NaA分子筛膜的合成及条件优化  

Synthesis of NaA zeolite membranes

作　　者：张青鹏[1] 周志辉[1] 郭大鹏[1] 尧鹏魁 李向波[1] 徐嘉晨[1] 

机构地区：[1]武汉科技大学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8期976-981,共6页Petrochemical Technology

摘　　要：以二次生长法为基础,在α-Al_2O_3载体上,采用热浸渍法合成出连续致密的NaA分子筛膜,并将其应用于乙醇脱水反应;通过改变铝源﹑搅拌转速﹑晶化时间﹑晶化温度及晶化次数等合成条件,对NaA分子筛膜的合成工艺进行了优化;采用XRD和SEM手段表征Na A分子筛膜。表征结果显示,合成的Na A分子筛膜晶体具有较高的结晶度。实验结果表明,以NaAlO_2(Na_2O含量38%(w),Al_2O_3含量50%(w),水含量11%(w))为合成液中的铝源,在搅拌转速为90 r/min、晶化温度为97℃、晶化2次、每次晶化时间均为3.6 h的条件下,可合成出渗透汽化性能更优的NaA分子筛膜,膜的渗透通量可以达到1.36 kg/(m^2·h),分离系数可达到12 730。Based on the secondary growth method, continuous and compact NaA zeolite membranes were synthesized on α-Al2O3 support through hot dip-coating. They were characterized by means of XRD and SEM, and applied in the dehydration of ethanol. Through changing the synthesis conditions, namely aluminum source, stirring speed, crystallization time, crystallization temperature and crystallization times, the synthesis process of the NaA zeolite membranes was optimized. It was shown that the synthesized NaA zeolite membranes had high crystallinity. The synthesized NaA zeolite membranes exhibited high performances in the pervaporization with the flux of 1.36 kg/（m2 . h） and the separation factor of 12 730 under the synthesis conditions of NaAlO2（Na2O content 38%（w）, Al2O3 content 50%（w）, water content 11%（w） as the aluminum source in the synthesizing solution, stirring speed 90 r/min, crystallization temperature 97 ℃, crystallization twice and each crystallization time 3.6 h.

关 键 词：NAA分子筛膜 乙醇脱水反应 渗透汽化 

分 类 号：TQ051.893[化学工程]