Antimicrobial composite filtering material and method for making the same

Patent metadata

Field	Value
Publication number	US-10537838-B2
Application number	US-201715847134-A
Country	US
Kind code	B2
Filing date	Dec 19, 2017
Priority date	Dec 20, 2016
Publication date	Jan 21, 2020
Grant date	Jan 21, 2020

Abstract

A filter media having lignite-derived activated carbon, polyacrylic acid (PAA), a commercially available copper-zinc alloy, and polydiallyldimethylammonium chloride (PolyDADMAC) or Luviquat®, which is Poly[(3-methyl-1-vinylimidazolium chloride)-co-(1-vinylpyrrolidone)], combined and used as suitable replacement for TOG bituminous coal-based activated carbon, silver, and PolyDADMAC. Functional groups in lignite-based activated carbon interact with the polyacrylic acid. Functional groups such as calcium, iron, or aluminum oxide/hydroxide of lignite-based activated carbon interact with PAA, and help hold the PolyDADMAC in place. The additional presence of a copper-zinc alloy enhances the filter anti-microbiological performance.

First claim

Thus, having described the invention, what is claimed is:

1. A process for the production of a filter media for fluid filtration having antimicrobial properties comprising the steps of:
a) diluting polyacrylic acid in deionized water to form a diluted solution;
b) adding lignite-based powdered activated carbon to said diluted solution and blending to form a blended solution;
c) soaking said blended solution;
d) mixing a copper-zinc alloy with a wet cellulose fibrillated fiber, a heavy metal removal powder adsorbent, and a CoPET/PET polyester fiber, with said blended solution to form a resultant solution;
e) blending said resultant solution;
f) forming a paper slurry from said resultant solution; and
g) drying said paper slurry to form said filter media.

2. The process of claim 1 wherein said polyacrylic acid is diluted in deionized water at an approximate ratio of 0.5 g-11 g polyacrylic acid to 1 L of deionized water.

3. The process of claim 1 wherein said lignite-based powdered activated carbon is added to said diluted solution at a ratio of approximately 0.5 g to 8 g lignite-based powdered activated carbon to about 1 L of diluted solution.

4. The process of claim 1 wherein said lignite-based powdered activated carbon is blended with said diluted solution for approximately 3 minutes.

5. The process of claim 1 wherein said copper-zinc alloy is added to said blended solution at a ratio of 0.5 to 2 g of said copper-zinc alloy per 1 square foot of fabricated filter paper.

6. The process of claim 1 wherein said wet cellulose fibrillated fiber is added to said combined solution at an approximate ratio of 14 g to 60 g wet cellulose fibrillated fiber per 1 square foot of fabricated filter paper.

7. The process of claim 1 including treating said wet cellulose fibrillated fiber with a first flocculating agent.

8. The process of claim 7 wherein said first flocculating agent is added to said wet cellulose fibrillated fiber.

9. The process of claim 7 including adding a second flocculating agent.

10. The process of claim 9 wherein said second flocculating agent is added in a ratio of approximately 0.4 g-20 g of said second flocculating agent per 1 square foot of fabricated filter paper.

11. The process of claim 1 wherein said heavy metal removal powder (HMRP) adsorbent is combined with said blended solution at an approximate ratio of 0.6 g HMRP per 1 square foot of fabricated filter paper.

12. The process of claim 1 including forming said paper slurry on spun-bound polyester, and dried at about 250° F. for about thirty (30) minutes.

13. The process of claim 1 wherein said CoPET/PET polyester fiber is added at a ratio of approximately 1 g of said CoPET/PET polyester fiber per 1 square foot of fabricated filter paper.

Assignees

• Kx Technologies Llc

Inventors

• Wang Jinwen
• Kareem Meedia
• Kareem Rezan
• Li William
• Taylor Bruce E
• Delandra Carol
• Brigano Frank A

Classifications

• B01D2239/086

  Binders between particles or fibres · CPC title

• B01D2239/0654

  Support layers · CPC title

• B01D2239/064

  The fibres being mixed · CPC title

• C02F1/285

  using synthetic organic sorbents · CPC title

• C02F1/288

  using composite sorbents, e.g. coated, impregnated, multi-layered · CPC title