Goal
Provide a rapid, portable source of breathable oxygen for emergency or medical situations.
Problem
Need for on-demand oxygen in suffocating conditions and safe handling of exothermic oxygen generators.
Concept Summary
A non-pressurized canister contains a chemical oxygen-liberating mixture (e.g., hydrogen peroxide + manganese catalyst, sodium peroxide, or sodium chlorate). Upon ignition the reaction rapidly produces oxygen. Heat generated is absorbed by a layer of hydrate salts that decompose and vaporize water, lowering surface temperature so the canister can be handled safely.
Principles
- Exothermic decomposition of oxidizer chemicals
- Catalytic activation of peroxide reactions
- Heat absorption via hydrate salt decomposition and water vaporization
- Gas flow through snap-on cap to mask
Scientific Domains
Materials
- Hydrogen peroxide (7-10% aqueous solution)
- Manganese (reagent grade)
- Sodium peroxide (powder or granular)
- Sodium chlorate
- Iron
- Barium peroxide
- Boron
- Asbestos
- Glass powder
- Epsom salt (MgSO4*7H2O)
- Trisodium phosphate (Na3PO4*12H2O)
- Glauber's salt (Na2SO4*10H2O)
- Aluminum foil
- Refractory fiber insulation
- Tin-plated steel can
Mechanisms of Action
- Hydrogen peroxide -> water + oxygen (catalyzed by manganese)
- Sodium peroxide + water -> sodium hydroxide + oxygen
- Sodium chlorate candle combustion -> oxygen + heat
- Hydrate salt breakdown absorbs heat and releases water vapor
Energy Sources
Applications
- Rescue and emergency breathing
- Medical oxygen delivery in field settings
- Submarine or underwater escape
- Fire-fighter self-contained breathing apparatus
Claimed Performance
Oxygen generation begins within seconds; a typical canister delivers ~5.5 L min^-^1 of medically pure oxygen for 15 min; surface temperature reduced to ~160 deg F (~=71 deg C) allowing comfortable handling.
Experimental Evidence
Patent specifications describe performance figures (e.g., 5.5 L min^-^1, 15 min operation, temperature reduction to 160 deg F) but no independent test data are provided.
Limitations
- Exothermic heat must be managed
- Limited operation time (~=15 min)
- Handling of hazardous chemicals (hydrogen peroxide, sodium chlorate)
- Disposable canister generates waste
- Potential moisture buildup in insulation
Red Flags
- Use of strong oxidizers (hydrogen peroxide, sodium chlorate) poses fire and chemical hazards
- High surface temperatures require reliable insulation
- Improper disposal could create environmental concerns
