大学化学 >> 2020, Vol. 35 >> Issue (1): 87-91.doi: 10.3866/PKU.DXHX201905002

化学实验 上一篇    下一篇

温度补偿法解决二元气液平衡系统相图绘制实验中的分馏效应

宋丽平,王亚婷,郑欧*(),吴舒婷,祝淑颖,陈建中   

  • 收稿日期:2019-05-06 录用日期:2019-08-05 发布日期:2019-08-19
  • 通讯作者: 郑欧 E-mail:zhengouou@163.com
  • 基金资助:
    国家自然科学基金项目(21775026);福州大学一流本科教育改革项目(003698);福州大学本科生科研训练项目(25071)

Temperature Compensation Method to Solve the Fractionation Effect in the Experiment of Binary Vapor-Liquid Equilibrium System Phase Diagram

Liping Song,Yating Wang,Ou Zheng*(),Shuting Wu,Shuying Zhu,Jianzhong Chen   

  • Received:2019-05-06 Accepted:2019-08-05 Published:2019-08-19
  • Contact: Ou Zheng E-mail:zhengouou@163.com
  • Supported by:
    国家自然科学基金项目(21775026);福州大学一流本科教育改革项目(003698);福州大学本科生科研训练项目(25071)

摘要:

通过改装二元气液平衡系统相图绘制实验的装置,同时测定了环己烷-乙醇气液系统建立平衡时的沸点和露点温度,绘制并对比未保温、保温和温度补偿条件下的环己烷-乙醇气液相图。研究发现,由于分馏效应的存在,未保温和简易保温情况下,测得的溶液的沸点与露点两者温度均存在较大的差异,利用沸点温度绘制的气相线存在严重失真;对系统进行了温度补偿后根据沸点和露点温度绘制的两条气相线能吻合较好,即气相分馏效应得到了解决。

关键词: 物理化学, 气液相图绘制, 分馏效应, 温度补偿

Abstract:

In this paper, the device for phase diagram development experiment has been modified, which can be used to measure the boiling point and dew point of vapor-liquid equilibrium system simultaneously. In addition, the vapor-liquid phase diagrams of cyclohexane-ethanol under the conditions of no heat preservation, heat preservation and temperature compensation are drawn and compared. Results show that there is a great difference between the temperatures of boiling point and dew point both for the vapor-liquid equilibrium system with the simple heat preservation or without the heat preservation, and the vapor-phase lines based on the boiling point temperature are seriously distorted. With the temperature compensation for the system, the two vapor-phase lines according to the boiling point and the dew point temperature are in good agreement, which means the problem of vapor-phase fractionation effect has been solved.

Key words: Physical chemistry, Vapor-liquid phase diagram drawing, Fractionation effect, Temperature compensation

MSC2000: 

  • G64