Fabrication of defect-free Matrimid® asymmetric membranes and the elevated temperature application for N2/SF6 separation

被引:22
作者
Dai, Yan [1 ]
Li, Qing [1 ]
Ruan, Xuehua [1 ]
Hou, Yong [1 ]
Jiang, Xiaobin [1 ]
Yan, Xiaoming [1 ]
He, Gaohong [1 ]
Meng, Fanqing [2 ]
Wang, Zhiyu [2 ]
机构
[1] Dalian Univ Technol Panjin, State Key Lab Fine Chem, Sch Petr & Chem Engn, Liaoning Prov Engn Lab Petrochem Separat Technol, Panjin 124221, Peoples R China
[2] Henan Pinggao Elect Co, Environm Protect Dept, Pingdingshan 467001, Peoples R China
基金
中国国家自然科学基金;
关键词
Gas membrane separation; N-2/SF6; mixture; Defect-free selective layer; Elevated temperature operation; Matrimid (R) polyimide; HOLLOW-FIBER MEMBRANES; GREENHOUSE GASES SF6; PHASE INVERSION; POLYSULFONE MEMBRANES; MIXTURES; PERFORMANCE; RECOVERY; TRANSPORT; REPLACE; WET;
D O I
10.1016/j.memsci.2019.01.050
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
N-2/SF6 mixtures have been widely used in gas-insulated equipment. Highly efficient separation approaches are urgently required to recycle SF6 from the mixtures during equipment maintenance. Gas separation with glassy polymeric membranes is regarded as a promising approach due to the great size difference between SF6 and N-2 molecules. However, the common membranes are quite low permeable for N-2/SF6 mixtures. In this research, the dry-wet phase inversion was customized with sectionalized air gap, i.e., dried air at upper section and humidified air at lower section, to manufacture Matrimid (R) asymmetric membranes in bulk with an ultrathin and defect-free selective layer. After optimization, the defect-free selective layer could be thinned to 80 nm. The pure gas test at 25 degrees C revealed that J(N2) was increased to 2.58 GPU, and alpha(N2/SF6) was approximately 41, very close to the value in the literature [J. Membr. Sci., 2014, 452, 311]. Without the restriction from the usual PDMS coating layer for defect-blocking, the elevated temperature operation was able to be employed to further enhance gas permeation. At 128 degrees C, the selectivity alpha(N2/SF6) was maximized to 115, and the relevant J(N2) is 9.0 GPU. At 200 degrees C, the temperature close to the allowable upper limit, J(N2) was increased to 15.9 GPU, and the relevant alpha(N2/SF6) was 97. Furthermore, the mixed-gas test demonstrated the favorable long-term stability of the customized membranes, even under the extreme running condition with pressure up to 2.0 MPaG and temperature up to 200 degrees C. With high efficiency and throughput under elevated temperature operation mode, the Matrimid (R) asymmetric membrane with ultrathin and defect-free selective layer is a promising approach for the separation and recycle of SF6 from the N-2/SF6 mixtures.
引用
收藏
页码:258 / 265
页数:8
相关论文
共 47 条
[21]   Separation of greenhouse gases (SF6, CF4 and CO2) in an industrial flue gas using pilot-scale membrane [J].
Lee, Soonjae ;
Choi, Jae-Woo ;
Lee, Sang-Hyup .
SEPARATION AND PURIFICATION TECHNOLOGY, 2015, 148 :15-24
[22]   Separation of sulfur hexafluoride (SF6) from ternary gas mixtures using commercial polysulfone (PSf) hollow fiber membranes [J].
Lee, Soonjae ;
Lee, Jong Suk ;
Lee, Minwoo ;
Choi, Jae-Woo ;
Kim, Sunghyun ;
Lee, Sanghyup .
JOURNAL OF MEMBRANE SCIENCE, 2014, 452 :311-318
[23]   Facilitated transport by hybrid POSS®-Matrimid®-Zn2+ nanocomposite membranes for the separation of natural gas [J].
Li, Fuyun ;
Li, Yi ;
Chung, Tai-Shung ;
Kawi, Sibudjing .
JOURNAL OF MEMBRANE SCIENCE, 2010, 356 (1-2) :14-21
[24]   SF6-alternative gases for application in gas-insulated switchgear [J].
Li, Xingwen ;
Zhao, Hu ;
Murphy, Anthony B. .
JOURNAL OF PHYSICS D-APPLIED PHYSICS, 2018, 51 (15)
[25]   Superior gas separation performance of dual-layer hollow fiber membranes with an ultrathin dense-selective layer [J].
Li, Yi ;
Chung, Tai-Shung ;
Xiao, Youchang .
JOURNAL OF MEMBRANE SCIENCE, 2008, 325 (01) :23-27
[26]   Asymmetric TPX membranes with high gas flux [J].
Lin, FC ;
Wang, DM ;
Lai, JY .
JOURNAL OF MEMBRANE SCIENCE, 1996, 110 (01) :25-36
[27]   Tuning the Free Volume Cavities of Polyimide Membranes via the Construction of Pseudo-Interpenetrating Networks for Enhanced Gas Separation Performance [J].
Low, Bee Ting ;
Chung, Tai Shung ;
Chen, Hongmin ;
Jean, Yan-Ching ;
Pramoda, Kumari Pallathadka .
MACROMOLECULES, 2009, 42 (18) :7042-7054
[28]   Gas Permeation Properties, Physical Aging, and Its Mitigation in High Free Volume Glassy Polymers [J].
Low, Ze-Xian ;
Budd, Peter M. ;
McKeown, Neil B. ;
Patterson, Darrell A. .
CHEMICAL REVIEWS, 2018, 118 (12) :5871-5911
[29]   Atmospheric SF6:: Trends, sources, and prospects [J].
Maiss, M ;
Brenninkmeijer, CAM .
ENVIRONMENTAL SCIENCE & TECHNOLOGY, 1998, 32 (20) :3077-3086
[30]   Elementary prediction of gas permeability in glassy polymers [J].
Minelli, Matteo ;
Sarti, Giulio C. .
JOURNAL OF MEMBRANE SCIENCE, 2017, 521 :73-83