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。