University Chemistry ›› 2018, Vol. 33 ›› Issue (10): 85-90.doi: 10.3866/PKU.DXHX201801046

• Chemistry Laboratory • Previous Articles     Next Articles

Fractionation Effect and Method Improvement in the Experiment of Vapor-Liquid Equilibrium Phase Diagram of Cyclohexane-Ethanol System

Ou ZHENG*(),Baimao ZHANG,Shuying ZHU,Changcang HUANG,Shuting WU,Haohong LI*()   

  • Received:2018-01-31 Published:2018-11-01
  • Contact: Ou ZHENG,Haohong LI;
  • Supported by:


In this paper, the heating time and temperature distribution in the cyclohexane-ethanol vapor-liquid equilibrium system are investigated, and the influence of a thermal insulation cover has also been investigated. The experimental results show that the thermal insulation cover can shorten the heating time for the system to reach the vapor-liquid equilibrium, and reduce the temperature distribution gradient and the fractionation effect of the vapor phase in the distillation flask, thus, a more accurate phase diagram can be obtained.

Key words: Physical chemistry, Vapor-liquid phase diagram plotting, Fractionation effect