ZIF-8 membranes for efficient C3H6 recovery from the Hydrogen Peroxide to propylene oxide process

Changhai Fan, Zhengwang Xia, Haiqian Lian, Luogang Wu, Eryue Song, Jingxian Hua, Li Shen, Rujing Hou, Yichang Pan, Weihong Xing

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

The ZIF-8 membrane has emerged as a promising candidate for C3H6/C3H8 separation. However, the feasibility of ZIF-8 membranes for applications has rarely been investigated with gas provided directly by the industry sector. Herein, the C3H6/C3H8 mixture collected from the backend of the Hydrogen Peroxide to Propylene Oxide (HPPO) process was applied as feed gas to examine the separation performance of tubular ZIF-8 membranes. The membranes exhibited excellent separation performance and long-term stability under 9 bar and 50 °C. Noticeably, upon scaling up to a membrane area of 452.16 cm2 by connecting six three-channel modules in series (multi-step membrane), its separation performance satisfied the C3H6 circulation requirements during the HPPO process (purity ≥97.5 % and recovery rate ≥85 %). Furthermore, a simulation of membrane operation under industrial working conditions (22 bar and 56.3 °C) was performed. By fixing the separation factor at 15, a minimum membrane area of 800 m2 met the requirements at the cost of membrane permeance with 120 GPU. The corresponding economic calculation indicated a maximum of 91.8 % annual capital cost saving compared with the distillation process, paving the way for the practical application of membranes.

Original languageEnglish
Article number123056
JournalJournal of Membrane Science
Volume708
DOIs
StatePublished - Aug 2024

Keywords

  • Aspen simulation
  • C3H6 recovery
  • Membrane module
  • Multi-step membrane
  • ZIF-8 membranes

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