He Qiu-Ping, Zou Yun, Wang Peng-Fei, Dou Xiao-Ming
Institute of Photonics & Bio-medicine, School of Science, East China University of Science and Technology, Shanghai 200062, People's Republic of China.
Shanghai Lvqiang New Materials Co., Ltd, Shanghai 200062, People's Republic of China.
Nanotechnology. 2021 Sep 2;32(47). doi: 10.1088/1361-6528/ac1d09.
Silicalite-1 zeolitic membranes have been successfully fabricated on the porous-AlOsupport by templated and template-free protocol, respectively, for vapor permeation separation of dichlorobenzene (DCB) isomers. After proving the high quality of the membranes by single gas permeation (He and SF) performance, the vapor-permeation of DCB isomers over two types of the silicalite-1 membrane was then investigated. The separation results clearly indicated that under the lower partial pressure and higher temperature, the effect of DCB isomer adsorption on the permeance could be kept at a sufficiently low level and sharp selectivity become more important. Thus, highDCB selectivity could be achieved. Comparatively, the template-free silicalite-1 zeolite has a much higher p-DCB selectivity due to the relatively fewer inter-crystalline gaps. Under certain separation conditions, the highest selectivity of-DCB for/DCB and/DCB binary systems could reach 165 and 113, respectively.
分别通过模板法和无模板法在多孔氧化铝载体上成功制备了Silicalite-1沸石膜，用于二氯苯（DCB）异构体的蒸汽渗透分离。在通过单气体渗透（He和SF）性能证明膜的高质量后，随后研究了DCB异构体在两种类型的Silicalite-1膜上的蒸汽渗透。分离结果清楚地表明，在较低分压和较高温度下，DCB异构体吸附对渗透率的影响可以保持在足够低的水平，而尖锐的选择性变得更加重要。因此，可以实现高DCB选择性。相比之下，无模板的Silicalite-1沸石由于晶间间隙相对较少，对p-DCB的选择性要高得多。在一定的分离条件下，对于p-DCB/邻二氯苯和p-DCB/间二氯苯二元体系，最高选择性分别可达165和113。
