FCC汽油萃取精馏耦合重组分加氢脱硫研究

摘要

对 FCC 汽油萃取精馏耦合重组分加氢脱硫进行了研究。首先在连续萃取精馏小试装置上，以N-甲酰基吗啉为萃取剂考察萃取精馏脱硫效果。在优化的工艺条件下，塔顶低硫精制油收率达64.2%(v)，硫含量26 mg⋅L−1，总脱硫率达86.3%；塔底富硫重组分硫含量为366 mg⋅L−1，收率为35.8%。随后在小型固定床上采用 FGH-31催化剂对富硫重组分进行加氢脱硫，在优化操作条件下重组分加氢后硫含量降为9.5 mg⋅L−1，脱硫率达97.4%。萃取精馏的低硫精制油和经过加氢脱硫后的重组分均可作为优良的欧 IV 汽油调和组分。%　　Extractive distillation desulfurization of Fluid Catalytic Cracking (FCC) gasoline coupled with hydrodesulfurization of heavy fraction was investigated. FCC gasoline was desulfurized by an extractive distillation column using N-formylmorpholine as solvent. Under optimal desulfurization conditions, light fraction distillate yield reaches 64.2%(v), and its sulfur content is 26 mg⋅L−1. The total desulfurization efficiency of extractive distillation process could reach up to 86.3%. Sulfur in the heavy fraction is 366 mg⋅L−1, and the yield of heavy fraction is 35.8%. After that, the heavy fraction was hydrodesulfurized over FGH-31 catalyst in a fixed bed reactor. Results show that the sulfur compounds in the heavy cut could be reduced to 9.5 mg⋅L−1, and the sulfur removing efficiency reaches 97.4%. Light fraction of the extracted distillation and the hydrodesulfurized heavy cut are of primer blending compounds for producing high quality Europe IV standard gasoline.