Dual-layer hollow fiber membranes

Husain, S. (2006). Mixed Matrix Dual Layer Hollow Fiber Membranes for Natural Gas Separation, in Chemical Biomolecular Engineering, PhD Dissertation, Georgia Institute of Technology. 

Liu, Y. Chung, T.S. Wang, R. Liu, D.F. Chng, M.L. Chemical cross-linking modification of polyimide/poly(ethersulfone) dual layer hollow fiber membranes for gas separation. Industrial Engineering Chemistry Research 2003, 42 (6), 1190-1195. 

PI materials have been used for the dehydration of water/alcohol mixtures by the pervaporation method.P84 co-PI hollow fibers and zeolite filled P84 CO-PI membranes " have been used for the pervaporation dehydration of isopropanol. In addition, P84 co-PI based dual-layer hollow fiber membranes serve for the dehydration of tetrafluoropropanol. ... 

K. Y. Wang, T.-S. Chung, and R. Rajagopalan. Dehydration of tetrafluoro-propanol (TFP) by pervaporation via novel PBI/BTDA-TDI/MDI co-poly-imide (P84) dual-layer hollow fiber membranes. J. Membr. Sci., 287(1) 60-66, January 2007. 

Dual layer hollow fiber membranes have become increasingly attractive due to which they can be fabricated in a single step using the non-solvent induced phase inversion method. A good lamination between the two layers as well as a regular morphology are critical to get a functional hollow fiber membrane [80]. 

Setiawan L, Shi L, Krantz WB, Wang R. Explorations of delamination and irregular structure in poly(amide-iniide)-polyethersulfone dual layer hollow fiber membranes. J Membr Sci 2012 423 24 73-84. 

Setiawan L, Wang R, Tan S, Shi L, Fane AG. Fabrication of poly(amide-imide)-poly-ethersulfone dual layer hollow fiber membranes applied in forward osmosis by combined polyelectrolyte cross-Unking and depositions. Desalination 2013 312 99-106. 

Y. Wang, S.H. Goh, T.S. Chung, N. Peng, Polyamide-imide/polyetherimide dual-layer hollow fiber membranes for pervaporation dehydration of C1-C4 alcohols, J. Membr. Sci. 326 (1) (2009) 222-233. 

Effects of Posttreatment on Dual-Layer Hollow-Fiber Membranes... 

Figure 31.13 Visual estimation of the dense-selective layer thickness of dual-layer hollow-fiber membranes with different heat treatment methods (left) 15°C for 3 h and right) 150°C for 1 h. (Li et al., 2004b).

N. Widjojo, T.S. Chung, and W.B. Krantz, A morphological and structural study of Ultem/P84 copolyimide dual-layer hollow fiber membranes with delamination-free morphology. Journal of Membrane Science 294 (2007) 132-146. 

FIGURE 7.18 Distribution of nanosilica particles at the cross section of PVDF/nanosilica dual-layer hollow-fiber membranes. (Data from P. Sukitpaneenit and T.S. Chung, Ind. Eng. Chem. Res., 51, 978-993, 2012.)... 

F.Y. Li, Y. Li, T.S. Chung, H. Chen, Y.C. Jean, and S. Kawi. (2011). Development and positron aimihilation spectroscopy (PAS) characterization of polyamide imide (PAI) polyethersulfone (PES) based defect-free dual-layer hollow fiber membranes with an ultrathin dense-selective layer for gas separation, J. Memb. Sci. 378 541-550. 

N. Widjojo and T.S. Chung. (2009). Pervaporation dehydration of C2-C4 alcohols by 6FDA-ODA-NDA/Ultem dual-layer hollow fiber membranes with enhanced separation performance and swelling resistance, Chem. Eng. J. 155 736—743. 

Studies on the fabrication and use of polymeric dual-layer hollow fiber membranes through phase inversion-based co-extrusion began in the late 1970s for hemodialysis [39], In the late 1980s, Yanagimoto invented dual-layer asymmetric flat-sheet and hollow-fiber membranes to improve the antifouling properties of polymeric membranes used for water purification [40,41]. The patent disclosures about the procedures of fabricating polymeric multilayer hollow fibers for gas separation wctc made by Du Pont de... 

L. Jiang, T.S. Chung, D.F. Li, C. Cao, and S. Kulprathipanja, Fabrication of Matrimid/ polyethersulfone dual-layer hollow fiber membranes for gas separation. Journal of Membrane Science 240(1/2) (2004) 91-103. 

X. Ding, Y. Cao, H. Zhao, L. Wang, Q. Yuan, Fabrication of high performance Matrimid/ polysulfone dual-layer hollow fiber membranes for 02/N2 separation. Journal of Membrane Science, 323 (2008) 352-361. 

S.P. Sun, K.Y. Wang, N. Peng, T.A. Hatton, T.-S. Chung, Novel polyamide-imide/cellu-lose acetate dual-layer hollow fiber membranes for nanofiltration. Journal of Membrane Science, 363 (2010) 232-242. 

The need for HTPs or HTPBs is often for chemical (e.g., preventing of swelling or oxidation) and mechanical performance. For example, in the petroleum industry dual-layer hollow fiber membranes are used for separation of H2/CO2 and CO2/CH4 gases. These are prepared from solutions of 1 1 PIB/PI blend (e.g. poly[2,2 -(l,3-phenylene)-5,5 -bibenzimidazole] and poly[3,3 4,4 -benzophenone-icira-carboxylic-df-anhydride-co-5(6)-amino-l-(4 -amino-phenyl-l,3-/n-methyl-indane)]).i i The spun hollow fibers are coated by a solution of silicone rubber. The membranes had the desired microstructure. Membrane selectivity of 11.11 and 41.81 was obtained for H2/ CO2 and CO2/CH4, respectively. Furthermore, the new membranes showed good resistance toward COj-induced plasticization. Camacho-Zuniga et al. 

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