GB2248409A - Air filter - Google Patents

Air filter Download PDF

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Publication number
GB2248409A
GB2248409A GB9109265A GB9109265A GB2248409A GB 2248409 A GB2248409 A GB 2248409A GB 9109265 A GB9109265 A GB 9109265A GB 9109265 A GB9109265 A GB 9109265A GB 2248409 A GB2248409 A GB 2248409A
Authority
GB
United Kingdom
Prior art keywords
filter
air
housing
soda lime
colour
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
GB9109265A
Other versions
GB2248409B (en
GB9109265D0 (en
Inventor
John Christopher Thompson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB9109265D0 publication Critical patent/GB9109265D0/en
Publication of GB2248409A publication Critical patent/GB2248409A/en
Application granted granted Critical
Publication of GB2248409B publication Critical patent/GB2248409B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • 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
    • B01D53/0454—Controlling adsorption
    • 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
    • B01D2251/00—Reactants
    • B01D2251/40—Alkaline earth metal or magnesium compounds
    • B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/60—Inorganic bases or salts
    • B01D2251/604—Hydroxides
    • 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
    • B01D2253/25—Coated, impregnated or composite adsorbents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/50—Carbon oxides
    • B01D2257/504—Carbon dioxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
    • B01D2257/702—Hydrocarbons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/06—Polluted air
    • 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
    • B01D2259/40083—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption
    • B01D2259/40084—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by exchanging used adsorbents with fresh adsorbents
    • 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
    • B01D2259/4148—Multiple layers positioned apart from each other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/45—Gas separation or purification devices adapted for specific applications
    • B01D2259/4566—Gas separation or purification devices adapted for specific applications for use in transportation means
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00—Capture or disposal of greenhouse gases
    • Y02C20/40—Capture or disposal of greenhouse gases of CO2

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Treating Waste Gases (AREA)
  • Gas Separation By Absorption (AREA)

Abstract

An air filter (10) comprises a transparent housing (12) within which granules of soda lime (11) incorporating a colour indicator are contained. The filter (10) further comprises an activated carbon filter (15) in two parts (16, 17). In use, fumes of hydrocarbon are removed from the air by activated carbon filter (15) and carbon dioxide is removed from the air by the soda lime granules (11). When the soda lime granules (11) have been exhausted, they change colour, and this colour change is readily seen through the transparent housing (12). <IMAGE>

Description

AIR FILTER This invention relates to an air filter for removing pollutants such as carbon dioxide and hydrocarbons from air, and particularly, but not exclusively, to an air filter for use in a car. It is desirable to use an air filter with a car, to ensure a supply of clean air to the interior of the car, despite pollution which may exist in the immediate surrounding atmosphere.
A known air filter relies upon the use of a liquid filter, to remove some of the pollutants found in the air. An air filter of this known type may be expensive to make, as well as fragile, and not easily adapted to be used in different makes of car.
It is an object of the present invention to provide an air filter which is inexpensive and robust.
According to the invention there is provided an air filter for filtering air which passes through it, comprising a first solid filter means for absorbing carbon dioxide contained in air passing through the filter, a housing enclosing the first filter means, and a second solid filter means for removing hydrocarbons from the air.
By using solid filter means, a robust- and relatively inexpensive air filter may be produced, which may be adapted for use in different cars.
The second filter means may be contained within the housing, or alternatively, it may be positioned outside of the housing.
Conveniently, the air filter further comprises air inlet means and air outlet means, the first and second filter means and the housing being positioned between the inlet means and the outlet means. Air may pass through the filter via the inlet means, and during the passage through the filter, pollutants are removed. The air then exits via the outlet means.
The inlet means and outlet means may each comprise a single duct, but preferably they each comprise a mesh comprising a matrix of holes, or a single row of holes.
Advantageously, the first filter means comprises granules of soda lime incorporating a colour indicator and at least a portion of the housing is transparent. Once the soda lime is exhausted, it changes colour and therefore, by enclosing the soda lime granules in a housing which is either partially or completely transparent, it is possible to easily ascertain when the filter requires changing.
Preferably, the second filter means comprises an active carbon filter.
Conveniently, the second solid filter means comprises a first filter part positioned between the inlet means and the housing, and a second filter part positioned between the housing and the outlet means. Thus, air entering the filter via the inlet means, first passes through the first filter means where carbon dioxide is removed from it, before passing through the second filter part of the second filter means where further hydrocarbons are removed from the air. Alternatively the filter means may be positioned such that air passes through the second filter means before passing through the first filter means.
Alternatively, the first and second filter parts may be contained within the housing.
The housing may be in the form of a hollow cuboid or a hollow cylinder, or any other convenient shape.
An embodiment of the invention will now be described by way of example only with reference to the accompanying drawing in which: Figure 1 is a schematic representation of an air filter according to the invention.
Referring to figure 1, an air filter suitable for use in a car is indicated generally by the reference (10). The filter (10) comprises a first filter means (11) comprising granules of soda lime incorporating a colour indicator.
Soda lime is a mixture of sodium hydroxide, and a calcium hydroxide. The soda lime granules (11) are enclosed in a transparent housing (12). The transparent housing is in the form of a hollow cuboid.
The filter further comprises second filter means (15) comprising activated carbon. In this embodiment of the invention, the second filter means is positioned outside of the housing (12), although it could also be positioned within the housing (12). The second filter means (15) is formed into two parts (16,17). An air inlet means (18) is positioned adjacent to the filter part (16) and an air outlet means (19) is positioned adjacent to the filter part (17). The inlet means (18) and outlet means (19) each comprises a mesh comprising a matrix of small holes. This allows air to flow evenly through the filter (10). In use, air from the outside of the car and for use in ventilating the interior of the car enters the filter (10) via inlet means (18) as shown by arrows (20). The air first passes through activated carbon filter (16) where hydrocarbon fumes contained in the air are removed. The air next passes through the housing (12) and into the soda lime granules (11) where carbon dioxide is removed from the air.
The air then passes through the housing (12), and into activated carbon filter (17) where further hydrocarbon fumes are removed from the air. The air then passes out of the filter (10) via outlet (19), and into the interior of the car. When the soda lime granules have been exhausted, they change colour due to the presence of the colour indicator. The colour change may be for example, from white to pink, or from green to brown, depending on the type of colour indicator used. This change of colour may be easily seen through the transparent housing (12). When this change of colour occurs, it is necessary to replace the filter with a new one.

Claims (6)

1. An air filter (10) for filtering air which passes through it, comprising a first solid filter means (11) for absorbing carbon dioxide contained in air passing through the filter a housing (12) enclosing the first filter means, and a second solid filter means (15) for removing hydrocarbons from the air.
2. A filter as claimed in claim 1 further comprising air inlet means (18) and an air outlet means (19) the first and second filter means and the housing being positioned between the inlet means and the outlet means.
3. A filter as claimed in claim 2 wherein the second solid filter means comprises a first filter part (16) positioned between the inlet means and the housing, and a second filter part (17) positioned between the housing and the outlet means.
4. A filter as claimed in any of the proceeding claims wherein the first filter means comprises granules of soda lime incorporating a colour indicator, and at least a portion of the housing is transparent.
5. A filter as claimed in any one of the preceding claims wherein the second filter means comprises an active carbon filter.
6. A filter substantially as hereinbefore described with reference to the accompanying drawing.
GB9109265A 1990-05-03 1991-04-30 Air filter Expired - Fee Related GB2248409B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB909010008A GB9010008D0 (en) 1990-05-03 1990-05-03 Air filter

Publications (3)

Publication Number Publication Date
GB9109265D0 GB9109265D0 (en) 1991-06-19
GB2248409A true GB2248409A (en) 1992-04-08
GB2248409B GB2248409B (en) 1994-04-13

Family

ID=10675441

Family Applications (2)

Application Number Title Priority Date Filing Date
GB909010008A Pending GB9010008D0 (en) 1990-05-03 1990-05-03 Air filter
GB9109265A Expired - Fee Related GB2248409B (en) 1990-05-03 1991-04-30 Air filter

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB909010008A Pending GB9010008D0 (en) 1990-05-03 1990-05-03 Air filter

Country Status (1)

Country Link
GB (2) GB9010008D0 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2186516A1 (en) * 2001-01-08 2003-05-01 Univ Vigo System for reduction of concentration of carbon dioxide in closed locations and uses crystal cylinder filled with substance which adsorbs carbon dioxide
WO2005094969A1 (en) * 2004-03-30 2005-10-13 Mario Arborio Air cleaning device for vehicles and buildings
US8865073B2 (en) * 2012-06-14 2014-10-21 Shimadzu Corporation Air purifier and total organic carbon measuring device using the air purifier

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD236679A1 (en) * 1985-04-29 1986-06-18 Leuna Werke Veb PROCESS FOR CLEANING AIR
US4698072A (en) * 1985-05-22 1987-10-06 Linde Aktiengesellschaft Adsorber bed apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD236679A1 (en) * 1985-04-29 1986-06-18 Leuna Werke Veb PROCESS FOR CLEANING AIR
US4698072A (en) * 1985-05-22 1987-10-06 Linde Aktiengesellschaft Adsorber bed apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2186516A1 (en) * 2001-01-08 2003-05-01 Univ Vigo System for reduction of concentration of carbon dioxide in closed locations and uses crystal cylinder filled with substance which adsorbs carbon dioxide
WO2005094969A1 (en) * 2004-03-30 2005-10-13 Mario Arborio Air cleaning device for vehicles and buildings
US8865073B2 (en) * 2012-06-14 2014-10-21 Shimadzu Corporation Air purifier and total organic carbon measuring device using the air purifier

Also Published As

Publication number Publication date
GB2248409B (en) 1994-04-13
GB9010008D0 (en) 1990-06-27
GB9109265D0 (en) 1991-06-19

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20000430