Morphologically enhanced, adsorbent filter media

Patent metadata

Field	Value
Publication number	US-2024382886-A1
Application number	US-202318320083-A
Country	US
Kind code	A1
Filing date	May 18, 2023
Priority date	May 18, 2023
Publication date	Nov 21, 2024
Grant date	—

Abstract

Filter media comprising surface-treated fiber webs having one or more advantageous physical properties are generally described. Certain improvements in the surface-treated fiber webs described herein may be realized in filter media comprising adsorbent particles. The improvements herein are, in some embodiments, related to favorable distributions of cavities in surface-treated fiber webs, such as those used in backers of the filter media.

First claim

1 . A filter media, comprising:
a fiber web comprising a plurality of surface cavities, wherein:
the synthetic fibers of the fiber web have an average length of less than or equal to 40 mm,
the fiber web has a developed interfacial area ratio greater than or equal to 0.1, and
the cavities of the fiber web have an average cross-dimensional frequency of greater than or equal to 3,000 surface cavities per meter; and
a plurality of adsorbent particles disposed on the fiber web.

2 . A filter media as in claim 1 , wherein the filter media comprises a plurality of adsorbent particles disposed on the nonwoven fiber web.

3 . A filter media as in claim 1 , wherein the fiber web is non-woven.

4 . A filter media according to claim 1 , wherein the intermediate and large cavities of the plurality of cavities together have an average area of less than or equal to 500 microns 2 .

5 . A filter media according to claim 1 , wherein the large cavities of the plurality of cavities have an average area of less than or equal to 1300 microns 2 .

6 . A filter media according to claim 1 , wherein the matrix polymer comprises only polymers with a molecular weight of greater than 3 kDa.

7 . A filter media according to claim 1 , wherein the plurality of adsorbent particles is a plurality of carbon particles.

8 . A filter media according to claim 1 , wherein the adsorbent particles are at least partially disposed within the cavities of the plurality of cavities.

9 . A filter media according to claim 1 , wherein the fiber web is a first layer of the filter media, and the adsorbent particles form a second layer disposed on top of the first layer.

10 . A method of making the filter media of claim 1 , comprising first preparing a precursor fiber web and fluid enhancing the precursor fiber web to produce the fiber web of any preceding claim .

11 . The method of claim 10 , further comprising depositing a layer on the fiber web.

12 . A filter media according to claim 1 , further comprising an additional layer at least partially disposed on the fiber web.

13 . A filter media according to claim 1 , wherein the additional layer comprises a fiber web.

14 . A filter media according to claim 1 , wherein the fiber web of the additional layer comprises a plurality of glass fibers.

15 . A filter media according to claim 1 , wherein at least some adsorbent particles are disposed within the fiber web.

Assignees

• Hollingsworth & Vose Co

Inventors

• Jinka Sudheer
• Yegya Raman Praveen Kumar
• Witsch James M

Classifications

• B01D2239/064

  The fibres being mixed · CPC title

• B01D39/18

  the material being cellulose or derivatives thereof ({cork or peat B01D39/1646} ; making filter paper D21F11/14) · CPC title

• B01D2239/086

  Binders between particles or fibres · CPC title

• B01D2239/1233

  Fibre diameter · CPC title

• B01D2239/0618

  Non-woven · CPC title