PEBAX®2533/PSf中空纤维复合膜制备及阻力性能

采用浸渍涂层法制备了聚醚共聚酰胺(PEBAX®2533)/聚砜(PSf)中空纤维复合膜. 考察了涂层液浓度、 温度和基膜预处理对复合膜结构、 阻力及渗透性能的影响, 并考察了操作压力对膜渗透性能的影响. 实验结果表明, 随着涂层液浓度的增加, 复合膜致密层厚度及阻力增大, 复合膜总阻力及支撑层阻力先增大后减小, CO2渗透速率先减小后增大, 分离系数增大. 随着涂层温度升高, 复合膜致密层厚度及阻力减小, 支撑层阻力增大, 复合膜总阻力先减小后增大, 分离系数和渗透速率先增大后减小. 经过预处理, 复合膜致密层厚度减小、 阻力大幅度减小, CO2渗透速率增大58%, 分离系数略有下降. 复合膜支撑层阻力过大, 尤其是支撑层的致密结构影响复合膜的塑化行为.

Fabrication of PEBAX®2533/PSf Hollow Fiber Composition Membrane and Its Transfer Resistance

Poly(ether block amide) (PEBAX®2533)/polysulfone (PSf) hollow fiber composite membranes were fabricated by dip-coating technique. The effects of coating concentration, coating temperature, pretreatment on membrane structure, resistance and performance were studied. The effect of operation pressure on membrane performance was studied. The experimental results show that with the increase of the coating concentration, the thickness and resistance of dense skin increase, the total resistance and resistance of support layer first increase and then decrease, the CO2 permeance first decreases and then increases, the selectivity increases. With the increase of the coating temperature, the thickness and resistance of dense skin decrease, the resistance of support layer increases, the total resistance first decreases and then increases, the permeances and selectivity first increase and then decrease. The membrane resistance decreases with the pretreatment, and the CO2 permeance increases 58% with the slightly decrease of selectivity. The compact structure with large resistance in support layer affects the plastic phenomenon of the composite membrane.