期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 268, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.seppur.2021.118677
关键词
Mixed matrix membranes; Organic porous additives; Polyimide; Gas separation; Anti-aging property
资金
- National Key R&D Program of China [2017YFB0603402]
- National Natural Science Foundation of China [21576217]
- Fundamental Research Funds for the Central Universities [xjj2016044]
- Monash University Postgraduate Publication Award scheme
- Veski Inspiring Women Fellowship
This study investigates the anti-aging properties of PAF-1 and p-DCX in a highly selective polyimide (PI) polymer for industrial CO2 separation. The PI membranes showed slower CO2 aging rates and significantly enhanced CO2 permeability with the addition of PAF-1 and p-DCX, surpassing 2008 Upper Bounds for both CO2/N2 and CO2/CH4 separation in mixed-gas performance.
Gradual permeability loss due to physical aging and the trade-off relationship between permeability and selectivity has largely hindered the advancement of membrane technology. In our prior works, porous aromatic framework (PAF-1) and poly-dichloroxylene (p-DCX) incorporated mixed matrix membranes (MMMs) have shown excellent anti-aging properties, achieved through polymer side chains adsorbing within PAF-1 or p-DCX pores. Advantageously, antiaging behaviour was usually also accompanied by enhanced membrane permeability due to the high porosity of the PAF-1 or p-DCX additive. However, these works mostly focused on polymers with moderate selectivities, such as polymers of intrinsic microporosity (PIM-1) and poly-trimethylsilyl-propyne (PTMSP). In this work, we investigated the anti-aging properties of PAF-1 and p-DCX in a highly selective polyimide (PI) polymer and demonstrated its potential for industrial CO2 separation. As anticipated, PI membranes demonstrated a slower CO2 aging rate with the addition of PAF-1 and p-DCX, for both single gases under lowpressure and mixed gas under high-pressure measurements. Additionally, the CO2 permeability was significantly enhanced, and consequently the mixed-gas performance of the composite PI-based membranes surpassed 2008 Upper Bounds for both CO2/N2 and CO2/CH4 separation.
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