SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2021, Vol. 32 ›› Issue (4): 291-300.DOI: 10.1016/j.cjche.2020.11.019

• Chemical Engineering Thermodynamics • Previous Articles     Next Articles

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

Xianming Zhang1,2, Mengchen Li3, Yufeng Hu1, Zhichang Liu1, Shuqin Mo1   

  1. 1 State Key Laboratory of Heavy Oil Processing and High Pressure Fluid Phase Behavior&Property Research Laboratory, China University of Petroleum, Beijing 102249, China;
    2 School of Chemical Engineering, Ordos Institute of Technology, Ordos 017000, China;
    3 PetroChina Petrochemical Research Institute Science Base PetroChina, Beijing 102206, China
  • Received:2020-09-09 Revised:2020-11-08 Online:2021-06-19 Published:2021-04-28
  • Contact: Yufeng Hu, Zhichang Liu
  • Supported by:
    The authors gratefully acknowledge financial support from the National Natural Science Foundation of China (grant numbers 22078355, 21890763 and 21776300), Petrochemical Research Institute of PetroChina (grant number HX20200668), and Scientific Research Project of Ordos Institute of Technology (grant numbers KYYB2019006).

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

Xianming Zhang1,2, Mengchen Li3, Yufeng Hu1, Zhichang Liu1, Shuqin Mo1   

  1. 1 State Key Laboratory of Heavy Oil Processing and High Pressure Fluid Phase Behavior&Property Research Laboratory, China University of Petroleum, Beijing 102249, China;
    2 School of Chemical Engineering, Ordos Institute of Technology, Ordos 017000, China;
    3 PetroChina Petrochemical Research Institute Science Base PetroChina, Beijing 102206, China
  • 通讯作者: Yufeng Hu, Zhichang Liu
  • 基金资助:
    The authors gratefully acknowledge financial support from the National Natural Science Foundation of China (grant numbers 22078355, 21890763 and 21776300), Petrochemical Research Institute of PetroChina (grant number HX20200668), and Scientific Research Project of Ordos Institute of Technology (grant numbers KYYB2019006).

Abstract: The salt effect on the vapor-liquid phase equilibrium (VLE) of solvent mixtures is of significant interest in the industrial production of 1,3,5-trioxane. Experimental data for the VLE of quinary systems (formaldehyde + 1,3,5-trioxane + methanol + salt + water) and their ternary subsystems (formaldehyde + salt + water), (1,3,5-trioxane + salt + water), and (methanol + salt + water) were systematic measured under atmospheric pressure. The salts considered included KBr, NaNO3, and CaCl2. 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 (1,3,5-trioxane + KBr + water), (methanol + KBr + water), (formaldehyde + KBr + water), and (formaldehyde + 1,3,5-trioxane + methanol + salt + water) with salt=KBr, NaNO3, and CaCl2. 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 reactive systems.

Key words: Vapor liquid equilibria, Reactive distillation, Activity coefficient, 1,3,5-Trioxane production, UNIFAC, Salt effect

摘要: The salt effect on the vapor-liquid phase equilibrium (VLE) of solvent mixtures is of significant interest in the industrial production of 1,3,5-trioxane. Experimental data for the VLE of quinary systems (formaldehyde + 1,3,5-trioxane + methanol + salt + water) and their ternary subsystems (formaldehyde + salt + water), (1,3,5-trioxane + salt + water), and (methanol + salt + water) were systematic measured under atmospheric pressure. The salts considered included KBr, NaNO3, and CaCl2. 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 (1,3,5-trioxane + KBr + water), (methanol + KBr + water), (formaldehyde + KBr + water), and (formaldehyde + 1,3,5-trioxane + methanol + salt + water) with salt=KBr, NaNO3, and CaCl2. 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 reactive systems.

关键词: Vapor liquid equilibria, Reactive distillation, Activity coefficient, 1,3,5-Trioxane production, UNIFAC, Salt effect