SCI和EI收录∣中国化工学会会刊

›› 2017, Vol. 25 ›› Issue (7): 971-975.doi: 10.1016/j.cjche.2016.08.014

• Chemical Engineering Thermodynamics • 上一篇    下一篇

Enthalpy of phase transition of isonicotinic acid

Dongfang Zhao, Guanghui Liu, Jian Sun, Lisheng Wang   

  1. School of Chemical Engineering and Environment, Beijing Institute of Technology, Beijing 100081, China
  • 收稿日期:2016-06-28 修回日期:2016-08-15 出版日期:2017-07-28 发布日期:2017-08-17
  • 通讯作者: Lisheng Wang,E-mail address:lishengwang@bit.edu.cn E-mail:lishengwang@bit.edu.cn

Enthalpy of phase transition of isonicotinic acid

Dongfang Zhao, Guanghui Liu, Jian Sun, Lisheng Wang   

  1. School of Chemical Engineering and Environment, Beijing Institute of Technology, Beijing 100081, China
  • Received:2016-06-28 Revised:2016-08-15 Online:2017-07-28 Published:2017-08-17

摘要: In this work, the group contribution method of Chickos et al. was applied to estimate the fusion enthalpy of isonicotinic acid, and the obtained result (29.2 kJ·mol-1) showed a large difference with the value (135 kJ·mol-1) as reported from literatures and as determined by differential scanning calorimetry (DSC). The results of DSC/TG measurement showed that the phase transition of isonicotinic acid from 187.27℃ to 277.47℃ underwent a sublimation process, with a sublimation enthalpy of 128.03 kJ·mol-1. An efficient analytical technique combining pyrolysis and gas chromatography/mass spectrometry (Py-GC/MS) was used to prove this conclusion.

关键词: Isonicotinic acid, Enthalpy of fusion, Group contribution method, Enthalpy of sublimation, Py-GC/MS

Abstract: In this work, the group contribution method of Chickos et al. was applied to estimate the fusion enthalpy of isonicotinic acid, and the obtained result (29.2 kJ·mol-1) showed a large difference with the value (135 kJ·mol-1) as reported from literatures and as determined by differential scanning calorimetry (DSC). The results of DSC/TG measurement showed that the phase transition of isonicotinic acid from 187.27℃ to 277.47℃ underwent a sublimation process, with a sublimation enthalpy of 128.03 kJ·mol-1. An efficient analytical technique combining pyrolysis and gas chromatography/mass spectrometry (Py-GC/MS) was used to prove this conclusion.

Key words: Isonicotinic acid, Enthalpy of fusion, Group contribution method, Enthalpy of sublimation, Py-GC/MS