Web comprising fine fiber and reactive, adsorptive or absorptive particulate
Inventors
Dallas, Andrew J. • Ding, William Lefei • Joriman, Jon D. • Zastera, Dustin • Giertz, James R. • KALAYCI, VELI E. • Chung, Hoo Y.
Assignees
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Publication Number
US-10058807-B2
Publication Date
2018-08-28
Expiration Date
Abstract
The assemblies of the invention can comprise a fine fiber layer having dispersed within the fine fiber layer an active particulate material. Fluid that flows through the assemblies of the invention can have any material dispersed or dissolved in the fluid react with, be absorbed by, or adsorbed onto, the active particulate within the nanofiber layer. The structures of the invention can act simply as reactive, absorptive, or adsorptive layers with no filtration properties, or the structures of the invention can be assembled into filters that can filter particulate from a mobile fluid while simultaneously reacting, absorbing, or adsorbing materials from the mobile fluid.
Core Innovation
The invention relates to fine-fiber web and filter media that incorporate reactive, adsorptive, and/or absorptive particulate within a fiber layer and/or held in voids or pockets. The particulate includes active particulates such as activated carbon, zeolite, ion exchange resin, and TiO2 catalytic particles. The fiber layer is described as a nanofiber layer and/or a microfiber web, with separation means such as a fiber spacer or particulate spacer for distributing and holding the particulate.
The fine-fiber web and filter media are configured to provide dual-mode filtration and treatment. One mode is described as a flow-through mode that includes chemical adsorption, absorption, or reaction associated with the incorporated particulate, and the other mode is described as a flow-by mode that provides contact treatment with reduced pressure drop. The particulate and fiber structures are arranged to improve performance while controlling particulate retention and particle shedding.
Methods of forming the disclosed media include electrospinning, thermal bonding, and assembly into rolled, stacked, and/or channelized media, including spiral wound media, scrim, and multilayer structures. The media may also include particulate microsphere concepts such as Expancel microspheres and nanofiber/carbon composite structures. Performance testing is described using particle efficiency and toluene breakthrough and associated measurement concepts such as residence time, pressure drop, and a Figure of Merit (FOM).
Claims Coverage
Not explicitly described in patent.
Not explicitly described in patent.
Stated Advantages
Enables dual-mode filtration and treatment with chemical adsorption, absorption, or reaction in a flow-through mode and contact treatment in a flow-by mode.
Provides low pressure drop in the flow-by mode.
Controls particulate retention to reduce particulate shedding.
Documented Applications
Filtering and treating contaminated media using the disclosed reactive, adsorptive, and absorptive particulate in the fine-fiber web, with evaluation by particle efficiency and toluene breakthrough.
Use of the disclosed media in channelized, spiral wound, and multilayer structures for particulate filtration and chemical treatment.
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