Optimization of methanol–vinyl acetate azeotrope separation process based on the pressure swing distillation and energy saving study

Xuefeng Feng; Huiqin Zhou; Yi Zhang; Shaolan Zhuang; Zhongwei Ding; Qunsheng Li; Yuxin Li

doi:10.1016/j.cjche.2025.06.004

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Optimization of methanol–vinyl acetate azeotrope separation process based on the pressure swing distillation and energy saving study

Updated：2026-01-06

- Optimization of methanol–vinyl acetate azeotrope separation process based on the pressure swing distillation and energy saving study
- Optimization of methanol–vinyl acetate azeotrope separation process based on the pressure swing distillation and energy saving study
- 中国化学工程学报（英文版） 2025年85卷第9期页码：167-181
- Affiliations：
  
  1. State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology,Beijing,China,100029
  2. Engineering Research Center of Preparation Technology of Ultra-Pure Chemicals for Integrated Circuits, Ministry of Education, Beijing University of Chemical Technology,Beijing,China,100029
  3. College of Basic Medical Science, Inner Mongolia Medical University, Inner Mongolia Key Lab of Molecular Biology,Hohhot,China,010059
  4. Inner Mongolia Algal Life Science Co., LTD, Ulanqab,China,011800
- Author bio：
- Funds：
- DOI：10.1016/j.cjche.2025.06.004
  中图分类号：
- 纸质出版：2025
- Accepted：
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Xuefeng Feng, Huiqin Zhou, Yi Zhang, 等. Optimization of methanol–vinyl acetate azeotrope separation process based on the pressure swing distillation and energy saving study[J]. 中国化学工程学报（英文版）, 2025,85(9):167-181.

Xuefeng Feng, Huiqin Zhou, Yi Zhang, Shaolan Zhuang, Zhongwei Ding, Qunsheng Li, Yuxin Li. Optimization of methanol–vinyl acetate azeotrope separation process based on the pressure swing distillation and energy saving study[J]. Chinese Journal of Chemical Engineering, 2025, 85(9): 167-181.
Xuefeng Feng, Huiqin Zhou, Yi Zhang, 等. Optimization of methanol–vinyl acetate azeotrope separation process based on the pressure swing distillation and energy saving study[J]. 中国化学工程学报（英文版）, 2025,85(9):167-181. DOI： 10.1016/j.cjche.2025.06.004.

Xuefeng Feng, Huiqin Zhou, Yi Zhang, Shaolan Zhuang, Zhongwei Ding, Qunsheng Li, Yuxin Li. Optimization of methanol–vinyl acetate azeotrope separation process based on the pressure swing distillation and energy saving study[J]. Chinese Journal of Chemical Engineering, 2025, 85(9): 167-181. DOI： 10.1016/j.cjche.2025.06.004.

摘要

Abstract

This study delves into the optimization of the methanol-vinyl acetate (VAC) azeotrope separation process

via

pressure swing distillation (PSD)

along with an evaluation of its energy-saving potential. The methanol-VAC system

a polar azeotrope highly susceptible to pressure variations

presents notable separation complexities in polyvinyl alcohol production. Aspen Plus simulations were utilized to assess the feasibility of PSD

with particular emphasis on critical process parameters such as the number of theoretical plates

feed position

reflux ratio

and sidestream extraction location. The results indicate that PSD demonstrates remarkable efficacy in separating methanol and VAC

achieving purities of 99.88% and 99.73% respectively. When compared to extractive distillation

PSD achieves a reduction of 9.07 t·h

-1

in steam consumption and minimizes wastewater generation by 20.77 t·h

-1

. Furthermore

the economic assessment reveals a 7.91% decrease in the total annual cost associated with PSD. This study not only provides theoretical insights but also offers practical guidance for the design of energy-efficient and sustainable separation processes. Future research will focus on extending the analysis to encompass multi-pressure scenarios

further enhancing the applicability and robustness of the findings.

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