CO2/N2 gas separation with nano-zeolite NaX/Pebax-1657 mixed matrix membrane
Paper ID : 1238-MST2015-FULL
Authors:
Kiyoumars Zarshenas1, Ahmadreza Raisi2
1Amirkabir University of Technology (Tehran Polytechnic)
2Amirkabir University of Technology (Tehran Polytechnic)
Abstract:
In this work, nano-zeolite NaX was used for preparation of mixed matrix membranes to improve the CO2/N2 gas separation performance of the neat Pebax-1657 membrane. For this purpose, the zeolite nanoparticles were dispersed in a polymer solution of Pebax-1657 and formic acid as a solvent and cast on a porous PES support layer, and then the mixed matrix membrane was fabricated by the phase inversion technique via solvent evaporation. The zeolite nanoparticles were synthesized by hydrothermal method using microwave heating. The SEM and DSC analyses were used to evaluate the morphological and thermal properties of the prepared membranes. The gas separation properties of the membranes were investigated at different temperatures (25-45 °C) and pressures (3-7 bar). The experimental results indicated that the addition of zeolite nanoparticles into the Pebax-1657 matrix improved the selectivity of CO2/N2 with corresponding decrease in the gas permeabilities. As the operating temperature increased, the permeability of CO2 and N2 enhanced, however the CO2/N2 selectivity decreased. Also, an enhancement in the pressure resulted in higher CO2 permeability and lower N2 permeability which led to significant increase in the ideal selectivity of CO2/N2. It was found that the nano-zeolite NaX/Pebax-1657 mixed matrix membrane had improved gas separation performance in comparison to the neat membrane.
Keywords:
Mixed matrix membrane; Gas separation; Pebax-1657; Nano-zeolite NaX; CO2 separation
Status : Paper Accepted (Oral Presentation)