Experimental results for the vapor-liquid equilibria of (formaldehyde + 1,3,5-trioxane + methanol + salt + water) systems and comparison with predictions

Xianming Zhang; Mengchen Li; Yufeng Hu; Zhichang Liu; Shuqin Mo

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Experimental results for the vapor-liquid equilibria of (formaldehyde + 1,3,5-trioxane + methanol + salt + water) systems and comparison with predictions

Chemical Engineering Thermodynamics | Updated：2026-01-06

- Experimental results for the vapor-liquid equilibria of (formaldehyde + 1,3,5-trioxane + methanol + salt + water) systems and comparison with predictions
- Chinese Journal of Chemical Engineering Vol. 32, Issue 4, Pages: 291-300(2021)
- Affiliations：
  
  1. State Key Laboratory of Heavy Oil Processing and High Pressure Fluid Phase Behavior&Property Research Laboratory, China University of Petroleum,Beijing,China,102249
  2. School of Chemical Engineering, Ordos Institute of Technology,Ordos,China,017000
  3. PetroChina Petrochemical Research Institute Science Base PetroChina,Beijing,China,102206
- Author bio：
- Funds：
- DOI：
  CLC：
- Published：2021
- Accepted：
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Xianming Zhang, Mengchen Li, Yufeng Hu, Zhichang Liu, Shuqin Mo. Experimental results for the vapor-liquid equilibria of (formaldehyde + 1,3,5-trioxane + methanol + salt + water) systems and comparison with predictions[J]. Chinese Journal of Chemical Engineering, 2021, 32(4): 291-300.
DOI：

Xianming Zhang, Mengchen Li, Yufeng Hu, Zhichang Liu, Shuqin Mo. Experimental results for the vapor-liquid equilibria of (formaldehyde + 1,3,5-trioxane + methanol + salt + water) systems and comparison with predictions[J]. Chinese Journal of Chemical Engineering, 2021, 32(4): 291-300. DOI：

摘要

Abstract

The salt effect on the vapor-liquid phase equilibrium (VLE) of solvent mixtures is of significant interest in the industrial production of 1

5-trioxane. Experimental data for the VLE of quinary systems (formaldehyde + 1

5-trioxane + methanol + salt + water) and their ternary subsystems (formaldehyde + salt + water)

5-trioxane + salt + water)

and (methanol + salt + water) were systematic measured under atmospheric pressure. The salts considered included KBr

NaNO

and CaCl

. The extended UNIFAC model was used to describe the VLE of the salt-containing reactive mixtures. The model parameters were determined from the experimental VLE data of ternary systems or obtained from the literature

and then were used to predict the VLE of systems (1

5-trioxane + KBr + water)

(methanol + KBr + water)

(formaldehyde + KBr + water)

and (formaldehyde + 1

5-trioxane + methanol + salt + water) with salt=KBr

NaNO

and CaCl

. The predicted results showed good agreements with the measured results. Furthermore

the model was used to uncover the salt effect on the VLE of these multisolvent reac

tive systems.

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