Effect of Silica Nanoparticles on the Polysulfone Membranes for Olefin/Paraffin Separation
Paper ID : 1307-MST2015-FULL
Authors:
najme gholamipoor1, Morteza Sadeghi *2, Sahar Favakeh2, elmira tavasoli1, ali pournaghshband1
1Isfahan university of technology
2isfahan university of technology
Abstract:
In the present study, the separation of ethylene/ethane and propylene/propane by polysulfone-silica nanocomposite membranes were studied. Silica nanoparticles were prepared via sol-gel method. Membranes were prepared by phase inversion method. The prepared membranes were characterized using FT-IR and SEM analyses. The results show a good distribution of silica particles in the polymer matrix and also a good compatibility between the two phases investigated. The performances of the prepared membranes in ethylene/ethane and propylene/propane separation were measured at 2 bar and 30 ◦C. The obtained results showed that the permeability of ethylene and propylene increased from 0.092 barrer and 0.054 barrer in pure polysulfone to 0.191 barrer and 0.149 barrer in the composite membrane containing 25%wt silica particles. Also the selectivity of C2H4/C2H6 and C3H6/C3H8 increased from 2.18 and 2.93 in pure membrane to 2.62 and 3.58 in the composite membrane containing 25%wt silica particles. The diffusivity and solubility coefficients were determined by the time lag method. The results showed an increase in solubility coefficient and decrease in diffusion coefficient of gases with increasing the silica. To investigate the effect of silica nanoparticles on plasticization phenomena, gas permeation of PSF and PSF-silica nanocomposite membranes was studied for ethylene, ethane, propylene and propane single gases at pressure range of 2-8 bar. Plasticization was observed in pure membrane at the feed pressure of 3 bar for all gases while, in nanocomposite membranes the plasticization pressure has moved to a higher pressures.
Keywords:
Olefin-Paraffin separation, nanocomposite membrane, polysulfone, silica, gas separation
Status : Paper Accepted (Poster Presentation)