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Hollow fibre membrane with compatible reinforcements

A fiber membrane and hollow technology, applied in fiber processing, fiber chemical characteristics, hollow filament manufacturing, etc.

Active Publication Date: 2014-08-20
BL TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

None of these methods have produced commercially available membranes

Method used

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  • Hollow fibre membrane with compatible reinforcements
  • Hollow fibre membrane with compatible reinforcements
  • Hollow fibre membrane with compatible reinforcements

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0016] refer to figure 1 , the hollow fiber membrane 10 has a membrane wall 16 . The membrane 10 may be of any size, but the structure of the membrane 10 is particularly useful for making membranes with small and thin walls relative to other reinforcing membranes. For example, membrane 10 may have an outer diameter of about 1.5 mm or less and a wall thickness of about 0.25 mm or less. The membrane 10 shown has an outer diameter of about 0.9 mm and an inner diameter of about 0.7 mm.

[0017] The membrane wall 16 has one or more bundles 12 of filaments 14 embedded therein. The filaments 14 are long continuous fibers such that at least a majority, or about 80% or more, of the filaments 14 have a length of at least one meter. When a segment of membrane 10 that is at least one meter long is loaded into a membrane module, at least a majority of filaments 14 are continuous along the entire length of the segment. Preferably, all or substantially all of the filaments 14 are continu...

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PUM

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Abstract

A process of making a reinforced hollow fiber membrane comprises flowing a membrane dope through a casting head while drawing one or more yarns or tows of filaments through the casting head. The filaments are spread apart in the casting head, for example by forcing the yarns or tows around a bend or through a narrow gap in the casting head. The filaments are adapted to bond to the membrane dope or the membrane wall. A reinforced hollow fiber membrane comprises a plurality of filaments individually surrounded by, and bonded to, the membrane wall.

Description

technical field [0001] The technical field of the invention is hollow fiber membranes, eg for providing water treatment by microfiltration or ultrafiltration. Background technique [0002] Hollow fiber membranes can be made from a variety of polymers by different methods. One method involves non-solvent-induced phase separation (NIPS) as taught in, eg, US Patent Nos. 3,615,024, 5,066,401 and 6,024,872. Another method involves thermally induced phase separation (TIPS) as taught, for example, in US Patent Nos. 4,702,836 and 7,247,238. A membrane may have a separation layer on its inner surface or on its outer surface, and may be used, for example, in microfiltration (MF) or ultrafiltration (UF). [0003] The strength of hollow fiber membranes can be increased by coating membrane dopes on preformed tubular braids. US Patents 5,472,607 and 6,354,444 to Mahendran et al. teach coating the membrane on the outside of the braid with limited penetration. US Patent 4,061,861 to Hay...

Claims

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Application Information

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IPC IPC(8): B01D69/08B01D71/34B01D71/66D01D5/24B29C48/05B29C48/08B29C48/11B29C48/30
CPCB01D2323/42B01D71/34B01D69/085B01D69/08B01D2325/40B29C48/05B29C48/08B29C48/11B29C48/919B01D71/66D01D5/24B01D69/082B01D69/087
Inventor S.K.彼得森P.L.科特白晋华
Owner BL TECH INC