合成次数及硅铝比调控SAPO-34分子筛膜的乙醇脱水性能  

Effects of synthesis times and Si-Al ratio of SAPO-34 zeolite membrane on ethanol dehydration performance

作　　者：丁婉月 马晓华[1] DING Wanyue;MA Xiaohua(State Key Laboratory of Chemical Engineering,Membrane Science and Engineering R&D Laboratory,Chemical Engineering Research Center,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]化学工程联合国家重点实验室,华东理工大学膜科学与工程研发中心,上海200237

出　　处：《化工学报》2021年第8期4410-4417,共8页CIESC Journal

基　　金：国家自然科学基金项目(21978081)。

摘　　要：SAPO-34分子筛膜因其独特的孔道结构和优异的稳定性被广大学者所青睐,目前的研究大多集中在催化、吸附和气体分离等方面,而关于其在液体分离中的研究鲜少报道。本文在Al_(2)O_(3)中空纤维支撑体表面分别一次和二次合成制备了SAPO-34分子筛膜,考察了四种不同硅铝比对SAPO-34分子筛膜结构形貌和性能的影响,并用于乙醇溶液的渗透汽化脱水,考察了操作温度、原料液中乙醇浓度以及分子筛合成次数对分离效果的影响。研究结果表明,硅铝比为0.5的二次合成的SAPO-34分子筛膜具有连续而致密的分离层和良好的渗透汽化分离性能,60℃下对乙醇(90%)-水(10%)的分离因子可以达到1170,渗透通量为0.9 kg/(m^(2)·h)。SAPO-34 zeolite membrane has been favored by many scholars because of its unique pore structure and excellent stability.Most of the studies focused on catalysis,adsorption and gas separation,while there are few studies on liquid separation.In this paper,SAPO-34 zeolite membranes were prepared through primary and secondary synthesis on the surface of Al_(2)O_(3)hollow fiber support,respectively.The effects of four different Si-Al ratios on the structure and performance of the SAPO-34 zeolite membranes were investigated.The obtained membranes were used for the pervaporation dehydration of ethanol solution.The effects of operating temperature,ethanol concentration and synthesis times on the separation properties of the obtained membranes were investigated.The results showed that the SAPO-34 zeolite membrane with Si-Al ratio of 0.5 and secondary synthesis had a continuous and dense separation layer,resulting in the best pervaporation performance.The separation factor of ethanol(90%)-water(10%)at 60℃was 1170,and the flux was 0.9 kg/(m^(2)·h).

关 键 词：硅铝比 二次生长法 SAPO-34分子筛膜 渗透汽化 乙醇脱水 

分 类 号：TQ028.8[化学工程]