Having compared all separating ways, the authors made a proposal to refine n-heptane and reclaim methylcyclohexane from 120 solvent oil by using composite extraction separation.

• 研究比较各种分离方法，提出了用复合萃取分离法从120号溶剂油中分离出正庚烷并回收甲基环己烷的方案。