Highly retentive polyamide hollow fiber membranes produced via controlled shrinkage

Patent metadata

Field	Value
Publication number	US-2019255489-A1
Application number	US-201716312653-A
Country	US
Kind code	A1
Filing date	Jun 26, 2017
Priority date	Jun 27, 2016
Publication date	Aug 22, 2019
Grant date	—

Abstract

Described herein is a polyamide hollow fiber membrane and methods of making and using the hollow fiber membrane. The polyamide hollow fiber membrane has an isopropanol permeability of from about 5 L/m2 h bar to about 150 L/m2 h bar and a particle rejection percentage of about 100% for particles having a nominal diameter of from about 1 nm to about 25 nm. The polyamide hollow fiber membranes described herein are particularly useful for photoresist filtration, for example.

First claim

1 . A polyamide hollow fiber membrane, having an isopropanol permeability of from about 5 L/m 2 h bar to about 150 L/m 2 h bar and a particle rejection percentage of about 100% for particles having a nominal diameter of from about 1 nm to about 25 nm.

2 . The polyamide hollow fiber membrane of claim 1 , wherein the isopropanol permeability is from about 40 L/m 2 h bar to about 100 L/m 2 h bar.

3 . The polyamide hollow fiber membrane of claim 1 , wherein the isopropanol permeability is from about 5 L/m 2 h bar to about 30 L/m 2 h bar.

4 . The polyamide hollow fiber membrane of claim 1 , wherein the particle rejection percentage is about 100% for particles having a nominal diameter of from about 5 nm to about 25 nm.

5 . The polyamide hollow fiber membrane of claim 1 , having a, wherein the mean bubble point of from about 50 psi to about 150 psi.

6 . The polyamide hollow fiber membrane of claim 5 , wherein the mean bubble point is from about 70 psi to about 95 psi.

7 . The polyamide hollow fiber membrane of claim 5 , wherein the mean bubble point is from about 90 psi to about 150 psi.

8 . The polyamide hollow fiber membrane of claim 1 , wherein the polyamide is polyamide 6, polyamide 6,6, polyamide 4,6, polyamide 6,10 or polyamide 12, or a combination of any of the foregoing.

9 . The polyamide hollow fiber membrane of claim 8 , wherein the polyamide is polyamide 6.

10 . The polyamide hollow fiber membrane of claim 1 , having an outer diameter of from about 400 microns to about 1,000 microns and having an inner diameter of from about 200 microns to about 800 microns.

11 . The polyamide hollow fiber membrane of claim 1 , wherein the hollow fiber membrane has a thickness of from about 100 microns to about 250 microns.

12 . A fluid separation module, comprising:
a housing having a feed port and a permeate port; and a separation element positioned within the housing dividing the housing into a first volume and a second volume fluidly sealed from the first volume, the separation element comprising a plurality of polyamide hollow fiber membranes, each polyamide hollow fiber membrane having a first end portion and a second end portion, a lumen that is open to fluid flow and an isopropanol permeability of from about 5 L/m 2 h bar to about 150 L/m 2 h bar and a particle rejection percentage of about 100% for particles having a nominal diameter of from about 1 nm to about 25 nm, wherein the feed port is in fluid communication with the first volume and the permeate port is in fluid communication with the second volume, whereby at least a fraction of fluid fed into the feed port permeates the plurality of polyamide hollow fiber membranes and thereby forms a permeate, which flows out of the permeate port.

13 . The filtration cartridge of claim 12 , wherein the first end portion of each of the plurality of hollow fiber membranes is potted and the second end portion of each of the plurality of hollow fiber membranes is potted to form a polyamide hollow fiber bundle.

14 . The filtration cartridge of claim 13 , wherein the polyamide hollow fiber bundle is a double-ended polyamide hollow fiber bundle.

15 . The filtration cartridge of claim 13 , wherein the polyamide hollow fiber bundle is a single-ended polyamide hollow fiber bundle.

16 . (canceled)

17 . A process for producing a polyamide hollow fiber membrane open to fluid flow and having an isopropanol permeability of from about 5 L/m 2 h bar to about 150 L/m 2 h bar and a particle rejection percentage of about 100% for particles having a nominal diameter of from about 1 nm to about 25 nm, the process comprising:
forming a slurry of polyamide resin and water-soluble organic solvent; extruding the slurry through a hollow fiber spinneret into water maintained at a temperature sufficient to induce coagulation of the slurry to form a hollow fiber; extracting the water-soluble organic solvent from the hollow fiber using water to form the hollow fiber membrane; winding the hollow fiber or hollow fiber membrane onto a compressible frame; and drying the hollow fiber membrane on the compressible frame, thereby producing the polyamide hollow fiber membrane open to fluid flow.

18 . The process of claim 17 , wherein the slurry comprises from about 15% to about 25% polyamide resin by mass.

19 . The process of claim 17 , wherein the compressible frame compresses as the hollow fiber membrane wound onto the frame shrinks along its length, said compressible frame comprising: a rectangular frame; and elastomeric material positioned along opposing edges of the frame that compresses as the wound hollow fiber shrinks along its length.

20 . The process of claim 17 , wherein the compressible frame compresses as the hollow fiber membrane wound onto the frame shrinks along its length, said compressible frame comprising: a rectangular frame made from a first component and a second component, the first component and the second component movable relative to one another at a joint formed by one or more brackets in cooperation with one or more spring guides and compressive springs.

Assignees

• Entegris Inc

Inventors

• Woo Maybelle
• Townley Jeffrey E
• Cheng Kwok-Shun

Classifications

• B01D71/56

  Polyamides, e.g. polyester-amides · CPC title

• B01D69/02

  characterised by their properties · CPC title

• B01D2325/20

  Specific permeability or cut-off range · CPC title

• B01D69/08

  Hollow fibre membranes (manufacture of hollow fibres D01D5/24, D01F1/08) · CPC title

• B01D61/14

  Ultrafiltration; Microfiltration · CPC title