Enthalpy of phase transition of isonicotinic acid

Dongfang Zhao; Guanghui Liu; Jian Sun; Lisheng Wang

doi:10.1016/j.cjche.2016.08.014

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Enthalpy of phase transition of isonicotinic acid

Chemical Engineering Thermodynamics | Updated：2026-01-06

- Enthalpy of phase transition of isonicotinic acid
- Chinese Journal of Chemical Engineering Vol. 25, Issue 7, Pages: 971-975(2017)
- Affiliations：
  
  School of Chemical Engineering and Environment, Beijing Institute of Technology,Beijing,China,100081
- Author bio：
- Funds：
- DOI：10.1016/j.cjche.2016.08.014
  CLC：
- Published：2017
- Accepted：
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Dongfang Zhao, Guanghui Liu, Jian Sun, Lisheng Wang. Enthalpy of phase transition of isonicotinic acid[J]. , 2017, 25(7): 971-975.
DOI：

Dongfang Zhao, Guanghui Liu, Jian Sun, Lisheng Wang. Enthalpy of phase transition of isonicotinic acid[J]. , 2017, 25(7): 971-975. DOI： 10.1016/j.cjche.2016.08.014.

摘要

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.

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