Porous hollow-fiber membranes

Nakamura, M., Kiyohara, S., Saito, K. Sugita, K., and Sugo, T., High resolution of DL-tryptophan at high flow rates using a bovine serum albumin-multilayered porous hollow-fiber membrane, Anal. Chem., 71, 1323, 1999. 

Liquid-liquid extraction of hydrophobic oil-laden surfactant solution was evaluated using counter-flow, porous hollow fiber membranes. Our liquid-liquid extraction experiments were conducted using Liqui-Cel Extra-Flow 2.5x8 Membrane Contactor purchased from Celgard LLC (Charlotte, NC). The dimensions of the column are 6.3 cm diameter and 20.3 cm. length with... 

Table V], The results for the liquid-liquid extraction via continuous counter-flow through porous hollow fiber membranes.

Preparation of Porous Hollow Fiber Membranes by Extrusion... 

FigvirelZ Preparation scheme of a BSA-mullilayered porous hollow-fiber membrane. 

A DEA group was appended onto a polyethylene porous hollow-fiber membrane with a density of 2.2 mmol per gram of the resultant DEA-EA fiber. The inner and outer diameters of the hollow fiber were 2.4 and 4.4 mm, respectively. The liquid permeability, i.e., the permeation rate per unit of inside surface area, of the DEAEA fiber for the buffer was maintained at 50% of that of the original hollow fiber. Volume swelling of the porous hollow fiber accompanied by graft polymerization prevented the graft chains from filling the pores. 

The BS Amultilayer-adsorbed porous hollow-fiber membrane was mounted ona single hollow-fiber module, as showninFigure 13. The module size was 5 mm in inner diameter and 40 mm in effective length. The module was incorporated into a liquid chromatography system. A... 

The separation factor was determined at various flow rates of the mobile phase ranging from 0.3 to 3 mL/min, i.e., the residence times ranged from 4.6 to 46 s in the BS A-multilayer-adsorbed porous hollow-fiber membrane. As a result, the separation factor was constant... 

Figure 14 Qiiial separation of DL-tryptophan during the permeation of a racemic solution through a BSA-multilayered porous hollow-fiber membrane.

First, a commercially available porous hollow-fiber membrane was used as a trunk polymer for grafting. This hollow fiber had iimer and outer diameters of 1.2 and 2.2 mm, respectively, with ana verage pore diameter of 240 nm and a porosity of 70%. The trunk polymer wa s irradiated with anelectronbeamata dose of 200 kGy and immersed in... 

The conversions were calculated as activities according to equation (6), and are shown in F igure 17. A much higher activity of 4.1 mol/LAi was realized using the aminoacylase-immobilized porous hollow-fiber membrane at SV of up to 200 h because Ac-DL-Met as a substrate was transported by convective flow through the pores to a neighboring enzyme captured by the graft chain in multilayers. In addition, a membrane thickness of about 1 mm enabled a lower flow resistance of the substrate solution than in the bead-packed bed. 

The membrane of a hollow-fiter form is a convenient polymeric material in that expansion from a laboratory to a plant scale can be carried out simply by bundling the hollow fibers into a hollow-fiber membrane module [14,15]. The phenomenon of multilayer binding of the enzymes into the polymer chains grafted onto the porous hollow-fiber membrane is applicable to other enzymatic reactions at a high throughput. 

U) Various shapes of trunk polymers can be supplied in response to the demanded functionality adsorbents based on porous hollow-fiber membranes and nonwoven fabrics enaWe high-speed recovery of target molecules and ions by utilizing convective flows through the pores of the membranes and among the fibers, respectively. 

Comparison of Protein Adsorption Anion-Exchange Interaction onto Porous Hollow-Fiber Membrane and Gel Bead-Packed Bed, J. Membrane Sci.,... 

N. Kubota, Y. Konno, S., K. Saito, K. Sugita, K. Watanabe and T. Sugo, Module Performance of Anion-Exchange Porous Hollow-Fiber Membranes for High-Speed Protein Recovery, J. Chromatogr. A, 782 (1997) 159. 

Koguma, M. Nakamura, K. Saito, K. Sugita, S. Kiyohara and T. Sugo, Chiral Separation of DL-Tryptophan Using Bovine-Serum-Albumin-Multilayered Porous Hollow-Fiber Membrane, Kagaku Kogaku Ronbunsyu, 24 (1998) 458. 

Sulf onation of Glyddyl Methacrylate onto Porous Hollow-Fiber Membrane with Different Pore Sizes, Radiat. Phys. Chem., 57 (2000) 167. 

Olefins. Facilitated transport of olefins has also been reported in the literature. LeBlanc et al. (2 ) studied ethylene transport using a silver Ion carrier in an Ion exchange membrane. Hughes et al. (23) presented the results of a bench and pilot scale study of ethylene and propylene transport using a silver ion Immobilized In anisotropic, porous hollow fiber membranes. This work is very significant because it is the first report facilitated transport membranes used on a commercial scale. Teremoto et al. (24) also studied ethylene transport with a silver ion carrier in a supported liquid membrane. They found a selectivity for ethylene over ethane of approximately 1000 when the silver nitrate concentration was 4 mol/ dm. ... 

Tsuneda, S., Saito, K., Furusaki, S. et al. 1992. Water/acetone permeability of porous hollow-fiber membrane containing diethylamino groups on the grafted polymer branches. J Membr Sci. 71 1-12. 

It should be mentioned tiiat die modem technology of gas separation on porous hollow-fiber membranes requires small amounts of a supported polymeric material, which holds promise for die practical use of comparatively expensive polysihnediylenes and potysiltrimethylenes. 

LLE, liquid-liquid extraction MAE, microwave-assisted extraction SEE, solid-phase extraction SPME, solid-phase microextraction LPME, liquid-phase microextraction SOME, single-drop microextraction D-LLLME, dynamic liquid-liquid-liquid microextraction SEE, supercritical fluid extraction MIP, molecularly imprinted polymers sorbent SPMD, device for semipermeable membrane extraction PDMS, polydimethylsiloxane coated fiber PA, polyacrylate coated fiber CW-DMS, Carbowax-divinylbenzene fiber PDMS-DVB, polydimethylsiloxane divinylbenzene fiber CAR-PDMS, Carboxen-polydimethylsiloxane coated fiber DVB-CAR-PDMS, divinylbenzene Carboxen-polydimethylsiloxane coated fiber CW-TPR, Carbowax-template resin HS-SPME, headspace solid-phase microextraction MA-HS-SPME, microwave-assisted headspace-solid-phase microextraction HEM, porous hollow fiber membrane PEl-PPP, polydydroxylated polyparaphenylene. 

He, T., Mulder, M.H.V Wessling, M. (2003) Preparation of porous hollow fiber membranes with a triple-orifice spinneret. Journal of Applied Polymer Science, 87 (13), 2151-2157. 

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