UiO-66-NH2 incorporated dual-layer hollow fibers made by immiscibility induced phase separation (I2PS) process for ethanol dehydration via pervaporation

Publication date: Available online 15 October 2019Source: Journal of Membrane ScienceAuthor(s): Yi Ming Xu, Susilo Japip, Tai-Shung ChungAbstractHigh performance dual-layer hollow fiber membranes have been developed for ethanol dehydration by incorporating a tiny amount (i.e., less than 0.3 wt%) of UiO-66-NH2 particles into cellulose triacetate (CTA)/Ultem® hollow fibers fabricated by the immiscibility induced phase separation (I2PS) process. Effects of particle loading, air gap, feed temperature, feed composition and heat treatment on membrane performance for ethanol dehydration were systematically studied. Positron annihilation spectroscopy (PAS) analyses were conducted to disclose the mechanisms of performance enhancement. Adding UiO-66-NH2 particles improves the permeation flux due to the reduced transport resistance and the enhanced affinity between water and the membrane. The hollow fiber (O-0.2-1.5) consisting of 0.2 wt% UiO-66-NH2 particles in the outer layer possesses the most outstanding separation performance among the newly developed hollow fibers. It has an ultra-high flux of 2667g/m2h (i.e., water permeance of 20.05 mol/m2h kPa) and its permeate comprises 95.00 wt% water, equivalent to a mole-based selectivity of 152 at 50 °C with a feed comprising 85 wt% water and 15 wt% ethanol. After annealing at 120 °C for 2h, the flux drops to 1977 g/m2h but the water concentration in permeate jumps to 98.07 wt%. A comparison with literature data veri...
Source: Journal of Membrane Science - Category: Materials Science Source Type: research