline has a higher benzene content and a simpler composition,which enhances the efficiency and cost-effectiveness of benzene removal when used as the starting material.This study aims to reduce the benzene content in the C6 fraction of FCC gasoline.We investigated the effects of ionic liquid structure(cation core and substituents,anion)and temperature on the single-stage extraction efficiency of removing benzene from a model system.Additionally,we compared the performance of 1-ethyl-3-methylimidazolium thiocyanate([EMIM][SCN])and sulfolane as extractants,and examined the impact of various extractant-to-feed ratios and theoretical plate numbers in multi-stage countercurrent extraction on benzene removal efficiency and gasoline recovery.The results demonstrate that ionic liquids have the potential as alternatives to conventional organic solvents in removing benzene from FCC gasoline.
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