Study on the Refining of n-Heptane and the Recovery of Methylcyclohexane from the 120 Solvent Oil

In this paper, the production and the market (domestic and foreign) quotation of n-heptane was summarized , the feasibility of n-heptane production is analyzed for the middle and small petrochemistry enterprises. When the top temperature of batch fractionating tower is 91 - 101℃ and the bottom temperature is 103 - 110℃ , a mixture containing 58% of n-heptane and methylcyclohexane can be obtained with batch distillation. The selection of extraction solvents is studied using the single stage circulation equilibrium cell. The extractive distillation method is proposed for the selective separation of n-heptane. The extractive solvents are selected tentatively. Ethylene glycol is found to be the desired solvent. Fundamental thermodynamic data is provided for further experimental study.