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1. WO2020201475 - FLUE GAS FILTRATION MEDIA

Publication Number WO/2020/201475
Publication Date 08.10.2020
International Application No. PCT/EP2020/059493
International Filing Date 03.04.2020
IPC
B01D 39/16 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
39Filtering material for liquid or gaseous fluids
14Other self-supporting filtering material
16of organic material, e.g. synthetic fibres
CPC
B01D 2239/065
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
2239Aspects relating to filtering material for liquid or gaseous fluids
06Filter cloth, e.g. knitted, woven non-woven; self-supported material
065More than one layer present in the filtering material
B01D 2239/086
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
2239Aspects relating to filtering material for liquid or gaseous fluids
08Special characteristics of binders
086Binders between particles or fibres
B01D 2239/10
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
2239Aspects relating to filtering material for liquid or gaseous fluids
10Filtering material manufacturing
B01D 2239/1216
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
2239Aspects relating to filtering material for liquid or gaseous fluids
12Special parameters characterising the filtering material
1216Pore size
B01D 2239/1225
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
2239Aspects relating to filtering material for liquid or gaseous fluids
12Special parameters characterising the filtering material
1225Fibre length
B01D 2239/1233
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
2239Aspects relating to filtering material for liquid or gaseous fluids
12Special parameters characterising the filtering material
1233Fibre diameter
Applicants
  • AHLSTROM-MUNKSJÖ OYJ [FI]/[FI]
Inventors
  • SHIM, Jesse
  • LEE, Taylor
  • PARK, James
  • JEON, Matthew
  • CHO, Chan
Agents
  • MARTURANO, Pasqualino
Priority Data
62/829,82705.04.2019US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) FLUE GAS FILTRATION MEDIA
(FR) MILIEU DE FILTRATION DE GAZ DE COMBUSTION
Abstract
(EN)
Disclosed is a filter medium useful for flue gas filtering that comprises a non-woven fibrous web having at least 80 weight percent of meta-aramid fibers and from 0.1 to 20 weight percent of meta-aramid fibrids, based on weight of fibers and fibrids. The non-woven fibrous web can have average pore size of 20 to 80 micrometers, maximum pore size of 100 micrometers, dry Mullen burst strength of at least 7 kg/cm2, retention of 80% of the dry Mullen burst strength after acid cycling, a filtration efficiency of at least 95% for 2.5 micron particle, and/or a shrinkage of less than 2% after being heated in a dry oven at 205 °C for 2 hours. A method of making the filter medium comprises wet-laying a furnish of the meta-aramid fibers and the meta-aramid fibrids; drying to form the non-woven fibrous web; preferably, calendering; and optionally saturating with binder resin and curing.
(FR)
L'invention concerne un milieu filtrant utile pour le filtrage de gaz de combustion qui comprend une bande fibreuse non tissée ayant au moins 80 pour cent en poids de fibres méta-aramides et de 0,1 à 20 pour cent en poids de fibrides méta-aramides, sur la base du poids des fibres et fibrides. La bande fibreuse non tissée peut avoir une taille de pore moyenne de 20 à 80 micromètres, une taille de pore maximale de 100 micromètres, une résistance à l'éclatement de Mullen sec d'au moins 7 kg/cm2, une rétention de 80 % de la résistance à l'éclatement de Mullen sec après cyclage acide, une efficacité de filtration d'au moins 95 % pour une particule de 2,5 microns, et/ou un retrait inférieur à 2 % après avoir été chauffé dans un four à sec à 205 °C pendant 2 heures. Un procédé de fabrication du milieu filtrant comprend la pose par voie humide d'une composition de fabrication des fibres méta-aramides et des fibrides méta-aramides; le séchage pour former la bande fibreuse non tissée; de préférence, le calandrage; et facultativement la saturation avec la résine liante et le durcissement.
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