Hollow fibres
A hollow fibre containing one or more layers having a mean pore size in one or more of said layers of less than 100μm. The invention also extends to a method for preparing porous hollow fibres and to the apparatus for preparing said fibres.
1. An organic hollow fibre comprising a polymer; a binder; and an inorganic adsorbent material, wherein the inorganic adsorbent material is present at a level greater than 65 wt. %; and wherein the fibre has a flexibility greater than 5° bending angle from the midpoint of the fibre.
2. The organic hollow fibre of claim 1 wherein the polymer is selected from the group consisting of PESF, polysulfone, polyvinylidenefluoride (PVDF), polyethylene, polypropylene, poly(phenylene oxide), polyrnethylmethacrylate, poly(vinyl chloride), Polysulfone, Poly(ether sulfone), Poly(vinylidene fluoride), Polyacrylonitrile, Cellulose acetate, Polymide Poly(ether imide). Polyamide (aromatic), Polyimide, Poly(ether imide) and poly(vinyl alcohol) co-polymers of Polylactide (PLA) and Polyglycolide (PGA), Polycaprolactone (PCL) and Poly (ethylene terephathalate) (PET).
3. The organic hollow fibre of claim 1 , wherein the inorganic adsorbent material is a zeolite.
4. The organic hollow fibre of claim 3 , wherein the zeolite is a high silica zeolite.
5. The organic hollow fibre of claim 1 , wherein the hollow fibre has an additional thin outer coating.
6. The organic hollow fibre of claim 5 , wherein the outer coating is of the same composition as the hollow fibre.
7. The organic hollow fibre of claim 5 , wherein the outer coating is of a different composition than the hollow fibre.
8. The organic hollow fibre of claim 5 , wherein the outer coating is a high purity polymer.
9. The organic hollow fibre of claim 1 , wherein the hollow fibre comprises two or more layers.
10. The organic hollow fibre of claim 9 , wherein the hollow fibre is a double-layer fibre.
11. The organic hollow fibre of claim 9 , wherein the hollow fibre is a triple-layer fibre.
12. The organic hollow fibre of claim 9 , wherein the two or more layers are of the same composition.
13. The organic hollow fibre of claim 9 , wherein the two or more layers are of different compositions.
14. The organic hollow fibre of claim 13 , wherein the different compositions have different functionality.
15. The organic hollow fibre of claim 1 , wherein the fibre has a mechanical strength of greater than 200g force at a crosshead speed of 1.0 mm/sec for a fibre with an effective surface porosity of 0.1-0.2, as calculated from Knudsen flow method.
16. The organic hollow fibre of claim 1 , wherein the fibre has an area to volume ratio greater than 1000 m 2 /m 3 .
17. The organic hollow fibre of claim 1 , wherein the fibre is produced by a single stage process which does not include a firing step.