DE4241605A1 - High air permeability filter system - has coarsely porous absorption section followed by finely porous absorption section. - Google Patents

High air permeability filter system - has coarsely porous absorption section followed by finely porous absorption section.

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Publication number
DE4241605A1
DE4241605A1 DE19924241605 DE4241605A DE4241605A1 DE 4241605 A1 DE4241605 A1 DE 4241605A1 DE 19924241605 DE19924241605 DE 19924241605 DE 4241605 A DE4241605 A DE 4241605A DE 4241605 A1 DE4241605 A1 DE 4241605A1
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Prior art keywords
filter system
adsorber
support
air permeability
absorption section
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DE19924241605
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German (de)
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Hasso Von Bluecher
Ernest De Dr Ruiter
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
    • B01D53/0407—Constructional details of adsorbing systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B01D39/1669—Cellular material
    • B01D39/1676—Cellular material of synthetic origin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10—Inorganic adsorbents
    • B01D2253/102—Carbon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10—Inorganic adsorbents
    • B01D2253/106—Silica or silicates
    • B01D2253/108—Zeolites
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10—Inorganic adsorbents
    • B01D2253/112—Metals or metal compounds not provided for in B01D2253/104 or B01D2253/106
    • B01D2253/1122—Metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/20—Organic adsorbents
    • B01D2253/202—Polymeric adsorbents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/25—Coated, impregnated or composite adsorbents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/30—Physical properties of adsorbents
    • B01D2253/302—Dimensions
    • B01D2253/304—Linear dimensions, e.g. particle shape, diameter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/30—Physical properties of adsorbents
    • B01D2253/302—Dimensions
    • B01D2253/306—Surface area, e.g. BET-specific surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/30—Physical properties of adsorbents
    • B01D2253/302—Dimensions
    • B01D2253/31—Pore size distribution
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/30—Physical properties of adsorbents
    • B01D2253/302—Dimensions
    • B01D2253/311—Porosity, e.g. pore volume
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/40—Further details for adsorption processes and devices
    • B01D2259/414—Further details for adsorption processes and devices using different types of adsorbents
    • B01D2259/4141—Further details for adsorption processes and devices using different types of adsorbents within a single bed
    • B01D2259/4145—Further details for adsorption processes and devices using different types of adsorbents within a single bed arranged in series
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
    • B01D53/0407—Constructional details of adsorbing systems
    • B01D53/0446—Means for feeding or distributing gases

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Separation Of Gases By Adsorption (AREA)

Abstract

A high air permeability filter system consists of a three-dimensional porous support with absorbent particles adhering to its walls and bridging portions, the novelty being that either (a) a first section, consisting of a coarsely porous support with large absorbent particles, and a second section, consisting of a finely porous support with small absorbent particles, and provided; or (b) several sections are provided, having support structures of decreasing pore diameter and decreasing absorbent particle size in the flow direction. Pref. the support structure is reticulated polyurethane foam. USE/ADVANTAGE - As an absorption or chemisorption filter for gases. The system combines the high absorption capacity of the coarsely porous filter section with the low initial break-through and excellent absorption kinetics of the finely porous filter section.

Description

In der DE 38 13 563.9 A1 wird ein Adsorptionsfilter beschrieben, bei welchem kleine Adsorberteilchen auf einer dreidimensionalen Trägermatrix befestigt sind. Es wird damit höchste Wirksamkeit bei sehr niedrigem Strömungswider­ stand erreicht.DE 38 13 563.9 A1 describes an adsorption filter in which small adsorber particles attached to a three-dimensional carrier matrix are. It becomes the highest effectiveness with very low flow resistance reached.

Die DE 37 19 418.6 C1 beschreibt ein Filtermaterial, bei welchem ein großpo­ riger retikulierter PUR-Schaum zuerst mit großen und danach mit kleinen Ad­ sorbern beladen wird, die die Zwischenräume zwischen den großen Adsorbern einnehmen.DE 37 19 418.6 C1 describes a filter material in which a large po Reticulated PUR foam first with a large and then with a small ad sorber is loaded, the spaces between the large adsorbers take in.

Die DE 39 25 693 A1 beschreibt ein ähnliches System, jedoch mit dem Unter­ schied, daß die großen Teilchen stärkere Adsorptionskräfte entwickeln als die kleinen. In beiden Fällen wird bezweckt, daß die kleinen Teilchen dank ihrer großen (äußeren) Oberfläche für eine schnelle Adsorption sorgen, anschlie­ ßend aber das Adsorbat in den "Pausen" an die großen abgeben, um wieder verfügbar zu sein. Die Praxis hat aber gezeigt, daß solche Systeme bei Dauer­ belastung nicht die erwartete Leistung bringen, da die kleinen Teilchen sehr schnell abgesättigt werden.DE 39 25 693 A1 describes a similar system, but with the sub decided that the large particles develop stronger adsorption forces than that small. In both cases the purpose is that the small particles, thanks to their large (outer) surface for rapid adsorption, then but the adsorbate in the "breaks" to the big ones to give back to be available. Practice has shown, however, that such systems last Do not perform as expected due to the small particles are quickly saturated.

In der DE 41 01 658.0 wird vorgeschlagen, die Porendurchmesser der Adsor­ bentien in Strömungsrichtung zu vermindern, um zuerst höher siedende, dann niedriger siedende Stoffe abzufangen. Derartige gestaffelte Filter haben sich immer dann bewährt, wenn Dämpfe sehr unterschiedlicher Adsorbierbarkeit vorliegen, bzw. wenn das Hauptfilter gegen Hochsieder, die von feinporigen Adsorbentien kaum desorbiert werden können, geschützt werden soll. Die Ver­ hältnisse sind anders, wenn kleine bis mittlere Mengen flüchtiger Substanzen (etwa im Bereich 10-1000 ppm) während längerer Zeit aus einem Luftstrom bei hohen Strömungsgeschwindigkeiten entfernt werden sollen. Bei den - bei­ spielsweise in der DE 38 13 563.9 - beschriebenen Systemen steht man vor nicht miteinander in Einklang zu bringenden Forderungen. Um einen verhält­ nismäßig geringen Druckabfall zu haben, sollen die Öffnungen in der Träger­ matrix groß sein - beispielsweise ein großporiger retikulierter Schaum. Das be­ dingt aber eine ziemlich lange Massenübergangszone, weil die Wahrschein­ lichkeit (insbesondere bei hohen Strömungsgeschwindigkeiten), daß Moleküle nicht mit einem Adsorbensteilchen zusammenstoßen, nicht unbedeutend ist. Grundsätzlich läßt sich die Adsorptionskinetik durch Verwendung sehr kleiner Teilchen verbessern, allerdings nur zu Lasten der Kapazität.DE 41 01 658.0 proposes the pore diameter of the adsorber bentien to decrease in the direction of flow, first to higher boiling, then intercept lower boiling substances. Such staggered filters have become always proven when vapors of very different adsorbability are present, or if the main filter against high boilers, that of fine-pored Adsorbents can hardly be desorbed, should be protected. The Ver Ratios are different when small to medium amounts of volatile substances (around 10-1000 ppm) from a stream of air for a long time should be removed at high flow rates. With the - with  for example in systems described in DE 38 13 563.9 - one stands out demands that cannot be reconciled. To behave The openings in the carrier are said to have a low pressure drop be large - for example, a large-pore reticulated foam. That be but hangs a fairly long mass transition zone because the probability ability (especially at high flow rates) that molecules do not collide with an adsorbent particle, is not insignificant. Basically, the adsorption kinetics can be reduced by using very small ones Improve particles, but only at the expense of capacity.

Es wurde überraschenderweise gefunden, daß sehr gute Adsorptionsfilter er­ halten werden, wenn man einem offenporigen Filter mit relativ großen Adsor­ berteilchen ein feinporiges Filter mit kleinen Adsorberteilchen nachschaltet. Wird die Anordnung umgedreht, also zuerst die feinporige Filterschicht und da­ hinter die grobporige, stellt sich sehr schnell ein zu hoher Durchbruch ein. Die Wirkungsweise ist folgende: das großporige Filterelement, welches 80-90% der gesamten Adsorbermenge enthält, fängt 90-95% der zu adsorbierenden Stoffe ab, hat also einen Anfangsdurchbruch von 5-10%, aber dieser Zustand bleibt aufgrund der hohen Kapazität über lange Zeiträume erhalten. Die fein­ porige Filterschicht enthält 10-20% der gesamten Adsorbermenge. Bei alleini­ ger Verwendung würde sich zwar ein niedriger Anfangsdurchbruch ergeben, aber wegen der geringen Kapazität käme es bald zu einem massiven Durch­ bruch.It has surprisingly been found that very good adsorption filters will hold if you have an open pore filter with a relatively large adsor a fine-pored filter with small adsorber particles. If the arrangement is reversed, first the fine-pored filter layer and there behind the coarse-pored, a breakthrough that is too high quickly arises. The The mode of operation is as follows: the large-pored filter element, which is 80-90% contains the total amount of adsorber, captures 90-95% of the adsorbed Fabrics off has an initial breakthrough of 5-10%, but this condition is retained over long periods due to the high capacity. The fine Porous filter layer contains 10-20% of the total amount of adsorber. Alleini low usage, there would be a low initial breakthrough, but because of the low capacity, there would soon be a massive through fracture.

Schaltet man nun das feinporige hinter das grobporige Filter, so ist das Ange­ bot an Schadstoffen für das feinporige Filter über einen langen Zeitraum relativ niedrig, so daß die beschränkte Kapazität nicht mehr ins Gewicht fällt; hinge­ gen kommt die ausgezeichnete Adsorptionskinetik voll zum Zuge. Es resultie­ ren über einen langen Zeitraum nur sehr niedrige Durchbrüche. Bei der be­ schriebenen Anordnung wird der Druckabfall im wesentlichen durch das fein­ porige Filter bestimmt. Einflußgrößen sind Schichtdicke, Porengröße des Trä­ gers, Teilchengröße sowie Art und Dicke der Kleberschicht, womit die Adsor­ ber zum Haften gebracht werden. Hier hat der Fachmann die Möglichkeit, die optimale Kombination zu realisieren.If you now switch the fine-pored filter behind the coarse-pored filter, that's the problem offered relative pollutants for the fine-pored filter over a long period of time low, so that the limited capacity no longer matters; depend The excellent adsorption kinetics come into their own. It results  breakthroughs over a long period of time. At the be written arrangement, the pressure drop is essentially due to the fine porous filter determined. Influencing factors are layer thickness, pore size of the Trä gers, particle size and type and thickness of the adhesive layer, with which the adsor about sticking. Here the specialist has the option of to realize the optimal combination.

In der Praxis haben sich retikulierte PUR-Schäume, die mit kugelförmigen Ad­ sorbern - sowohl Aktivkohle als auch "poröse Polymere" - beladen worden sind, gut bewährt. Typische Trägerschäume für die grobporige Filterschicht haben Porendichten von 10-15 PPI, die mit Adsorbern von 0,5-1 mm bela­ den sind, während für die feinporige Filterschicht Schäume mit ca. 40 PPI oder mehr und Kügelchen mit ⌀ 0,1 mm gut geeignet sind. Es können aber auch feinporige Schäume mit einer dünnen Paste aus vermahlenen Adsorbern, bei­ spielsweise Aktivkohle, und einer Binderdispersion imprägniert werden. Eine solche ist beispielsweise in der US 3,091,550 beschrieben. Es muß dabei be­ achtet werden, daß der Binder die Adsorberteilchen nicht einschließt.In practice, reticulated PUR foams with spherical ad sorbern - both activated carbon and "porous polymers" - have been loaded are well proven. Typical carrier foams for the coarse-pored filter layer have pore densities of 10-15 PPI, which are loaded with adsorbers of 0.5-1 mm are, while for the fine-pored filter layer, foams with approx. 40 PPI or more and beads with ⌀ 0.1 mm are well suited. But it can also fine-pored foams with a thin paste of ground adsorbers, at for example activated carbon, and a binder dispersion are impregnated. A such is described for example in US 3,091,550. It must be care is taken that the binder does not include the adsorber particles.

In vielen Fällen ist neben der reinen Adsorption auch eine Chemisorption für schwer adsorbierbare Gase erwünscht. Hierfür stehen dem Fachmann diverse imprägnierte Adsorbentien, insbesondere imprägnierte Aktivkohle, aber auch katalytisch wirksame Adsorbentien, beispielsweise mit Palladium beladene Ak­ tivkohle, zur Verfügung.In many cases, besides the pure adsorption, there is also a chemisorption for difficult to adsorb gases desired. The specialist has various options for this impregnated adsorbents, especially impregnated activated carbon, but also catalytically active adsorbents, for example Ak loaded with palladium tiv carbon, available.

Beispielexample

Ein retikulierter Polyurethan-Schaum (Litergewicht ca. 30 g, Porosität 10 Po­ ren pro inch, Dicke ca. 2 mm) wurde mit einem Gemisch, bestehend aus 1000 Teilen Impranil HS 62 und 62 Teilen Imprafix HSC (beides Produkte der Bayer AG) abgequetscht und mit Aktivkohle-Kügelchen (⌀ 0,5-0,63 mm, innere Oberfläche 1100 m2/g) bestreut. Nach Entfernung des Überschusses wurde die Haftmasse auskondensiert. Die Aktivkohle-Menge betrug 200 g/m2 (Muster 1).A reticulated polyurethane foam (liter weight approx. 30 g, porosity 10 pores per inch, thickness approx. 2 mm) was squeezed off with a mixture consisting of 1000 parts Impranil HS 62 and 62 parts Imprafix HSC (both products from Bayer AG) and sprinkled with activated carbon beads (⌀ 0.5-0.63 mm, inner surface 1100 m 2 / g). After removal of the excess, the adhesive was condensed out. The amount of activated carbon was 200 g / m 2 (sample 1).

Ein retikulierter Polyurethan-Schaum von 1,0 mm Dicke und ca. 50 PPI wurde in Anlehnung an die US 3,091,550 imprägniert und nach Aushärtung des Bin­ ders auf ca. 0,6 mm Dicke komprimiert. Die Menge Aktivkohle betrug ca. 30 g/m2 (Muster 2).A reticulated polyurethane foam of 1.0 mm thickness and about 50 PPI was impregnated in accordance with US 3,091,550 and compressed to about 0.6 mm thickness after the binder had hardened. The amount of activated carbon was approx. 30 g / m 2 (sample 2).

Die Proben wurden in einen zylindrischen Probenhalter eingespannt und mit 98,3 ppm Xylol in N2 beaufschlagt. Geschwindigkeit des Gasstroms: 2,5 cm/s. Die Durchbruchskonzentration wurde mit einem FID gemessen. Die Tabelle gibt an, nach wieviel Sekunden ein bestimmter Durchbruch aufgetreten ist:The samples were clamped in a cylindrical sample holder and treated with 98.3 ppm xylene in N 2 . Gas flow speed: 2.5 cm / s. The breakthrough concentration was measured with an FID. The table shows the number of seconds after which a particular breakthrough occurred:

Aus der Tabelle geht hervor:The table shows:

1. daß Muster 1 zwar einen relativ hohen Anfangsdurchbruch (1% nach 4 s) hat, aber sich der Durchbruch während längerer Zeit anschließend in Grenzen hält (3% nach 380 s); 1. that pattern 1 has a relatively high initial breakthrough (1% after 4 s) has, but the breakthrough has continued for a long time Limits (3% after 380 s);  

2. daß Muster 2 einen geringeren Anfangsdurchbruch hat (1% nach 30 s), der Durchbruch aber schnell ansteigt (3% nach 120 s, 10% bereits nach 145 s);2. that pattern 2 has a lower initial breakthrough (1% after 30 s), the breakthrough increases quickly (3% after 120 s, 10% after 145 s);

3. daß Muster 2+1 am Anfang einen Durchbruch ähnlich Muster 2, später ähnlich Muster 1 aufweist;3. that pattern 2 + 1 at the beginning a breakthrough similar to pattern 2, later similar to pattern 1;

4. daß Muster 1+2 im Bereich bis 10% Durchbruch etwa 3% länger hält als Muster 2+1.4. that pattern 1 + 2 in the range up to 10% breakthrough lasts about 3% longer than Pattern 2 + 1.

Claims (10)

1. Filtersystem hoher Luftdurchlässigkeit, bestehend aus einem dreidimen­ sionalen porösen Träger, an dessen Wänden und Stegen Adsorberteil­ chen haften, dadurch gekennzeichnet, daß mindestens 2 Sektionen vor­ liegen, deren erste aus einem grobporigen Träger mit großen Adsorber­ teilchen, und deren zweite aus einem feinporigen Träger mit kleinen Ad­ sorberteilchen besteht.1. Filter system high air permeability, consisting of a three-dimensional porous support, on the walls and webs of which adsorber adheres, characterized in that there are at least 2 sections, the first of which consists of a large-pored support with large adsorber particles, and the second of which consists of a fine-pored support Carrier with small adsorber particles. 2. Filtersystem hoher Luftdurchlässigkeit, bestehend aus einem dreidimen­ sionalen porösen Träger, an dessen Wänden und Stegen Adsorberteil­ chen haften, dadurch gekennzeichnet, daß mehrere Sektionen vorliegen, deren Trägerstrukturen in Strömungsrichtung abnehmende Porendurch­ messer aufweisen und mit Adsorbern abnehmender Teilchengröße bela­ den sind.2. Filter system with high air permeability, consisting of a three-dimensional sional porous support, adsorber part on its walls and webs stick, characterized in that there are several sections, whose support structures have decreasing pores in the direction of flow have knives and load with adsorbers of decreasing particle size they are. 3. Filtersystem nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Trägerstruktur ein retikulierter PUR- Schaum ist.3. Filter system according to one or more of the preceding claims, characterized in that the support structure is a reticulated PUR Is foam. 4. Filtersystem nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß für die großporige Sektion Träger mit 10- 30, insbesondere 10-15 PPI, und für die feinporige Sektion Träger mit mindestens 30, insbesondere mit mindestens 40 PPI, verwendet wer­ den.4. Filter system according to one or more of the preceding claims, characterized in that for the large-pore section, carriers with 10- 30, in particular 10-15 PPI, and with carriers for the fine-pored section at least 30, in particular with at least 40 PPI, who used the. 5. Filtersystem nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Adsorbentien kugelförmig sind und aus Aktivkohle oder porösen Polymeren bestehen. 5. Filter system according to one or more of the preceding claims, characterized in that the adsorbents are spherical and consist of activated carbon or porous polymers.   6. Filtersystem nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Adsorberschicht aus vermahlenen, mit einem Binder vermischte Adsorbentien besteht.6. Filter system according to one or more of the preceding claims, characterized in that the adsorbent layer made of ground, with there are mixed adsorbents in a binder. 7. Filtersystem nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Teilchengröße der Adsorberkörner 0,1 bis 1 mm und der vermahlenen Adsorber 1-100, insbesondere 1-50 µm, beträgt.7. Filter system according to one or more of the preceding claims, characterized in that the particle size of the adsorber grains 0.1 up to 1 mm and the ground adsorber 1-100, in particular 1-50 µm, is. 8. Filtersystem nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Adsorber Zeolithe sind.8. Filter system according to one or more of the preceding claims, characterized in that the adsorbers are zeolites. 9. Filtersystem nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Adsorber chemisch wirksame Im­ prägnierungen tragen.9. Filter system according to one or more of the preceding claims, characterized in that the adsorber chemically active Im wear embossing. 10. Filtersystem nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Adsorber katalytisch wirksame Sub­ stanzen tragen10. Filter system according to one or more of the preceding claims, characterized in that the adsorber catalytically active sub punch wear
DE19924241605 1992-12-10 1992-12-10 High air permeability filter system - has coarsely porous absorption section followed by finely porous absorption section. Withdrawn DE4241605A1 (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5578114A (en) * 1994-03-04 1996-11-26 Grontmij Advies & Techniek Bv Biological filter provided with a pelletized biologically active compost carrier material and method for the production of a pelletized biologically active compost carrier material
US5616169A (en) * 1994-06-17 1997-04-01 Hasso von Blucher Seal-free and frame-free odor and/or pollutant filter
EP0803275A1 (en) * 1996-04-25 1997-10-29 Bridgestone Corporation Air filter
US6277179B1 (en) * 1998-06-23 2001-08-21 Ceca S.A. Agglomerates based on active charcoal, their process of preparation and their use as adsorption agents
EP1473070A1 (en) * 2002-02-07 2004-11-03 Bridgestone Corporation Fluid cleaning filter and filter device

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US5578114A (en) * 1994-03-04 1996-11-26 Grontmij Advies & Techniek Bv Biological filter provided with a pelletized biologically active compost carrier material and method for the production of a pelletized biologically active compost carrier material
US5616169A (en) * 1994-06-17 1997-04-01 Hasso von Blucher Seal-free and frame-free odor and/or pollutant filter
EP0803275A1 (en) * 1996-04-25 1997-10-29 Bridgestone Corporation Air filter
US6277179B1 (en) * 1998-06-23 2001-08-21 Ceca S.A. Agglomerates based on active charcoal, their process of preparation and their use as adsorption agents
EP1473070A1 (en) * 2002-02-07 2004-11-03 Bridgestone Corporation Fluid cleaning filter and filter device
EP1473070A4 (en) * 2002-02-07 2005-09-07 Bridgestone Corp Fluid cleaning filter and filter device
US7247237B2 (en) 2002-02-07 2007-07-24 Bridgestone Corporation Fluid cleaning filter and filter device

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