Selective separation of CO2 using novel mixed matrix membranes based on Pebax and liquid-like nanoparticle organic hybrid materials
2019
Wang, Junfeng | Fang, Wenjuan | Luo, Jianquan | Gao, Ming | Wan, Yinhua | Zhang, Suojiang | Zhang, Xiangping | Park, Ah-Hyung Alissa
Pebax1657 is known as a promising polymeric membrane material for CO₂ separation. In order to further improve its gas separation performance, different polymers containing ethylene oxide (EO) groups are incorporated into the Pebax1657 matrix to form mixed matrix membranes (MMMs). Liquid-like nanoparticle organic hybrid materials (NOHM-I-HPE, “I” stands for “ionic bond” and “HPE” refers to polyetheramine (“PE”) with a high (“H”) ether group content), which are made of polyetheramine chains tethered onto functionalized silica nanoparticles, have shown high solubility of CO₂. In this study, the homogenous NOHM-I-HPE/Pebax1657 MMMs with different NOHM-I-HPE loadings are prepared and investigated. The results indicate that the addition of NOHM-I-HPE leads to a decrease in glass transition temperature of Pebax1657 and an increase in EO content of the MMMs. Influences of NOHM-I-HPE content on CO₂, N₂ and CH₄ permeations are investigated at 23 °C and 1 bar. For the NOHM-I-HPE loading ranging from 0 to 60 wt%, solubility coefficients of the MMMs for CO₂ greatly increase from 1.16 to 3.84 cm³ (STP)/(cm³·bar), while those for CH₄ and N₂ only increase from 0.078 to 0.094 cm³ (STP)/(cm³·bar) and from 0.013 to 0.026 cm³ (STP)/(cm³·bar), respectively. Although the CO₂/N₂ selectivity slightly decreases with an increase in the NOHM-I-HPE loading, the CO₂/CH₄ selectivity is improved in the newly developed NOHM-I-HPE/Pebax1657 MMMs. These results indicate that the NOHM-I-HPE/Pebax1657 MMMs are very promising candidates for selective CO₂ separation for various energy related applications.
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