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)。
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 flux and separation factor increased.The best PV performance of the PU-ZSM-5 membranes containing 20% ZSM-5,separation factor and total flux 288.72 g/（m2·h） and 53.21 g/（m2·h）,respectively was achieved with feed concentration of 1wt% IPAC at 333 K.
出处
《化工进展》
EI
CAS
CSCD
北大核心
2011年第9期1919-1925,共7页
Chemical Industry and Engineering Progress
基金
江南大学青年科学基金项目(2009LQN12)
