从120号溶剂油中提取正庚烷并回收甲基环己烷的研究

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

总结了国内外正庚烷的生产状况和市场行情,分析了中小型石化企业生产正庚烷的可行性,提出采用萃取精馏分离正庚烷的方法．在间歇精馏塔塔顶温度为91-101℃、塔釜为103-110℃的条件下,可以得到58％以上正庚烷和甲基环己烷的混合液．根据物质相关性质,初步确定有关萃取溶剂,利用单级循环汽液平衡釜对初选的萃取剂进行实验研究。选定乙二醇作为萃取剂,为进一步实验研究提供依据．

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.