Abstract Separation of olefin from fluid catalytic cracking (FCC) naphtha is a high way to protect the research octane number (RON) from a loss during hydrodesulfurization. Solvent extraction is a promising way to separate olefin and extract sulfides simultaneously. In order to realize effective separation of olefin from FCC naphtha, this paper focused on the development of a kind of high efficient solvent and optimization of corresponding operation conditions for olefin separation. The results showed the combined solvents consisted of sulfolane (95 v%) and N-methyl-2-pyrrolidone (5 v%) exhibited high separation capability for olefin, and the best solvent to oil ratio was 3:1. Based on the combined solvent and optimal solvent to oil ratio, the best olefin enrichment coefficient could be up to 97.63 indicating lots of olefin enriched in raffinate. The desulfurization efficiency exceeded 90% after 3-stage extraction by the combined solvents, which was close to and even prior to some kinds of ionic liquids. Moreover, the combined solvents exhibited remarkable stability, and variation of desulfurization efficiency of the combined solvents was only around 1% after recycled 8 times. These studies gave a high efficient way to upgrade clean gasoline by separating olefin and enriching sulfides from FCC naphtha.

中文翻译：

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从 FCC 石脑油中高效分离烯烃：组合溶剂和相关萃取条件的影响

摘要 从流化催化裂化（FCC）石脑油中分离烯烃是保护研究辛烷值（RON）在加氢脱硫过程中不损失的重要途径。溶剂萃取是同时分离烯烃和萃取硫化物的一种很有前景的方法。为了实现FCC石脑油中烯烃的有效分离，本文重点研究了一种高效溶剂的开发和烯烃分离相应操作条件的优化。结果表明，环丁砜（95 v%）和N-甲基-2-吡咯烷酮（5 v%）组成的混合溶剂对烯烃表现出较高的分离能力，最佳溶剂油比为3:1。根据组合溶剂和最佳溶剂油比，最佳烯烃富集系数可达97.63，表明萃余液中烯烃富集很多。组合溶剂经三级萃取后脱硫效率超过90%，接近甚至领先于某些离子液体。此外，组合溶剂表现出显着的稳定性，组合溶剂循环使用8次后脱硫效率的变化仅为1%左右。这些研究提供了一种通过从 FCC 石脑油中分离烯烃和富集硫化物来升级清洁汽油的高效方法。