GB440943A - Improvements in or relating to filtering masses for gas masks for affording protection against hydrocyanic acid - Google Patents

Improvements in or relating to filtering masses for gas masks for affording protection against hydrocyanic acid

Info

Publication number
GB440943A
GB440943A GB24505/35A GB2450535A GB440943A GB 440943 A GB440943 A GB 440943A GB 24505/35 A GB24505/35 A GB 24505/35A GB 2450535 A GB2450535 A GB 2450535A GB 440943 A GB440943 A GB 440943A
Authority
GB
United Kingdom
Prior art keywords
salt
precipitated
basic
manganese
protection against
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.)
Expired
Application number
GB24505/35A
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.)
Pirelli and C SpA
Original Assignee
Pirelli SpA
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 Pirelli SpA filed Critical Pirelli SpA
Publication of GB440943A publication Critical patent/GB440943A/en
Expired legal-status Critical Current

Links

Classifications

    • AHUMAN NECESSITIES
    • A62LIFE-SAVING; FIRE-FIGHTING
    • A62BDEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B21/00Devices for producing oxygen from chemical substances for respiratory apparatus

Landscapes

  • Health & Medical Sciences (AREA)
  • Emergency Medicine (AREA)
  • Pulmonology (AREA)
  • General Health & Medical Sciences (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Respiratory Apparatuses And Protective Means (AREA)

Abstract

A gas-mask filter for protection against hydrocyanic acid comprises an inorganic basic salt and an oxide of a heavy metal, e.g. iron, chromium, nickel or manganese. Diluents such as talc, textile fibres, silica gel, and active carbon may be incorporated. A suitable filter has the composition by weight: basic copper carbonate 60, manganese dioxide 90, and diluent 75 parts. The components may be ground together, preferably while wet, dried at a temperature, e.g. 100-120 DEG C., such that no decomposition occurs, and moulded. Alternatively, the metal oxide and basic salt may be precipitated and mixed in one operation. Manganese dioxide may be precipitated from a solution of a manganese salt, the precipitate washed, and suspended in a liquid containing a metallic salt from which a basic salt is precipitated. A mixture of one or more oxides and one or more basic salts of the same metal may be used. The porosity of the product is determined by the liquid medium employed and the moulding pressure. The filter may be employed in alternate layers with other filtering materials.
GB24505/35A 1934-09-18 1935-09-02 Improvements in or relating to filtering masses for gas masks for affording protection against hydrocyanic acid Expired GB440943A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT440943X 1934-09-18

Publications (1)

Publication Number Publication Date
GB440943A true GB440943A (en) 1936-01-08

Family

ID=11255886

Family Applications (1)

Application Number Title Priority Date Filing Date
GB24505/35A Expired GB440943A (en) 1934-09-18 1935-09-02 Improvements in or relating to filtering masses for gas masks for affording protection against hydrocyanic acid

Country Status (1)

Country Link
GB (1) GB440943A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE976796C (en) * 1954-03-27 1964-04-30 Auergesellschaft Gmbh Process for the production of activated carbon compounds containing copper and chromium which absorb hydrogen cyanide and cyanogen chloride
US4065406A (en) * 1975-01-29 1977-12-27 Matsushita Electric Industrial Co., Ltd. Catalyst for use in treating gas
US20110048107A1 (en) * 2009-09-03 2011-03-03 Dräger Safety AG & Co. KGaA Device for gas analysis

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE976796C (en) * 1954-03-27 1964-04-30 Auergesellschaft Gmbh Process for the production of activated carbon compounds containing copper and chromium which absorb hydrogen cyanide and cyanogen chloride
US4065406A (en) * 1975-01-29 1977-12-27 Matsushita Electric Industrial Co., Ltd. Catalyst for use in treating gas
US20110048107A1 (en) * 2009-09-03 2011-03-03 Dräger Safety AG & Co. KGaA Device for gas analysis
US8646341B2 (en) * 2009-09-03 2014-02-11 Dräger Safety AG & Co. KGaA Filtration system for gas analysis

Similar Documents

Publication Publication Date Title
GB440943A (en) Improvements in or relating to filtering masses for gas masks for affording protection against hydrocyanic acid
GB862577A (en) Process for improving the stability of polyamide structures to light
GB1364383A (en) 1 - 2-benzothiazolyl -1/3 - dialkyl - ureas process for their production and their use as herbicides
GB662800A (en) Improvements in or relating to the preparation of salts of cyclohexylsulphamic acid
GB720284A (en) Improvements in and relating to the production of colour photographic images
GB692258A (en) Improvements relating to the anti-shrink and anti-felt treatment of wool
GB653588A (en) The manufacture of glyoxal and polyglyoxal
US1349802A (en) Process of manufacture of picric acid
US2493068A (en) N,n'-diacyl-tetrahydro-1,3,5-oxadiazines
US1884558A (en) Pulverulent phosphorus pentoxide
US2077591A (en) Mercurated salicyl aryl amides
GB988253A (en) Production of azoalkanes
AT147229B (en) Breathing filters for gas masks.
AT218475B (en) Process for the production of non-dusting sodium perborate containing water of crystallization with reduced bulk density
GB703150A (en) Improvements in or relating to process for the production of anhydrous hydrazine
GB445206A (en) Improvements in and relating to the production of chlorinated compounds of isopropyl amine
GB293962A (en) Improvements in and relating to the treatment of carbonaceous absorbent material for use in respirators and the like
FI6602A (en) Procedure for preparing red soil and pure glauber's salt from liquids obtained by pickling iron with acidic alkali sulphate or sulfuric acid
GB746429A (en) Diethanolamine salt of -a,-a-dichloropropionic acid
GB292388A (en) Improved manufacture of marble substitutes
CH306896A (en) Process for the preparation of an anthraquinone vat dye.
GB497580A (en) Improvements in or relating to heat transmitting media
CH261868A (en) Process for the production of a vat dye.
GB301325A (en) Improvements in the manufacture of benzene and derived hydrocarbons by condensation of acetylene
CH304292A (en) Process for the preparation of an anthraquinone vat dye.