WO2000015324A1 - Dispositif contenant une composition supprimant l'ozone, destine a etre fixe a des systemes echangeurs de chaleur - Google Patents

Dispositif contenant une composition supprimant l'ozone, destine a etre fixe a des systemes echangeurs de chaleur Download PDF

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Publication number
WO2000015324A1
WO2000015324A1 PCT/US1999/017637 US9917637W WO0015324A1 WO 2000015324 A1 WO2000015324 A1 WO 2000015324A1 US 9917637 W US9917637 W US 9917637W WO 0015324 A1 WO0015324 A1 WO 0015324A1
Authority
WO
WIPO (PCT)
Prior art keywords
ozone
housing
removing composition
gas
heat exchange
Prior art date
Application number
PCT/US1999/017637
Other languages
English (en)
Inventor
Jeffrey B. Hoke
Ronald M. Heck
Ernest Behm
David H. Eckstein
Original Assignee
Engelhard Corporation
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 Engelhard Corporation filed Critical Engelhard Corporation
Priority to AU53925/99A priority Critical patent/AU5392599A/en
Publication of WO2000015324A1 publication Critical patent/WO2000015324A1/fr

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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/66—Ozone
    • 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8671—Removing components of defined structure not provided for in B01D53/8603 - B01D53/8668
    • B01D53/8675—Ozone
    • 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
    • F24F8/95—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying specially adapted for specific purposes
    • F24F8/98—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying specially adapted for specific purposes for removing ozone
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Definitions

  • the present invention is generally directed to a device for treating a gas
  • the present invention enables existing heat exchange systems to be retrofitted
  • a device for removing ozone from a gas containing the same such as the
  • Such materials can include, for example,
  • ozone catalyzing compositions for example, ozone catalyzing compositions, ozone adsorbing or absorbing materials
  • Such systems is an inlet for receiving a stream of gas (e.g. air) often generated by
  • an ozone removing composition includes coating with an ozone
  • ozone levels in the atmosphere The reduction of ozone is accomplished by passing
  • composition formulated at least in part for removing ozone from the stream of gas.
  • compositions which effectively remove ozone at low temperatures in which the device can be operatively attached to the external housing of an existing heat exchange system.
  • This provides an improvement to heat exchange systems so that they can remove ozone from a gas containing the same and do so through the use of an add on or retrofitted device. It would also be beneficial to retrofit heat exchange systems which already contain an ozone removing composition to provide additional ozone removing capacity.
  • the present invention is generally directed to a device retrofitted to a heat
  • This feature of the present invention enables the device to be applied to heat
  • removing ozone from a gas suspected of containing the same comprising:
  • composition and comprising an inlet for receiving a gas suspected of containing
  • composition wherein at least a portion of the first housing extends outside the
  • Figure 1 A is a schematic view of a conventional air conditioning system in the
  • Figure 1 B is a schematic view of the conventional air conditioning system
  • FIG. 2 is a schematic view of another embodiment of the invention shown
  • Figure 3 is a front schematic view of a further embodiment of the device of
  • Figure 4 is a cross-sectional view of one embodiment of a substrate for
  • Figure 5 is a cross-sectional view of another embodiment of a substrate for
  • Figure 6 is a cross-sectional view of a further embodiment of a substrate for
  • Figure 7A is a schematic view of the device of the present invention attached
  • Figure 7B is a schematic view of the device of the present invention attached
  • Figure 8 is an elevational view of an embodiment of the device of the present
  • Figure 9 is an elevational view of an embodiment of the device of the present
  • Figure 10 is a schematic view of another embodiment of the present invention.
  • Figure 1 1 is a plan view of an embodiment of a device of the present
  • the present invention is generally directed to a device which is retrofitted into
  • composition to remove ozone therefrom is a composition to remove ozone therefrom.
  • Such gases include, for example, air, waste gases, discharge gases from industrial processes, and the like.
  • composition includes any composition, material, compound and the like which can
  • compositions include by way of non-limiting examples, catalyst compositions
  • adsorbent compositions absorbent compositions, polymeric compositions, and the
  • heat exchange system includes one or more heat exchange units
  • heat exchange units include heat
  • a second flow of air which is of
  • the present invention is applicable to packaged air conditioning systems in which all
  • the air conditioning system shown in Figure 1A includes
  • ambient air 3 enters the housing 2 through the inlet 9 and comes into contact with
  • This ambient air stream (i.e. the first stream)
  • the condenser 8 receives a higher pressure, higher temperature gas from the
  • 1 1 typically comprising a series of coils. The coils are contacted by a stream of air
  • the low pressure vapor within the evaporator 11 is
  • split system Two separate housings 2, 13 commonly known as split system.
  • the present invention is also applicable to heat exchange units in which the
  • the first air stream which may contain ozone exits through one or
  • composition as shown in Figure B.
  • the composition may be incorporated into or onto a substrate 16 (such as a layer of
  • porous foam which occupies at least a portion of the space within the device 14
  • the device 14 In one embodiment of the invention as shown in Figure 1 C, the device 14
  • a solid frame 100 made of a suitable solid material such as, for example,
  • Each leg 102 of the frame is wide enough to support the
  • porous substrate 16 containing the ozone removing composition The substrate 16
  • the porous substrate 16 serves as the walls of the device large flows of ozone
  • holes may be placed in the walls to
  • the ozone removing composition forms a
  • the ozone reduced gas i.e. gas wherein the quantity of ozone has at least been substantially reduced because the ozone has been removed by the ozone removing
  • composition at a relatively low pressure drop.
  • the device in accordance with an important feature of the present invention, the device
  • numeral 20 to attach the device 14 to at least a portion of the exterior surface of the
  • the attachment mechanism 20 can include a variety of devices or
  • attachment mechanism 20 connect the device 14 to the heat exchange
  • housing 2 in an air tight sealed relationship to minimize the loss of air containing
  • the attachment mechanism 20 enables
  • the device 14 to be releasably attached to the heat exchange housing 2 of the heat
  • the device 14 may be removed
  • the ozone removing composition may be treated to rejuvenate the composition
  • the ozone removing composition as hereinafter described is provided on or
  • a substrate 16 contained within the device 14 may be employed without a
  • the substrate may be any material having a
  • substrates include plastic materials, metals, ceramics and the like. It will be appreciated that
  • ozone removing composition may be employed without a
  • the ozone removing composition be secured within the pathway of the stream of gas
  • the pressure drop can be adjusted by increasing or decreasing the
  • composition sufficient to obtain reasonable rates of ozone removal, generally at
  • ozone removing composition in the position of radial flow (i.e. placed on or forming
  • a typical shape of the device 14 is that of
  • the shape of the device is unlimited and can include
  • the substrate 16 containing an ozone removing composition placed on or forming
  • the substrate containing the ozone removing composition can be in the form
  • the foam material must be sufficiently
  • porosity of the foam material is from about 20 to 40 pores per inch.
  • foam material for use as substrates include polyurethane foams
  • a suitable pressure will depend, at least in part, on the volume of flow of the
  • a 3 ton residential air conditioning unit should preferably be from about 0.05 to
  • Increasing the surface area of the substrate can provide for increased loading
  • composition to be present per unit volume of substrate Referring specifically to
  • the substrate may be in the form of a monolith or honeycomb having a
  • the monolith 30 is comprised of a plurality of parallel channels 32
  • composition contains an ozone catalyzing composition.
  • the substrate may be in the form of a
  • the channels may be in the form
  • crimped design comprised of a plurality of sinusoidal-shaped plates 40 defining a
  • crimped design or the pleated design can be accomplished in the same manner as
  • the plates 50 may be solid thereby defining a sinusoidal pathway 52
  • the plates 50 may be coated with an ozone removing composition or the plates may
  • plates 60 which are not solid but rather are comprised of mesh like
  • the objects 62 may be regular or irregular shaped and may be from
  • the device 14 may be removable from operative
  • the top surface 15 of the device 14 may be in the
  • the device may be mounted so
  • the device may be partially mounted outside of the
  • This construction may be implemented if there is sufficient dead space within the
  • the device 14 may partially reside within
  • the device 14 may be secured in this case
  • compositions include ozone catalyzing compositions, adsorbing compositions, absorbing compositions and the like. Among the most
  • the present invention are those which contain manganese and particularly those
  • Ozone catalyzing compositions for use in the present invention comprise
  • manganese compounds including manganese dioxide, non stoichiometric
  • manganese dioxide e.g., XMnO (1 5 . 20)
  • XMn 2 O 3 wherein X is a metal ion
  • an alkali metal or alkaline earth metal e.g. sodium, potassium and
  • Preferred manganese dioxides which are nominally referred to as Mn0 2
  • manganese dioxide Mn0 2 can be any manganese dioxide Mn0 2 from 1.5 to 2.0. Up to 100 percent by weight of manganese dioxide Mn0 2 can be any manganese dioxide Mn0 2.
  • Useful and preferred manganese dioxides are alpha-manganese dioxides
  • alpha-manganese dioxide is selected from hollandite (BaMn 8 0 16 .xH 2 0),
  • the manganese dioxides useful in the present invention may have a surface
  • composition preferably comprises a binder as of the type described
  • composition can further comprise
  • precious metal components comprise precious metal components with precious metal components being the
  • oxides of precious metal including the oxides of platinum group metals and oxides
  • palladium black or platinum black of palladium or platinum also referred to as palladium black or platinum black.
  • amount of palladium or platinum black can range from about 0 to 25%, with useful
  • compositions comprising the cryptomelane
  • alpha manganese oxide which also contain a polymeric binder can result in
  • the preferred cryptomelane can be made in accordance with methods
  • the cryptomelane can be made by reacting a manganese salt including salts
  • MnCI 2 selected from the group consisting MnCI 2 , Mn(N0 3 ) 2 , MnS0 4 and Mn (CH 3 COO) 2
  • Cryptomelane is made using potassium
  • hollandite is made using barium permanganate
  • coronadite is made
  • alpha-manganese dioxide useful in the present invention can be any alpha-manganese dioxide useful in the present invention.
  • the preferred cryptomelane is "clean" or substantially free of inorganic anions, particularly on the surface. Such anions could be any suitable anions, particularly on the surface. Such anions could be any suitable anions, particularly on the surface. Such anions could be any suitable anions, particularly on the surface. Such anions could be any suitable anions, particularly on the surface. Such anions could be any suitable anions, particularly on the surface. Such anions could be any suitable anions, particularly on the surface. Such anions could be any organic anions, particularly on the surface. Such anions could be used.
  • the inorganic anions such as sulfates can be washed away with the aqueous
  • the cryptomelane is a "clean" alpha manganese dioxide.
  • the cryptomelane can be washed at
  • nitrate anions may be removed in a similar manner.
  • the acidic manganese salt solution preferably has a pH of
  • the mixture forms a slurry which is stirred at a temperature range of from about 50°C to 110°C.
  • the slurry is filtered and the filtrate is dried at a temperature
  • the resulting cryptomelane crystals have a
  • compositions to remove ozone can comprise a
  • manganese dioxide component and precious metal components such as platinum
  • manganese dioxide can also support the precious metal component.
  • group metal component preferably is a palladium and/or platinum component.
  • amount of platinum group metal compound preferably ranges from about 0.1 to
  • composition Preferably, where platinum is present it is in amounts of from about 0.1
  • volume based on the volume of the supporting article, ranging from about 0.5 to
  • the amount of palladium component preferably ranges from about 2
  • the catalyst composition volume ranging from about 10 to about 250 g/ft 3 .
  • a catalytically active component such as a precious metal catalytic
  • ком ⁇ онент can comprise a suitable support material such as a refractory oxide
  • the preferred refractory oxide can be selected from the group consisting of silica, alumina, titania, ceria, zirconia and chromia, and mixtures thereof. More
  • the support is at least one activated, high surface area compound
  • alumina selected from the group consisting of alumina, silica, titania, silica-alumina, siiica-
  • zirconia alumina silicates, alumina zirconia, aiumina-chromia and alumina-ceria.
  • the refractory oxide can be in suitable form including bulk particulate form typically
  • a useful titania sol support comprises titania
  • Also useful as a preferred support is a coprecipitate of a manganese oxide
  • metals from 5:95 to 95:5; preferably 10:90 to 75:25; more preferably 10:90 to 50:50;
  • zirconia component As recited in U.S. Patent No. 5,283,041 a zirconia oxide and
  • manganese oxide material may be prepared by mixing aqueous solutions of suitable
  • zirconium oxide precursors such as zirconium oxynitrate, zirconium acetate, zirconium oxychloride, or zirconium oxysuifate and a suitable manganese oxide
  • a useful support for the ozone catalyzing composition is selected from a
  • refractory oxide support preferably alumina and silica-alumina with a more preferred
  • support being a silica-alumina support comprising from about 1 % to 10% by weight
  • silica and from about 90% to 99% by weight of alumina.
  • compositions which can result in the conversion of ozone to oxygen comprises
  • Carulite® and/or hopcalite.
  • Manganese supported on a refractory oxide such as
  • the present invention may employ adsorption compositions supported on the
  • the adsorption compositions can be used to adsorb ozone as well as other pollutants
  • Useful supported compositions can include adsorbents such
  • zeolites are Beta
  • Carbon preferably activated carbon, can be formed into carbon adsorption
  • compositions comprising activated carbon and binders such as polymers as known
  • the carbon adsorption composition can be applied to the atmosphere
  • Activated carbon, calcium sulfate and calcium oxide can adsorb
  • the present invention may also make use of absorption compositions to
  • the device 14 is
  • the device 14 contains a basket shaped component 90 made of a porous material (e.g. wire
  • the sides 92 of the basket and the sides 17 of the device 14 define a
  • the substrate 16 typically coated on a substrate. As shown specifically in Figure 11 , the substrate 16
  • round objects 96 typically made of metal (e.g. steel) or plastic which
  • openings in the wire mesh should be such that the objects 96 can not escape from
  • composition contained on the objects 96 within the channel 94 is a composition contained on the objects 96 within the channel 94.
  • a particularly useful advantage of the present invention is that the ozone
  • removing composition may be rejuvenated by applying a fluid (e.g. water) thereto.
  • a fluid e.g. water
  • the water can come from natural rainfall or from other sources such as a garden
  • present invention therefore provides an efficient means of rejuvenating the ozone
  • the air conditioner unit was a model 38 CKB036-3
  • condenser set (condenser coil, compressor and condenser fan) and a model
  • FB4ANF036 evaporator unit comprising a coil and a fan. Ozone was provided by
  • the device of the present invention was formed of a sheet metal frame
  • ozone catalyzing composition comprised of manganese and copper oxides
  • thermocouples an array of type K thermocouples.
  • the thermostat of the air conditioner unit was adjusted to call for constant
  • the retrofit assembly was mounted on the top of the condenser set and
  • Teflon sample tubes were placed within the condenser housing and at the
  • the retrofit device included radial air flow only through four
  • porous side walls each containing a layer of Vz inch thick flat catalyzed foam with
  • catalyst area was 4.96 ft 2 .
  • the average air velocity was 400 fpm and the air
  • Each of the five panels contained a single flat half inch thick layer
  • the ambient air temperature was 76 °F.
  • Example 2 included an air flow configuration as in Example 2 but incorporated a pleated
  • the average air velocity at the top of the device was 200 fpm and at the side
  • the air temperature at the condenser outlet was 106°F while the
  • the average ozone inlet concentration was 285 ppb and the average ozone
  • the total catalyst area was 27 ft 2 .
  • the average air velocity at the top was 230 fpm and at the side was 390 fpm.
  • the air temperature at the condenser outlet was 105°F resulting in a pressure drop
  • the ambient air temperature was 66.5 °F.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Biomedical Technology (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Abstract

L'invention concerne un dispositif pour supprimer l'ozone d'un gaz suspecté d'en contenir. Ledit dispositif comporte une première enceinte raccordée activement é une deuxième enceinte contenant un système échangeur de chaleur. Ledit dispositif contient une composition de suppression de l'ozone, dont une partie s'étend à l'extérieur de la surface extérieure de la deuxième enceinte.
PCT/US1999/017637 1998-09-11 1999-08-03 Dispositif contenant une composition supprimant l'ozone, destine a etre fixe a des systemes echangeurs de chaleur WO2000015324A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU53925/99A AU5392599A (en) 1998-09-11 1999-08-03 Device containing ozone removing composition for attachment to heat exchange systems

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US15178498A 1998-09-11 1998-09-11
US09/151,784 1998-09-11

Publications (1)

Publication Number Publication Date
WO2000015324A1 true WO2000015324A1 (fr) 2000-03-23

Family

ID=22540220

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1999/017637 WO2000015324A1 (fr) 1998-09-11 1999-08-03 Dispositif contenant une composition supprimant l'ozone, destine a etre fixe a des systemes echangeurs de chaleur

Country Status (2)

Country Link
AU (1) AU5392599A (fr)
WO (1) WO2000015324A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2060427A (en) * 1979-10-03 1981-05-07 Xerox Corp Ozone removal in corona discharge devices
WO1981001250A1 (fr) * 1979-11-05 1981-05-14 Minnesota Mining & Mfg Convertisseur catalytique pour l'extraction d'ozone dans un avion
US5080882A (en) * 1989-03-10 1992-01-14 Sakai Chemical Industry Co., Ltd. Methods of ozone decomposition and catalyst structures used therein
WO1996022149A1 (fr) * 1995-01-20 1996-07-25 Engelhard Corporation Procede et appareil permettant de nettoyer l'air ambiant par contact avec un substrat fixe
WO1996034686A1 (fr) * 1995-05-02 1996-11-07 W.L. Gore & Associates, Inc. Systeme de retenue d'un catalyseur et son procede de fabrication et d'utilisation

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2060427A (en) * 1979-10-03 1981-05-07 Xerox Corp Ozone removal in corona discharge devices
WO1981001250A1 (fr) * 1979-11-05 1981-05-14 Minnesota Mining & Mfg Convertisseur catalytique pour l'extraction d'ozone dans un avion
US5080882A (en) * 1989-03-10 1992-01-14 Sakai Chemical Industry Co., Ltd. Methods of ozone decomposition and catalyst structures used therein
WO1996022149A1 (fr) * 1995-01-20 1996-07-25 Engelhard Corporation Procede et appareil permettant de nettoyer l'air ambiant par contact avec un substrat fixe
WO1996034686A1 (fr) * 1995-05-02 1996-11-07 W.L. Gore & Associates, Inc. Systeme de retenue d'un catalyseur et son procede de fabrication et d'utilisation

Also Published As

Publication number Publication date
AU5392599A (en) 2000-04-03

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