T型分子筛膜的制备及其在有机物废水中的应用

Preparation of T-type molecular sieve membrane and its application in treatment of organic wastewater

采用二次生长法在四通道α-Al_(2)O_(3)中空纤维支撑体上制备T型分子筛膜,系统优化了合成温度、合成时间、合成液碱含量。结果表明,当合成液摩尔组成为n(SiO_(2))∶n(Al_(2)O_(3))∶n(Na_(2)O)∶n(K_(2)O)∶n(H_(2)O)=1∶0.05∶0.26∶0.09∶17、合成温度为105℃时,水热合成35 h可制备出高性能的T型分子筛膜;用于90%乙醇/水混合体系脱水,在75℃下,膜分离因子可达6500;在p H=5.5、含水70%的DMAC/水体系中,经分子筛膜脱水后产品水含量降为0.52%,渗透液平均COD仅为4400 mg/L。

T-type molecular sieve membrane is synthesized on four-channelα-Al_(2)O_(3) hollow fiber support by a secondary growth method.Synthesis temperature,synthesis time,and alkalinity in synthesis solution are systematically optimized.The results show that high performance T-type zeolite membrane can be obtained when n(SiO_(2))∶n(Al_(2)O_(3))∶n(Na_(2)O)∶n(K_(2)O)∶n(H_(2)O)=1∶0.05∶0.26∶0.09∶17,and the synthesis has performed at 105℃ for 35 h.Its separation factor can achieve 6500 when it is used for a 90 wt.% ethanol/water mixing system at 75℃.Water content drops from 70 wt.% to 0.52 wt.% for the dehydration of DMAC/H2O with a p H value of 5.5,and the average COD in the permeate side is only 4400 mg·L-1.