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Membranes

Patent Abstracts

From 08/25/2014 through 5/23/2012

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Patent Abstracts

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Patents with Abstracts

8,496,122 
Permselective membrane and process for manufacturing thereof

Permselective asymmetric hollow fiber membrane are used for, hemodialysis, hemofiltration and hemodiafiltration as well as water purification or dehydration.

Gohl ans Buck of Gambro Lundia, Sweden, developed a a permselective asymmetric hollow fiber membrane for hemodialysis containing a hydrophobic polymer and a hydrophilic polymer. The outer surface of the hollow fiber has pores in the range of 0.5-3 microns and the numbers of said pores in the outer surface are in the range of 20,000 to 100,000 pores per mm2. Their process is a solvent phase inversion spinning process of the two different polymer in a single solvent.  The solution is extruder through a nozzle with two concentric openings.  The outside of the precipitating fiber is exposed to a humid steam/air mixture comprising a solvent in a content of between 0.5 and 10 wt% water content.  (RDC 8/5/2013)

8,177,979 
Asymmetric nanotube containing membranes
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Ratto, Holt and  Szmodis of NanOasis Technologies, California, developed heterogenous pore polymer nanotube membranes useful in filtration, such as reverse osmosis desalination, nanofiltration, ultrafiltration and gas separation.  These membranes of selective permeability consist of porous polymers and terminating on one side in a skin, with nanotubes embedded in said membrane and protruding through said skin and said skin forming a substantially impermeable barrier around said nanotubes.  These membrane have pores increasing in diameter with increasing distance from said skin. (RDC 5/23/2012)

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Roger D. Corneliussen
Editor
www.maropolymeronline.com

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E-Mail: cornelrd@bee.net  

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Copyright 2012 by Roger D. Corneliussen.
No part of this transmission is to be duplicated in any manner or forwarded by electronic mail without the express written permission of Roger D. Corneliussen
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** Date of latest addition; date of first entry is 5/23/2012.