An extractive distillation process for recovering high purity benzene from pyrolysis gasoline was studied. The solvent selected was N -formylmorpholine(NFM) promoted by a co-solvent(COS).

• 采用N -甲酰吗啉 (NFM )添加一种助溶剂 (COS)构成复合溶剂作萃取精馏溶剂 ,从裂解加氢汽油苯馏分中回收高纯苯。