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Highly retentive polyamide hollow fiber membranes produced via controlled shrinkage

A kind of fiber membrane, polyamide technology

Active Publication Date: 2019-04-02
ENTEGRIS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, no mention is made of high retention of smaller test particles (e.g. 5nm or 25nm test particles)

Method used

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  • Highly retentive polyamide hollow fiber membranes produced via controlled shrinkage
  • Highly retentive polyamide hollow fiber membranes produced via controlled shrinkage
  • Highly retentive polyamide hollow fiber membranes produced via controlled shrinkage

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0093] Example 1 Preparation of Packed Hollow Fiber Rings.

[0094] The hollow fiber membranes were cut to a length of 10 cm. Insert both ends of the hollow fiber into a 3 cm long 1 / 4-inch OD plastic tubing to form a loop with the hollow fiber. Insert hot melt adhesive (such as used in a craft glue gun) into the plastic tube from the side of the cut fiber end until the tube is filled. Once the hot melt adhesive had cooled, about 0.5 cm from the end of the tube was cut to reveal the cross-section of the hollow fiber.

example 2

[0095] Example 2 Determination of mean bubble point (MBP).

[0096] Air was pressurized through the lumen of the filled hollow fiber loops prepared as described in Example 1, and the air flow was measured as a function of pressure. Next, the loop was immersed in low surface tension fluid HFE-7200 (3M Engineered Fluids Co. HFE-7200), and air was forced through the lumen of the fiber. Air flow is again measured against pressure. The mean bubble point (MBP) is the pressure at which the ratio of air flow of wet fibers to air flow of dry fibers is 0.5.

example 3

[0097] Example 3 Determination of isopropanol permeability.

[0098] The internal flow test was used to determine isopropanol permeability using the packed hollow fiber rings prepared according to Example 1. Figure 4is a schematic diagram of an isopropanol permeability internal flow test apparatus 6 comprising a pressurized tank 65 containing isopropanol plumbed to a hollow fiber membrane 61 packed in a tube 63 using a hot melt adhesive 62 . To perform the internal flow test, the tube 63 was inserted into the push-in connection fitting 64 and isopropanol was fed through the hollow fiber 61 at 14.2 psi from the pressurized tank 65 for a predetermined interval at a temperature of 22°C. Isopropanol flowing across the membrane was collected and measured. Calculate the isopropanol permeability from Equation 1.

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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.

Description

[0001] Related applications [0002] The right of priority to U.S. Provisional Patent Application No. 62 / 355,001, filed June 27, 2016, is hereby claimed under 35 U.S.C. §119. The disclosure of US Provisional Patent Application No. 62 / 355,001 is hereby incorporated by reference in its entirety for all purposes. technical field [0003] The present invention relates to the manufacture of polyamide hollow fiber membranes with high retention for small particles. Background technique [0004] Polyamide hollow fiber membranes have been manufactured for a variety of applications including dialysis, water filtration, and pharmaceutical and semiconductor filtration. Typically, polyamide hollow fiber membranes are made by submerged cast spinning or thermally induced phase separation (TIPS). Since polyamides are insoluble in many solvents at room temperature, strong solvents such as formic acid must be used in the immersion casting process. From a disposal standpoint, this is neith...

Claims

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Application Information

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IPC IPC(8): B01D63/02B01D69/08B01D71/56B01D61/14B01D67/00B01D69/02
CPCB01D61/14B01D63/02B01D67/0016B01D69/02B01D69/08B01D71/56B01D2325/20B01D69/081B01D69/087B01D2325/04B01D63/031
Inventor M·吴J·E·汤利K·S·郑
Owner ENTEGRIS INC
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