Abstract:

ZSM-5-filled hydroxyl terminated polybutadiene（HTPB）-based polyurethane（PU）membranes（PU-ZSM-5），were prepared by a two-step polymerization process，and were used as membrane material to recover，isopropyl acetate（IPAC），from aqueous solution by pervaporation（PV）. The chemical structure，morphology and thermal stability of these filled membranes were characterized. The effects of ZSM-5 content on swelling degree and pervaporation performance were investigated. The results indicated that the incorporation of the ZSM-5 improved the thermal stability of the membranes apparently was compatible with the membranes. The swelling degree of the ZSM-5-?lled PU membranes decreased compared with that of PU membrane without ZSM-5，and with the increase of ZSM-5 content，the separation factor increased initially and then decreased. The PU-ZSM-5 membranes containing 20% ZSM-5 showed the highest separation factor for 1% IPAC in feed at 303K. With increasing operating temperature and feed concentration，both permeation ?ux and separation factor increased. The best PV performance of the PU-ZSM-5 membranes containing 20% ZSM-5，separation factor and total ?ux 288.72 g/(m²×h) and 53.21 g/(m²×h)，respectively was achieved with feed concentration of 1wt% IPAC at 333 K.

摘要：

采用两步法制备了ZSM-5沸石填充的疏水性端羟基聚丁二烯基聚氨酯（PU）膜，用以分离水中芳香性有机物乙酸异丙酯。对该膜的化学结构、形貌及热稳定性进行了表征，并研究了ZSM-5沸石填充的PU膜的溶胀度及渗透汽化性能。结果表明：添加ZSM-5沸石后，膜的热稳定性明显提高，沸石与膜的相容性较好，且随着添加量的增加，膜的溶胀度降低，分离因子先升后降。在303 K、料液浓质量分数为1%的条件下，ZSM-5添加量为20%（质量分数）时，分离因子达到最高；同时随着料液浓度及操作温度的上升，通量和分离因子都增加。在333 K、料液质量分数为1%的条件下，PU-ZSM-5-20膜的分离因子及通量最高可达288.72 g/(m²×h)和53.21 g/(m²×h)。