CIESC Journal ›› 2020, Vol. 71 ›› Issue (1): 245-253.DOI: 10.11949/0438-1157.20191215

• Thermodynamics • Previous Articles     Next Articles

Solid-liquid phase equilibrium of dipentaerythritol in three mixed solvents

Tao LI1(),Jiao SHA1,Rui ZHAO1,2,Pengshuai ZHANG1,Shiqi LIU1,Yu LI1,Baozeng REN1()   

  1. 1. School of Chemical Engineering, Zhengzhou University, Zhengzhou 450001, Henan, China
    2. School of Chemical Engineering, Henan Chemical Technician College, Kaifeng 475000, Henan, China
  • Received:2019-10-23 Revised:2019-10-30 Online:2020-01-05 Published:2020-01-05
  • Contact: Baozeng REN

双季戊四醇在3种混合溶剂中的固-液相平衡

李涛1(),沙娇1,赵瑞1,2,张鹏帅1,刘士琪1,李玉1,任保增1()   

  1. 1. 郑州大学化工学院,河南 郑州 450001
    2. 河南化工技师学院,河南 开封 475000
  • 通讯作者: 任保增
  • 作者简介:李涛(1982—),男,博士,副教授,litao912@zzu.edu.cn
  • 基金资助:
    国家自然科学基金项目(21506197)

Abstract:

In this paper, by the dynamic balance method, the solubility of dipentaerythritol (DPE) in water+(Methanol, ethanol, isopropanol) mixed solvents were evaluated from 293.15 K to 332.80 K under atmospheric pressure. The results showed that the solubility of DPE in different mass fractions of water + (methanol, ethanol, isopropanol) mixed solvents increases with the increasing of temperature. At the same temperature, the solubility in the selected solvent system increases first and then decreases with the increase of the mass fraction of methanol, ethanol or isopropanol. Experimental solubility data were correlated by three thermodynamic models including λh equation, the two parameters equation and the modified Apelblat equation. All the selected models give useful result in regression analysis of solubility. By the modified van t Hoff equation, the calculated Δsol H 0, Δsol S 0 and Δsol G 0 of DPE in the selected solvent system are all positive, indicating that the dissolution process is endothermic, entropic and non spontaneous.

Key words: dipentaerythritol, solid-liquid equilibrium, solubility, gating characteristics, thermodynamic properties

摘要:

采用动态平衡法,在293.15~332.80 K、常压下,测定了双季戊四醇(DPE)在水+(甲醇、乙醇、异丙醇)三种混合溶剂中的溶解度数据。结果表明:DPE在不同质量分数的水+(甲醇、乙醇、异丙醇)混合溶剂中的溶解度随体系温度升高而增大;同一温度下,其在所选取溶剂体系中的溶解度随着甲醇、乙醇或异丙醇质量分数的增大而先增大后减小。λh方程、两参数方程与Apelblat方程均能够对所测定的溶解度数据进行较好的关联;通过修正的van’t Hoff方程计算得到DPE在所选取溶剂体系中Δsol H 0、Δsol S 0和Δsol G 0均大于零,表明DPE在所选取溶剂体系中的溶解过程为吸热、熵增的非自发过程。

关键词: 双季戊四醇, 固-液相平衡, 溶解度, 关联, 热力学性质

CLC Number: