This is a repository copy of A parametric study of the drying process of polypropylene particles in a pilot-scale fluidized bed dryer using Computational Fluid Dynamics.
CO 2 emissions have become one of the biggest industry challenges in recent years. Polymeric membranes have been studied as a promising alternative for CO 2 separation in various gas streams. Poly(ether-block-amide) is a widely used polymer in CO 2 separation, due to its CO 2 -philic nature. In this study, sorbitol as a poly alcoholic modifier was applied to improve the performance of the Pebax 2533 membrane for CO 2 separation over N 2 and CH 4 . The modified membranes were synthesized with 5 to 20 wt % of sorbitol. Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FESEM), atomic force microscopy (AFM), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and polarizing optical microscopy (POM) were applied to analyze the properties of the synthesized membranes. FTIR spectra confirmed the presence of all specific bands of Pebax 2533 and sorbitol in the modified membrane. Thermal analysis revealed an increase in the glass transition temperature as the sorbitol content within the membrane matrix was raised. The crystallinity of the membranes improved as the sorbitol content was increased up to 15 wt %. FESEM images of the pure membrane showed a uniform structure; however, an increased sorbitol load resulted in a more uneven structure appearing in the final product. Based on gas permeation tests, the CO 2 permeability, CO 2 /N 2 selectivity, and CO 2 /CH 4 selectivity enhanced from 392.5 Barrer, 37.74, and 9.5 in pure membranes to 394.5 Barrer, 48.7, and 13.11, in the modified membrane containing 15 wt % of sorbitol, respectively, at a pressure of 10 bar.
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