Polysulfone hollow fiber

A bench top polysulfone hollow fiber membrane (0.0325m ) with molecular weight cutoff (MWCO) of 30K (A/G Technology Corp., Needham MA) was used (24). UF was run in a total recycle mode at a rate of 1.2 L/min (flow speed of 0.73 m/sec), cross membrane pressure of 25 PSIG and 10 + 1°C. PE permeability is expressed as the fraction of PEU/mL in the permeate to PEU/mL in the retentate. Data presented are representative of at least duplicate replications. 

Polysulfone hollow fibers, composite, 76 17 Polysulfone membranes, 75 811 Polysulfones, 70 202-204 properties of, 70 204t Polysulfone ultrafiltration hollow-fiber membrane, 76 4 Polyfsulfonic acid)s, 23 717-725 biomedical applications of, 23 722-723 uses for, 23 717... 

Figure 12. Cross-section of the surface zone of a polysulfone hollow fiber (spun from DMF directly into water while conducting nitrogen through the lumen)...

Figure 15. Bottom surfaces (A) phos-phonylated-PPO reverse osmosis membrane (B) interior skin at lumen of the polysulfone hollow fiber shown in Figure 12.

Polysulfone hollow fiber. C Tubular. d Hollow fiber. 

Figure 11.13 The effect of replenishing a hollow fiber coupled transport module with fresh complexing agent. Membrane, polysulfone, hollow fiber/Kelex 100 feed, 0.2 % copper, pH 2.5 product, 2% copper, 100 g/L H2S04 [49]...

Sharpe, I. D., Ismail, A. F., and Shilton, S. J. (1999), A study of extrusion shear and forced convection residence time in the spinning of polysulfone hollow fiber membranes for gas separation, Sep. Purif. Technol, 17,101-109. 

Figure 34.19 Variation of (a) oxygen enrichment factors and (b) air flux constants as a function of plasma polymer coating thickness, perfluro-1-methyldecalin plasma polymer coatings deposited onto porous polysulfone hollow fibers at A 5.35 x 10 J/kg 6.64 X 10 J/kg and 8.05 x 10 J/kg.

Fliguchi A, Iwata N, and Nakagava T. Surface-modified polysulfone hollow fibers. II. Fibers having CH2CH2CH2SO3" segments and immersed in HCI solution. J. Appl. Polym. Sci. 1990 40 109-111. 

Klein E, Eichholz E, and Yeager D. Affinity membranes prepared from hydrophiUc eatings on microporous polysulfone hollow fibers, J. Membr. Sci. 1994 90 69-80. 

Cunha et al. [79] noted an increase in the titratable acidity with increasing concentration factor (from 1.2 to 1.8) in the UF of semi-skimmed milk (1.33% fat) using 10 kDa MWCO Romicon polysulfone hollow fiber membrane at 50°C. They explained that this result is mostly due to the protein concentration, which increased the apparent acidity of the retentates and promoted an increase in its buffering capacity. When the UF retentates were made into reduced-fat Minas Frescal cheese, they noted a decrease in yield with increasing concentration factor, due to the decrease in moisture content. 

PSF membrane supported by polysulfone hollow fibers. PA membrane suiqiorted by polyamide hollow fibers. 

Liver Acute liver failure Porcine hepatocytes Polysulfone hollow fiber Extracorporeal support device Detoxification activity, bridge-to-transplantation [20]... 

Studies of the plasma polymerization of tetrafluoroethylene in such a capacltively coupled system are described in another paper presented at this symposium [ 9]. The apparatus has been used to coat polysulfone hollow fibers with pyridine and acetylene + nitrogen plasma polymer to form a composite reverse osmosis desalination membrane. Salt rejections of 90-93% have been achieved at fluxes of 1.5-2.0 g.f.d with a fiber take up rate of 50-100 cm/min. 

Polysulfone hollow fibers are usually asymmetric in cross-section, with either an internal skin (for use in blood filtration) or an external skin (for use in gas separation). The ability to form asymmetric structures with divergent permeabilities attributable to the skin and supporting structures makes glassy polymers, such as the polysulfones, attractive for use in the development of separation devices. In contrast to membranes having a uniform cross-section, these asymmetric structures permit much higher filtration rates with equivalent sieving spectra. 

Figure 1 Asymmetric macrovold-free polysulfone hollow fiber [The fiber was spun with bore off-center to detect irregularities In the substructure ( 5)].

Figure 2 Cross-section of asymmetric polysulfone hollow fiber.

A schematic and an equipment diagram of the membrane recovery system are shown in Figures 2a and 2b. The cell separation step consisted of two stages a cell concentration step in which a five fold volume reduction of the cell broth was done, and a cell wash (or diafiltration) step in which four volumes of a salt solution were pumped into the cell concentrate at a rate equal to the permeate flow rate to wash out residual enzyme. These two steps were done using the same membrane system two 23 square foot, 500,000 MWCO (1.0 mm ID) polysulfone hollow fiber units (AG Technology (Needham, MA), Catalog UFP-500-E- 55). Though considered ultrafilters... 

Figure 10a. Summary of Membrane Cleaning Results Water Permeability Data for AG Technology 500,000 MWCO Polysulfone Hollow Fibers...

Based on measurements of water flux data, the polysulfone hollow fibers proved difficult to clean. Flux recovery from run to run was inconsistent, and the membrane occasionally required extra effort to clean. 

Figure 9.25 The effect of feed solution flow velocity on coupled transport metal flux. The product solution flow was held constant at 0.06 cm/sec.20 (Membrane Polysulfone hollow fiber/Kelex 100. Feed 0.2% copper, pH 2.5. Product 2% copper, 100 g/C H2S04).

Figure 9.33 Scanning electron micrographs of a polysulfone hollow fiber as a coupled transport support membrane.19...

---