NaA沸石膜渗透蒸发脱除卤代烷烃中微量水  

Removal of trace water from alkyl halides through pervaporization with NaA zeolite membrane

作　　者：尧鹏魁 周志辉[1] 吴红丹[1] 张青鹏[1] 徐嘉晨[1] 

机构地区：[1]武汉科技大学资源与环境工程学院冶金矿产资源高效利用与造块湖北省重点实验室,湖北武汉430081

出　　处：《石油化工》2016年第12期1475-1480,共6页Petrochemical Technology

摘　　要：利用二次生长法,在α-Al_2O_3载体外表面合成NaA沸石膜,并采用SEM和XRD等方法对合成的NaA沸石膜进行表征。将合成的NaA沸石膜应用在渗透蒸发脱除卤代烷烃中微量水,考察了进料流量、渗透侧压力和操作温度等对膜渗透汽化性能的影响。表征结果显示,制备出了连续、致密、高纯度的NaA沸石膜,且膜层厚度仅为10μm。实验结果表明,NaA沸石膜应用在一氯甲烷脱水中,当操作温度从10℃上升到80℃时,对水的通量一直维持在0.15kg/(m^2·h)以上;NaA沸石膜应用在二氯甲烷脱水中,当进料流量增加到198mL/min时,膜相应的渗透通量和分离因子分别达到0.172kg/(m^2·h)和39900;NaA沸石膜应用在氯仿脱水中,当操作温度升高至50℃时,渗透通量达到最大值0.564kg/(m^2·h);NaA沸石膜应用在四氯化碳脱水中,当操作温度升高至60℃时,渗透通量可达到0.612kg/(m^2·h)。NaA zeolite membranes were synthesized via the secondary growth method on the surface of α-Al2O3. The membranes were characterized by means of SEM and XRD, and used in the removal of trace water from alkyl halides. The effects of feed flow, pressure on permeation side and operating temperature on the pervaporization performances of the NaA zeolite membranes were studied. The results showed that, when the NaA zeolite membrane was applied to the dehydration of methyl chloride and the operating temperature rose from 10 ℃ to 80 ℃, the water flux was always maintained above 0.15 kg/（m2 · h）. The application of the NaA zeolite membrane to the dehydration of dichloromethane indicated that, when the feed flow increased to 198 mL/min, the permeation flux and the separation factor of the membrane achieved 0.172 kg/（m2 ·h） and 39 900, respectively. When the NaA zeolite membrane was used in the dehydration of chloroform and the operating temperature rose to 50 ℃, the permeation flux reached the maximum value of 0.564 kg/（m2 · h）. When the NaA zeolite membrane was applied in the dehydration of carbon tetrachloride and the operating temperature rose to 60 ℃, the permeation flux could reach 0.612 kg/（m2 · h）.

关 键 词：NAA沸石膜 二次生长法 微量水 卤代烷烃 渗透蒸发 

分 类 号：TQ028.8[化学工程]