新型耐高温聚芳酰胺复合膜的制备及性能

为了将反渗透技术在高温流体环境中使用,研究制备具有较高热稳定性的超滤膜以制备耐热性良好的复合膜,以杂萘联苯聚芳醚超滤膜为支撑层,通过间苯二胺与均苯三甲酰氯的界面聚合制备聚芳酰胺复合膜.研究了聚合反应中单体的浓度、反应温度和反应时间等与膜性能的关系.用原子力显微镜照片表征了膜表面形貌的变化,证明致密复合层的形成是膜性能变化的关键.考察了操作温度、压力对膜性能的影响.随着操作压力和温度的提高,膜的通量迅速增加,但对2000 mg·L-1的NaCl溶液的截留率则保持在99.0%左右,无明显变化.膜在1.6 MPa、80℃下重复测试30 d,性能无明显降低,说明其具有良好热稳定性.

Preparation and performance of a novel thermal stable polyamide composite membrane

A novel thermal stable composite membrane was prepared through interfacial polymerization of m-phenylene diamine and trimesoyl chloride on a poly(phthalazinone ether) ultrafiltration membrane.The proper concentration of monomers was selected and the reaction parameters were optimized.The surface morphology of the composite membrane and the substrate was observed by an atomic force microscopy(AFM),and the formation of the dense active layer was testified to be the key factor affecting the membrane performance.The effects of the operating pressure and temperature on the performance of composite membrane were discussed.The flux of the membrane increased dramatically with the increase of operating pressure and temperaturebut no significant change was observed on the rejection of the membrane.The rejection of the membrane for 2000 mg·L-1 NaCl aqueous solutions was kept at 99.0%.There was no significant decrease observed on the membrane performance even after being tested at 80 ℃ for 30 d,which testified the thermal stability of the membrane.