EP0193861A2 - Filtre à air respiratoire contre le monoxyde de carbone - Google Patents

Filtre à air respiratoire contre le monoxyde de carbone Download PDF

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Publication number
EP0193861A2
EP0193861A2 EP86102494A EP86102494A EP0193861A2 EP 0193861 A2 EP0193861 A2 EP 0193861A2 EP 86102494 A EP86102494 A EP 86102494A EP 86102494 A EP86102494 A EP 86102494A EP 0193861 A2 EP0193861 A2 EP 0193861A2
Authority
EP
European Patent Office
Prior art keywords
catalyst
air filter
breathing air
filter layer
metal
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.)
Withdrawn
Application number
EP86102494A
Other languages
German (de)
English (en)
Other versions
EP0193861A3 (fr
Inventor
Carl-Ernst Dr. Van Der Smissen
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.)
Draegerwerk AG and Co KGaA
Original Assignee
Draegerwerk AG and Co KGaA
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 Draegerwerk AG and Co KGaA filed Critical Draegerwerk AG and Co KGaA
Publication of EP0193861A2 publication Critical patent/EP0193861A2/fr
Publication of EP0193861A3 publication Critical patent/EP0193861A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B19/00—Cartridges with absorbing substances for respiratory apparatus
    • A62B19/02—Cartridges with absorbing substances for respiratory apparatus with oxidising agents

Definitions

  • the invention relates to a carbon oxide breathing air filter with a first filter layer through which at least one-way breathing flows and which contains a first CO catalyst.
  • a carbon oxide breathing air filter intended for one-way breathing is known, which as an oxidizing catalyst hopkalite, i.e. contains a mixture of copper oxide and manganese dioxide, as well as other filter materials to protect the catalyst against moisture.
  • This catalyst can oxidize high CO concentrations to harmless CO 2 and shows only a slow decrease in the catalyst effect during its possible service life in the dry state.
  • the moisture sensitivity of the hopkalite catalyst poses a particular risk of use because the respective water vapor loading condition cannot be determined with certainty after use of the filter for a long time before use.
  • Precious metals in particular metals from the group of platinum metals on a porous carrier made of activated carbon or proteins, are also known as catalysts for carbon oxide breathing air filters (publication by the American Society of Mechanical Engineers, ASME 77 ENAs-28, 1957.5).
  • Precious metal catalysts of this type achieve a sufficient protective effect only after a certain formation time when high CO concentrations are rapidly flooded, but are considerably less sensitive to the influence of water vapor than hopkalite.
  • the invention is based on the task of developing a carbon oxide breathing air filter of the type specified at the outset in such a way that a relatively long service life is achieved when used immediately under high CO concentrations and high atmospheric humidity.
  • the first filter layer is combined with a second filter layer which contains a second CO catalyst, the catalyst action and water vapor sensitivity of which differ from that of the first CO catalyst is.
  • a CO catalyst that allows high CO concentrations right from the start, but loses its activity after a relatively short time under the influence of atmospheric humidity, can be combined with another CO catalyst that only takes a certain time to act achieves a sufficient filter effect, but then maintains its activity for a long time even under high humidity.
  • the first CO catalyst can expediently contain at least one metal or a metal compound from the group of noble metals, while the second CO catalyst upstream of the inhaled air contains oxides of base metals.
  • the second CO catalyst oxidizes only a small amount of CO after a long period of operation, it is ensured that no dangerous CO concentrations occur behind the first catalyst, since the activity of the first catalyst increases at least to the same extent as the activity of the second catalyst decreases.
  • the first CO catalyst is a metal or a metal compound from the group of platinum metals applied to a support
  • the second CO catalyst contains a mixture of copper oxide and a manganese oxide, preferably hopkalite.
  • a metal from the group of platinum metals such as platinum, palladium, rhodium or ruthenium, is used in the first catalyst, either elementarily, as an oxide or as a salt, for example as a chloride.
  • This metal or the metal compound can advantageously on a granulated, porous carrier made of activated carbon, active alumina, silica gel, zeolite or plastic fiber material, optionally using metallic or oxidic underlayers.
  • the combination of the noble metal catalyst, which contains at least one metal from the group of platinum metals on a corresponding support, with a hopkalite catalyst connected upstream in the direction of flow of the inhaled air results in a respiratory air filter which has a relatively long service life under high impact and continuous loads.
  • the combination effect of both catalysts can be explained by the fact that the platinum catalyst forms carbonyl on its surface under the action of CO. This can be reacted with oxygen and broken down as long as the surface of the catalyst is only partially covered with carbonyl and further oxygen access is possible. A high carbon concentration immediately forms a coherent carbonyl layer that is difficult to break open and blocks the catalytic effect.
  • the upstream hopkalite catalyst prevents high CO concentrations from striking directly onto the platinum catalyst, so that the carbonyl layer can expand in the depth of the support, leaving the pores that allow oxygen access free.
  • the platinum catalytic converter is offered the possibility of uniform formation, which enables the unfolding the long-lasting catalyst effect guaranteed.
  • the breathing air filter described can be used both in one-way operation, with valve exhalation, and in pendulum breathing.
  • One-way breathing delays the harmful water vapor loading of the hopkalite catalyst.
  • the breathing air filter consists of a filter housing 1 in which a first filter layer 2 with a platinum metal catalyst is accommodated between holding surfaces 3 with low flow resistance.
  • the platinum metal catalyst is e.g. made of granular aluminum oxide with an occupancy of 0.5% palladium.
  • a second filter layer 4 is provided upstream of the inhaled air and contains granulated hopkalite as the second CO catalyst.
  • An air-permeable cover 5 closes the filter housing 1.

Landscapes

  • Health & Medical Sciences (AREA)
  • Pulmonology (AREA)
  • General Health & Medical Sciences (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Catalysts (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
  • Respiratory Apparatuses And Protective Means (AREA)
EP86102494A 1985-03-02 1986-02-26 Filtre à air respiratoire contre le monoxyde de carbone Withdrawn EP0193861A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3507486 1985-03-02
DE19853507486 DE3507486A1 (de) 1985-03-02 1985-03-02 Kohlenoxid-atemluftfilter

Publications (2)

Publication Number Publication Date
EP0193861A2 true EP0193861A2 (fr) 1986-09-10
EP0193861A3 EP0193861A3 (fr) 1989-02-22

Family

ID=6264069

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86102494A Withdrawn EP0193861A3 (fr) 1985-03-02 1986-02-26 Filtre à air respiratoire contre le monoxyde de carbone

Country Status (3)

Country Link
EP (1) EP0193861A3 (fr)
JP (1) JPS61209674A (fr)
DE (1) DE3507486A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995007115A1 (fr) * 1993-09-08 1995-03-16 Coal Industry (Patents) Limited Ameliorations d'un dispositif de protection respiratoire ou s'y rapportant

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3719420A1 (de) * 1987-06-11 1988-12-29 Sandler Helmut Helsa Werke Atemschutzmaske
DE4014518A1 (de) * 1990-05-07 1991-11-14 Hoelter Heinz Bakterizider und fungizider staubabscheidender mehrschichtenfilter
US5964218A (en) * 1994-08-31 1999-10-12 Lifepro, Inc. Face mask with back-up smoke inhalation protection and method of operation
TW287952B (fr) * 1994-08-31 1996-10-11 Lifepro Inc
US5690101A (en) * 1995-07-14 1997-11-25 Kutta; Helmuth W. Portable air purifier with chemical reaction zone
KR101332199B1 (ko) * 2012-06-21 2013-11-25 주식회사 이엠따블유에너지 휴대용 공기 정화기

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE671176C (de) * 1934-12-06 1939-02-11 Auergesellschaft Akt Ges Atemschutzfilter gegen Kohlenoxyd
DE1246416B (de) * 1965-05-17 1967-08-03 Draegerwerk Ag Kohlenmonoxyd-Filterselbstretter
EP0155991A1 (fr) * 1984-02-14 1985-10-02 Drägerwerk Aktiengesellschaft Appareil respiratoire pour la protection contre le monoxyde de carbone

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57195475A (en) * 1981-05-28 1982-12-01 Matsushita Electric Ind Co Ltd Gas mask

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE671176C (de) * 1934-12-06 1939-02-11 Auergesellschaft Akt Ges Atemschutzfilter gegen Kohlenoxyd
DE1246416B (de) * 1965-05-17 1967-08-03 Draegerwerk Ag Kohlenmonoxyd-Filterselbstretter
EP0155991A1 (fr) * 1984-02-14 1985-10-02 Drägerwerk Aktiengesellschaft Appareil respiratoire pour la protection contre le monoxyde de carbone

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995007115A1 (fr) * 1993-09-08 1995-03-16 Coal Industry (Patents) Limited Ameliorations d'un dispositif de protection respiratoire ou s'y rapportant

Also Published As

Publication number Publication date
JPS61209674A (ja) 1986-09-17
DE3507486A1 (de) 1986-09-04
EP0193861A3 (fr) 1989-02-22
DE3507486C2 (fr) 1987-01-02

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Inventor name: VAN DER SMISSEN, CARL-ERNST, DR.