Barium peroxide, decomposition

Violence of reaction depends on concentration of acid and scale and proportion of reactants. The following observations were made with additions to 2-3 drops of ca. 90% acid. Nickel powder, becomes violent mercury, colloidal silver and thallium powder readily cause explosions zinc powder causes a violent explosion immediately. Iron powder is ineffective alone, but a trace of manganese dioxide promotes deflagration. Barium peroxide, copper(I) oxide, impure chromium trioxide, iridium dioxide, lead dioxide, manganese dioxide and vanadium pentoxide all cause violent decomposition, sometimes accelerating to explosion. Lead(II) oxide, lead(II),(IV) oxide and sodium peroxide all cause an immediate violent explosion. 

Barium peroxide decomposes to barium oxide and oxygen when heated to 700°C. At lower temperatures, decomposition occurs slowly. It also decomposes slowly in contact with water, forming barium hydroxide. It reacts with dilute acids to form hydrogen peroxide ... 

Performic Acid. Addition of barium peroxide to 90% acid causes violent decomposition.15... 

Metals or Metal Oxides. Explosions result on contact with Ni powder, Hg, colloidal Ag, thallium powder, Zn powder, PbO, Pb304, and Na202 violent decomposition occurs with barium peroxide, CuO, impure Cr03, iridium dioxide, Pb02, Mn02, and V205 and with Fe powder contaminated with a trace of Mn02.3... 

Pure barium peroxide hydrate Ba02-8H20 is precipitated when barium hydroxide is added to a hydrogen peroxide solution. Hydrogen peroxide is not a stable substance its solution decomposes slowly in any event into oxygen and water. This decomposition is greatly hastened by suspended solid matter and by hydroxyl ions in the following preparation one should work to minimize the amount of this decomposition. 

Phosphoric acid is more advantageous than sulphuric acid for the decomposition of barium peroxide.When it is used it is possible to obtain a solution with 10 to 16 per cent of H2Oa, because contrary to sulphuric acid even a considerably concentrated phosphoric acid ensures the satisfactory decomposition of barium peroxide. The barium phosphate Ba3(P04)2 formed in the process, which is easy to filter, also removes other impurities (Fe, Mn, A1 etc.) if they had been converted during the final stage of the process to a less soluble form by careful neutralization of the acid solution by barium hydroxide or carbonate. The precipitate of Ba3(P04)2, which contains also impurities, is filtered off. The hydrogen peroxide solution obtained is fairly stable because a small amount of phosphoric acid is present. 

SAFETY PROFILE Central nervous system effects at high concentrations. An asphyxiant. Flammable gas. Highly dangerous fire hazard when exposed to heat or flame can react vigorously with oxidizers. Explosive in the form of vapor when exposed to heat or flame. Explosive reaction with CIO2. Violent exothermic reaction with barium peroxide + heat. To fight fire, stop flow of gas. When heated to decomposition it emits acrid smoke and irritating fumes. 

Hydrogen peroxide was discovered in 1818 and its use in bleaching textiles was first suggested in 1866. However, its high cost limited its use in cotton bleaching until 1935. The problem was partially solved by the process using barium peroxide and phosphoric acid. In 1926 hydrogen peroxide was manufactured by an electrolytic process based on the decomposition of persulphuric acid (H SOj) [15]. 

These results are to be contrasted with tho.se obtained with solid catalysts such as copper, copper oxide, silver oxide, barium peroxide, platinum oxide, and active charcoal in which only very small amounts of hydrogen and carbon monoxide were obtained. From the fact that rather high yields of oxygenated compounds could also be obtained with the gaseous catalyst, it would seem that decomposition of these compounds played ail important part in the production of the hydrogen and carbon monoxide. 

The decomposition of pure barium peroxide is known to begin at 600 °C and dissolution decreases this temperature [114]. 

AERO-CYANAMID (156-62-7) Combustible solid. Dust or powder forms explosive mixture with air. Contact with water, steam causes decomposition, forming acetylene gas, ammonia, and calcium hydrogen cyanamide. Violent reaction with strong oxidizers, fluorine, strong acids. Incompatible with barium peroxide, boric acid, dry hydrogen, hydrogen peroxide. Contact with all solvents tested also causes decomposition. 

EXPLOSION and FIRE CONCERNS a flammable liquid NFPA rating Health 2, Flammability 2, Reactivity 1 explosive reactions with barium peroxide, boric acid, hydrochloric acid + water, potassium permanganate incompatible with 2- amino ethanol, aniline, glycerol, hydrogen fluoride, permanganates, sodium hydroxide, sodium peroxide, sulfuric acid, water when heated to decomposition it emits toxic fumes such as acetic acid and carbon monoxide use carbon dioxide, dry chemical, water mist, or alcohol foam for firefighting purposes. 

EXPLOSION and FIRE CONCERNS flammable dangerous fire risk when exposed to heat or flame NFPA rating Health 1, Flammability 4, Reactivity 0 explosive in vapor form when exposed to heat or flame reacts explosively with chlorine dioxide violent exothermic reaction with barium peroxide and heat incompatible with strong oxidizers heating to decomposition emits irritating fumes stop flow of gas or use agent suitable for firefighting purposes. 

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