WO2016190787A1 - Filter sequence comprising an odour suppressing filter - Google Patents

Filter sequence comprising an odour suppressing filter Download PDF

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Publication number
WO2016190787A1
WO2016190787A1 PCT/SE2015/000032 SE2015000032W WO2016190787A1 WO 2016190787 A1 WO2016190787 A1 WO 2016190787A1 SE 2015000032 W SE2015000032 W SE 2015000032W WO 2016190787 A1 WO2016190787 A1 WO 2016190787A1
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WO
WIPO (PCT)
Prior art keywords
filter
sequence
active carbon
odour
filters
Prior art date
Application number
PCT/SE2015/000032
Other languages
French (fr)
Inventor
Dolk-Petersson Bo
Original Assignee
Qlean Air Scandinavia Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Qlean Air Scandinavia Ab filed Critical Qlean Air Scandinavia Ab
Priority to PCT/SE2015/000032 priority Critical patent/WO2016190787A1/en
Publication of WO2016190787A1 publication Critical patent/WO2016190787A1/en

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L9/00—Disinfection, sterilisation or deodorisation of air
    • A61L9/01—Deodorant compositions
    • A61L9/014—Deodorant compositions containing sorbent material, e.g. activated carbon
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
    • F24F8/10—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering
    • F24F8/108—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering using dry filter elements
    • 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
    • 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
    • B01D53/26—Drying gases or vapours
    • B01D53/28—Selection of materials for use as drying agents
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
    • F24F8/10—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
    • F24F8/10—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering
    • F24F8/15—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering by chemical means
    • F24F8/158—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering by chemical means using active carbon
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L2209/00—Aspects relating to disinfection, sterilisation or deodorisation of air
    • A61L2209/10—Apparatus features
    • A61L2209/14—Filtering means
    • 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
    • B01D2257/00—Components to be removed
    • B01D2257/80—Water
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/90—Odorous compounds not provided for in groups B01D2257/00 - B01D2257/708
    • 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

Definitions

  • FILTER SEQUENCE COMPRISING AN ODOUR SUPPRESSING FILTER
  • the present invention relates to a filter sequence according to the introductory portion of the independent claim.
  • An object of the invention is therefore to provide a filter sequence which decreases the amount of undesirable odours that is emitted bt the a filter sequence.
  • the invention relates to a filter sequence constituting part of an air filtration system, where the filter sequence comprises at least one active carbon filter AC, AC 1-2, and at least one odour suppressing filter S. Odours that arise from the active carbon filter are efficiently suppressed by the odour suppressing filter.
  • the filter sequence further comprises at least a Zeolite filter Z, where the Zeolite filter Z is arranged after all the active carbon filters AC, AC 1-2 in the filter sequence.
  • the Zeolite filter Z is arranged after the odour suppressing filter S.
  • the invention further relates to such a filter sequence where the odour suppressing filter S is arranged after all the active carbon filters AC, AC 1-2 in the filter sequence, such a filter sequence where the odour suppressing filter S is arranged before all the active carbon filters AC, AC 1-2 in the filter sequence or such a filter sequence that comprises at least two active carbon filters AC, AC 1-2, where the odour suppressing filter S is arranged between two active carbon filters AC, AC 1-2 in the filter sequence.
  • the odour suppressing filter S has as its main active substance a hygroscopic substance, and this hygroscopic substance may be a hygroscopic salt. In one embodiment the odour suppressing filter S has as its main active substance sodium chloride.
  • Fig. 1 shows a first embodiment of a filter sequence according to the invention.
  • Fig. 2 shows a second embodiment of the filter sequence.
  • Fig. 3 shows a third embodiment of the filter sequence.
  • Fig. 4 shows a fourth embodiment of the filter sequence.
  • Fig. 5 shows a fifth embodiment of the filter sequence.
  • Fig. 6 shows a sixth embodiment of the filter sequence.
  • Fig. 7 shows a seventh embodiment of the filter sequence.
  • the invention relates to a filter sequence that is used to clean contaminated air.
  • the filter sequence if arranged in an air tight fashion in containment with an inlet and an outlet.
  • the filter sequence is normally used in conjunction with a fan or a pump that makes air enter the inlet to the filter sequence, pass through the filters, and exit the filters through the outlet, as the arrows in the figures indicate.
  • the containment, the fan or any other necessary components are not depicted, and the figures just illustrate several general embodiments of the sequence of filter units that is denoted filter sequence.
  • Fig. 1 shows a first embodiment of a filter sequence according to the invention, which comprises a sequence of three consecutive filters.
  • the first filter S is constituted by an odour suppressing filter and its influence makes air passing through the filter sequence getting a significantly reduced undesirable odour.
  • the odour suppressing filter S is generally constituted by a hygroscopic substance, and normally this hygroscopic substance is water soluble. More specifically, it comprises a hygroscopic salt, and a good example is filters based on table salt, NaCl.
  • Actual table salt filter typically contains about 95% table salt, but in addition to this other substances are also added, such as ferrocyanide, anticaking agents and other.
  • the first filter is followed by a second filter constituted by an active carbon filter AC.
  • the active carbon filter is primarily intended to adsorb gaseous substances that constitute contaminations in the air that passes through the filter, but may also to some extent act as a mechanical filter that blocks particles in the air.
  • active carbon filters When active carbon filters are used to clean air, in particular when they are used for cleaning cigarette smoke in air, the filter itself tends to generate gaseous substances that are not adsorbed by the filter, but passes through the filter and generates what to humans is experienced as undesirable odour.
  • the purpose of the odour suppressing filter S is to prevent such odours.
  • the active carbon filter AC follows a third filter M that is constituted by an ordinary mechanical filter, which is a filter that filters particles in the air that are too large to pass through the mechanical filter.
  • the mechanical filter is constituted by a filter of HEP A class HI 4, which for example is suitable for removing particles in air laden with particles from cigarette smoke.
  • Fig. 2 shows a second embodiment of the filter sequence, which comprises four consecutive filter elements.
  • the filter sequence starts in the same way as in the first embodiment, with an odour suppressing filter S, having the same function as in the first embodiment.
  • the odour suppressing filter S is followed by a mechanical filter M which in turn is followed by an active carbon filter AC.
  • the order of the second and third filters is reversed with respect to the first embodiment, where the active carbon filter AC is followed by a mechanical filter M.
  • the active carbon filter follows after the odour suppressing filter S, but as shown by the fourth embodiment, this is not necessary.
  • the fourth and last filter is constituted by a Zeolite filter Z.
  • the Zeolite filter absorbs undesirable remaining substances in the air, in a way that is similar to the function of the active carbon filter, but the Zeolite filter tends to absorb other substances than the active carbon filter, or absorbs substances to an extent different from that of the active carbon filter.
  • the absorption of the carbon filter and the Zeolite filter complements each other, such that the total absorption of the two filters is greater than what could be achieved with only carbon filters or only Zeolite filters.
  • the Zeolite filter follows the active carbon filter, that is the Zeolite filter is arranged further downstream from the active carbon filter. They don't have to be consecutive, that is an active carbon filter immediately followed by a Zeolite filter, the the order is of importance.
  • Fig. 3 shows a third embodiment of the filter sequence, which comprises five consecutive filter elements.
  • the filter sequence starts in the same way as in the first embodiment, with an odour suppressing filter S, having the same function as in the first embodiment.
  • the third embodiment of the filter sequence comprises two different active carbon filters AC1, AC2.
  • the odour suppressing filter S is followed by a second filter AC1 that is constituted by a first CS active carbon filter, which is an active carbon filter produced from coconut shells.
  • a third filter M constituted by a mechanical HEPA filter class HI 4.
  • a fourth filter AC2 constituted by a second active carbon filter type GA.
  • the two active carbon filters are intentionally selected to be of different kinds, as they preferentially adsorb different substances in such a way that the two filters complement each other.
  • the effect of the odour suppressing filter S is sufficient to suppress undesirable odours from both the active carbon filters.
  • the second active carbon filter AC2 is followed by a fifth and last filter constituted by a Zeolite filter Z.
  • the Zeolite filter complements the adsorption in both the active carbon filters in a way corresponding to that in the second embodiment.
  • Fig. 4 shows a fourth embodiment of the filter sequence, which in the same way as the third embodiment comprises five consecutive filter elements.
  • the third and fourth embodiment differ from each other only in the order of the first two filter, that is the odour suppressing filter S and the first active carbon filter ACl.
  • Both filters are of the same types as in the third embodiment, but here the first active carbon filter ACl is the first element in the whole sequence of filters, while the odour suppressing filter S sits as the second element in the whole sequence of filters. Tests have shown that the order between the odour suppressing filter S and the active carbon filter or the active carbon filters is of little importance for the efficiency of the odour suppressing filter S.
  • Fig. 5 shows a fifth embodiment of the filter sequence, which in the same way as the third and fourth embodiments comprises five consecutive filter elements.
  • the filter elements in the fifth embodiment is the same as in the third and fourth embodiments, but the order is different.
  • the first and second filter elements are here a first ACl and a second active carbon filter AC2.
  • the first active carbon filter ACl is of the CS type and the second active carbon filter AC2 is of the GA type. Their respective adsorbtion complement each other in a way corresponding to that of the third and fourth embodiments.
  • AC2 follows a third filter in the form of an odour suppressing filter S.
  • the odour suppressing filter S here follows after the active carbon filters, while it sits between the active carbon filters in the third embodiment and before the active carbon filters in the fourth embodiment. All these three versions have in practical tests been shown to be near functionally equivalent, that is the suppression of the undesirable öns leaving the active carbon filters is high in all three cases.
  • the odour suppressing filter S here follows a mechanical filter M of the same HEPA class as before.
  • a Zeolite filter Z is arranged last in the sequence, that eliminates the last remnants of undesirable substances. It should be noted that the Zeolite filter as in the previous embodiments sits after both the active carbon filters.
  • Fig. 6 shows a sixth embodiment of the filter sequence comprising six consecutive filter elements. The sixth embodiment is identical to the third embodiment, except that the sequence of filters in the third embodiment here is preceded by a first filter Ml .
  • the first filter element Ml is constituted by a mechanical filter Ml of HEP A type, which is also the case for the fourth filter M2 in the filter sequence.
  • the two mechanical filters, that is first the filter and the fourth filter, are preferably of different classes.
  • the first filter acts as a prefilter that prevents paryicles from the air to accumulate in either the odour suppressing filter S or the first active carbon filter AC1.
  • Fig. 7 shows a seventh embodiment of the filter sequence, which in the same way as in the sixth embodiment comprises six consecutive filter elements. The order of the filter elements is different from previous embodiment.
  • the first filter element in the seventh embodiment is constituted by a first mechanical filter Ml, and does just as in the sixth embodiment act as a prefilter.
  • the second filter is a first active carbon filter AC1 followed by a third filter in the form of an odour suppressing filter S.
  • the fourth filter is constituted by a second active carbon filter AC2 and the fifth filter is a Zeolite filter Z.
  • the last and sixth filter is constituted by a second mechanical filter M2.
  • the odour suppressing filter, the active carbon filters AC1, AC2 and the Zeolite filter Z may emit small amounts of particles that come from the active filtering substance, so the second mechanical filter M2 acts as an end filter that removes any such particles.
  • the two mechanical filters Ml, M2 are preferably different, such that their actions complement each other.
  • the two active carbon filters are preferably of different kinds, such that their joint effect is better than if two identical filters had been used.
  • each filter element is denoted filter, but by this is not necessarily meant a unit that removes a contamination, and instead elements are conceivable that adds a substance to the air flowing through the filter element.
  • An example is constituted by a hygroscopic salt filter. That absorbs moisture from the air passing through it until it has been saturated by water. If the humidity of the air passing through the salt filter falls, the salt will instead emit water vapour to the dry air passing through the salt filter.
  • the concept denoted filter here generally refers to an element through which a fluid passes, where the filter acts on the fluid.
  • the odour suppressing filter is constituted by a hygroscopic substance, and Zeolite too is hygroscopic, but Zeolite is here excluded from the concept of a hygroscopic substance.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Life Sciences & Earth Sciences (AREA)
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  • Veterinary Medicine (AREA)
  • General Health & Medical Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
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  • Materials Engineering (AREA)
  • Separation Of Gases By Adsorption (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)

Abstract

The invention relates to a filter sequence constituting part of an air filtration system, where the filter sequence comprises an active carbon filter (AC, AC 1-2), and further an odour suppressing filter (S). Odours that arise from the active carbon filter are suppressed by the odour suppressing filter. In one embodiment, the filter sequence further comprises at least a Zeolite filter Z, where the Zeolite filter Z is arranged after all the active carbon filters AC, AC 1-2 in the filter sequence. With the Zeolite filter arranged in thios way, it efficiently eliminates remaining substances in the purified air The odour suppressing filter (S) has as its main active substance a hygroscopic substance, and this hygroscopic substance may be a hygroscopic salt. In one embodiment the odour suppressing filter (S) has as its main active substance sodium chloride.

Description

FILTER SEQUENCE COMPRISING AN ODOUR SUPPRESSING FILTER
The present invention relates to a filter sequence according to the introductory portion of the independent claim.
In particular, it relates to such a filter sequence intended to reduce undesirable odeurs. Background of the invention
In air filtration, a consecutive sequence of different types of filters is used, of which often at least one is an active carbon filter. Active carbon filters efficiently eliminates many undesired substances in the air that is to be purified but, in particular in cleaning of air laden with cigarette smoke, the active carbon filters themselves generate substances that are perceived as disturbing. It is not clear where the substances that are emitted by the filter come from, but they are indeed generated and this constitutes a problem that so far has not been solved.
An object of the invention is therefore to provide a filter sequence which decreases the amount of undesirable odours that is emitted bt the a filter sequence.
These and other objects are attained by a filter sequence according to the characterising portion of the independent claim.
Summary of the invention
The invention relates to a filter sequence constituting part of an air filtration system, where the filter sequence comprises at least one active carbon filter AC, AC 1-2, and at least one odour suppressing filter S. Odours that arise from the active carbon filter are efficiently suppressed by the odour suppressing filter.
In one advantageous embodiment, the filter sequence further comprises at least a Zeolite filter Z, where the Zeolite filter Z is arranged after all the active carbon filters AC, AC 1-2 in the filter sequence.
In yet another advantageous embodiment the Zeolite filter Z is arranged after the odour suppressing filter S.
The invention further relates to such a filter sequence where the odour suppressing filter S is arranged after all the active carbon filters AC, AC 1-2 in the filter sequence, such a filter sequence where the odour suppressing filter S is arranged before all the active carbon filters AC, AC 1-2 in the filter sequence or such a filter sequence that comprises at least two active carbon filters AC, AC 1-2, where the odour suppressing filter S is arranged between two active carbon filters AC, AC 1-2 in the filter sequence.
The odour suppressing filter S has as its main active substance a hygroscopic substance, and this hygroscopic substance may be a hygroscopic salt. In one embodiment the odour suppressing filter S has as its main active substance sodium chloride.
Brief description of the drawings
Fig. 1 shows a first embodiment of a filter sequence according to the invention.
Fig. 2 shows a second embodiment of the filter sequence.
Fig. 3 shows a third embodiment of the filter sequence.
Fig. 4 shows a fourth embodiment of the filter sequence.
Fig. 5 shows a fifth embodiment of the filter sequence.
Fig. 6 shows a sixth embodiment of the filter sequence.
Fig. 7 shows a seventh embodiment of the filter sequence.
Description of preferred embodiments
The invention relates to a filter sequence that is used to clean contaminated air. The filter sequence if arranged in an air tight fashion in containment with an inlet and an outlet. The filter sequence is normally used in conjunction with a fan or a pump that makes air enter the inlet to the filter sequence, pass through the filters, and exit the filters through the outlet, as the arrows in the figures indicate. As the invention is directed towards the combination of filters as such, the containment, the fan or any other necessary components are not depicted, and the figures just illustrate several general embodiments of the sequence of filter units that is denoted filter sequence.
Fig. 1 shows a first embodiment of a filter sequence according to the invention, which comprises a sequence of three consecutive filters. The first filter S is constituted by an odour suppressing filter and its influence makes air passing through the filter sequence getting a significantly reduced undesirable odour. The odour suppressing filter S is generally constituted by a hygroscopic substance, and normally this hygroscopic substance is water soluble. More specifically, it comprises a hygroscopic salt, and a good example is filters based on table salt, NaCl. Actual table salt filter typically contains about 95% table salt, but in addition to this other substances are also added, such as ferrocyanide, anticaking agents and other.
The first filter is followed by a second filter constituted by an active carbon filter AC. The active carbon filter is primarily intended to adsorb gaseous substances that constitute contaminations in the air that passes through the filter, but may also to some extent act as a mechanical filter that blocks particles in the air. When active carbon filters are used to clean air, in particular when they are used for cleaning cigarette smoke in air, the filter itself tends to generate gaseous substances that are not adsorbed by the filter, but passes through the filter and generates what to humans is experienced as undesirable odour. The purpose of the odour suppressing filter S is to prevent such odours.
After the active carbon filter AC follows a third filter M that is constituted by an ordinary mechanical filter, which is a filter that filters particles in the air that are too large to pass through the mechanical filter. In the selected embodiment, the mechanical filter is constituted by a filter of HEP A class HI 4, which for example is suitable for removing particles in air laden with particles from cigarette smoke.
Fig. 2 shows a second embodiment of the filter sequence, which comprises four consecutive filter elements. The filter sequence starts in the same way as in the first embodiment, with an odour suppressing filter S, having the same function as in the first embodiment.
The odour suppressing filter S is followed by a mechanical filter M which in turn is followed by an active carbon filter AC. The order of the second and third filters is reversed with respect to the first embodiment, where the active carbon filter AC is followed by a mechanical filter M. In the second embodiment too, the active carbon filter follows after the odour suppressing filter S, but as shown by the fourth embodiment, this is not necessary.
The fourth and last filter is constituted by a Zeolite filter Z. The Zeolite filter absorbs undesirable remaining substances in the air, in a way that is similar to the function of the active carbon filter, but the Zeolite filter tends to absorb other substances than the active carbon filter, or absorbs substances to an extent different from that of the active carbon filter. The absorption of the carbon filter and the Zeolite filter complements each other, such that the total absorption of the two filters is greater than what could be achieved with only carbon filters or only Zeolite filters.
For optimal effect, the Zeolite filter follows the active carbon filter, that is the Zeolite filter is arranged further downstream from the active carbon filter. They don't have to be consecutive, that is an active carbon filter immediately followed by a Zeolite filter, the the order is of importance.
Fig. 3 shows a third embodiment of the filter sequence, which comprises five consecutive filter elements. The filter sequence starts in the same way as in the first embodiment, with an odour suppressing filter S, having the same function as in the first embodiment.
The third embodiment of the filter sequence comprises two different active carbon filters AC1, AC2. The odour suppressing filter S is followed by a second filter AC1 that is constituted by a first CS active carbon filter, which is an active carbon filter produced from coconut shells. After that follows a third filter M constituted by a mechanical HEPA filter class HI 4. Then follows a fourth filter AC2 constituted by a second active carbon filter type GA. The two active carbon filters are intentionally selected to be of different kinds, as they preferentially adsorb different substances in such a way that the two filters complement each other.
The effect of the odour suppressing filter S is sufficient to suppress undesirable odours from both the active carbon filters.
The second active carbon filter AC2 is followed by a fifth and last filter constituted by a Zeolite filter Z. The Zeolite filter complements the adsorption in both the active carbon filters in a way corresponding to that in the second embodiment.
Fig. 4 shows a fourth embodiment of the filter sequence, which in the same way as the third embodiment comprises five consecutive filter elements. The third and fourth embodiment differ from each other only in the order of the first two filter, that is the odour suppressing filter S and the first active carbon filter ACl. Both filters are of the same types as in the third embodiment, but here the first active carbon filter ACl is the first element in the whole sequence of filters, while the odour suppressing filter S sits as the second element in the whole sequence of filters. Tests have shown that the order between the odour suppressing filter S and the active carbon filter or the active carbon filters is of little importance for the efficiency of the odour suppressing filter S.
Fig. 5 shows a fifth embodiment of the filter sequence, which in the same way as the third and fourth embodiments comprises five consecutive filter elements. The filter elements in the fifth embodiment is the same as in the third and fourth embodiments, but the order is different.
The first and second filter elements are here a first ACl and a second active carbon filter AC2. The first active carbon filter ACl is of the CS type and the second active carbon filter AC2 is of the GA type. Their respective adsorbtion complement each other in a way corresponding to that of the third and fourth embodiments.
After the two active carbon filters ACl, AC2 follows a third filter in the form of an odour suppressing filter S. the odour suppressing filter S here follows after the active carbon filters, while it sits between the active carbon filters in the third embodiment and before the active carbon filters in the fourth embodiment. All these three versions have in practical tests been shown to be near functionally equivalent, that is the suppression of the undesirable odeurs leaving the active carbon filters is high in all three cases.
After the third filter, the odour suppressing filter S, here follows a mechanical filter M of the same HEPA class as before.
A Zeolite filter Z is arranged last in the sequence, that eliminates the last remnants of undesirable substances. It should be noted that the Zeolite filter as in the previous embodiments sits after both the active carbon filters. Fig. 6 shows a sixth embodiment of the filter sequence comprising six consecutive filter elements. The sixth embodiment is identical to the third embodiment, except that the sequence of filters in the third embodiment here is preceded by a first filter Ml . The first filter element Ml is constituted by a mechanical filter Ml of HEP A type, which is also the case for the fourth filter M2 in the filter sequence. The two mechanical filters, that is first the filter and the fourth filter, are preferably of different classes. The first filter acts as a prefilter that prevents paryicles from the air to accumulate in either the odour suppressing filter S or the first active carbon filter AC1.
Fig. 7 shows a seventh embodiment of the filter sequence, which in the same way as in the sixth embodiment comprises six consecutive filter elements. The order of the filter elements is different from previous embodiment.
The first filter element in the seventh embodiment is constituted by a first mechanical filter Ml, and does just as in the sixth embodiment act as a prefilter. The second filter is a first active carbon filter AC1 followed by a third filter in the form of an odour suppressing filter S. The fourth filter is constituted by a second active carbon filter AC2 and the fifth filter is a Zeolite filter Z. The last and sixth filter is constituted by a second mechanical filter M2. The odour suppressing filter, the active carbon filters AC1, AC2 and the Zeolite filter Z may emit small amounts of particles that come from the active filtering substance, so the second mechanical filter M2 acts as an end filter that removes any such particles.
The two mechanical filters Ml, M2 are preferably different, such that their actions complement each other. In the same fashion, the two active carbon filters are preferably of different kinds, such that their joint effect is better than if two identical filters had been used.
In the description, each filter element is denoted filter, but by this is not necessarily meant a unit that removes a contamination, and instead elements are conceivable that adds a substance to the air flowing through the filter element. An example is constituted by a hygroscopic salt filter. That absorbs moisture from the air passing through it until it has been saturated by water. If the humidity of the air passing through the salt filter falls, the salt will instead emit water vapour to the dry air passing through the salt filter. The concept denoted filter here generally refers to an element through which a fluid passes, where the filter acts on the fluid.
The odour suppressing filter is constituted by a hygroscopic substance, and Zeolite too is hygroscopic, but Zeolite is here excluded from the concept of a hygroscopic substance.

Claims

Claims
1 A filter sequence constituting part of an air filtration system, where the filter sequence comprises at least one active carbon filter (AC, AC 1-2), and at least one odour suppressing filter (S), characterised in that the odour suppressing filter (S) has as its main active substance a hygroscopic salt.
2 A filter sequence according to claim 1, characterised in that the Zeolite filter (Z) s arranged after all the active carbon filters (AC, AC 1-2) in the filter sequence.
3 A filter sequence according to claim 1 or 2, characterised in that the Zeolite filter (Z) is arranged after the odour suppressing filter (S).
4 A filter sequence according to one of the preceding claims, characterised in that the odour suppressing filter (S) is arranged after all the active carbon filters (AC, AC 1-2) in the filter sequence.
5 A filter sequence according to one of claims 1-3, characterised in that the odour suppressing filter (S) is arranged before all the active carbon filters (AC, AC 1-2) in the filter sequence.
6 A filter sequence according to one of claims 1-3, characterised in that the filter sequence comprises at least two active carbon filters (AC, AC 1-2), where the odour suppressing filter (S) is arranged between two active carbon filters (AC, AC 1-2) in the filter sequence.
7 A filter sequence according to one of the preceding claims, characterised in that the filter sequence, further comprises at least one mechanical filter (M, Ml -2). A filter sequence according to one of the preceding claims, characterised in that the odour suppressing filter (S) has as its main active substance sodium chloride.
PCT/SE2015/000032 2015-05-27 2015-05-27 Filter sequence comprising an odour suppressing filter WO2016190787A1 (en)

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PCT/SE2015/000032 WO2016190787A1 (en) 2015-05-27 2015-05-27 Filter sequence comprising an odour suppressing filter

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Cited By (1)

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US10222113B1 (en) * 2016-09-01 2019-03-05 Florida A&M University Solar adiabatic cooling apparatus

Citations (6)

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WO1994014013A1 (en) * 1992-12-11 1994-06-23 Jaakko Raippalinna Filter system to purify air of smoking rooms
US20070083998A1 (en) * 2005-10-13 2007-04-19 Leskowicz James J Deodorizing compositions
WO2014114345A1 (en) * 2013-01-25 2014-07-31 Hauser Umwelt-Service Gmbh & Co. Kg Room air filter system
US20140260989A1 (en) * 2013-03-14 2014-09-18 Universal Laser Systems, Inc. Multi-stage air filtration systems and associated apparatuses and methods
SE1400258A1 (en) * 2014-05-21 2015-11-22 Qleanair Scandinavia Ab filter Series
SE1400257A1 (en) * 2014-05-21 2015-11-22 Qleanair Scandinavia Ab Fragrance suppressing air filter

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Publication number Priority date Publication date Assignee Title
WO1994014013A1 (en) * 1992-12-11 1994-06-23 Jaakko Raippalinna Filter system to purify air of smoking rooms
US20070083998A1 (en) * 2005-10-13 2007-04-19 Leskowicz James J Deodorizing compositions
WO2014114345A1 (en) * 2013-01-25 2014-07-31 Hauser Umwelt-Service Gmbh & Co. Kg Room air filter system
US20140260989A1 (en) * 2013-03-14 2014-09-18 Universal Laser Systems, Inc. Multi-stage air filtration systems and associated apparatuses and methods
SE1400258A1 (en) * 2014-05-21 2015-11-22 Qleanair Scandinavia Ab filter Series
SE1400257A1 (en) * 2014-05-21 2015-11-22 Qleanair Scandinavia Ab Fragrance suppressing air filter

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Publication number Priority date Publication date Assignee Title
US10222113B1 (en) * 2016-09-01 2019-03-05 Florida A&M University Solar adiabatic cooling apparatus

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