Vapor pressure hydrogen bromide

Technical 48% and 62% acids are colorless to light yellow Hquids available in dmms, 15,140-L tank trailers, and 37,850-L tank cars. They are classified under DOT regulations as corrosive materials. Anhydrous hydrogen bromide is available in cylinders, under its vapor pressure of approximately 2.4 MPa (350 psi) at 25°C. It is classified as a nonflammable gas. 

Polonium tetrabromide is a bright red solid which melts, in bromine vapor, at about 330°C (7, 75), and boils at 360°C/200 mm 75). It is prepared by heating polonium metal in bromine vapor at 200 mm pressure for 1 hour at 250°C (7, 75) or, more rapidly, in a stream of nitrogen saturated with bromine vapor at 200°-250°C, and by heating polonium dioxide in hydrogen bromide or by evaporating a solution of polonium(IV) in hydro-... 

Hydrogen Bromide — Fire Hazards Flash Point (deg. F) Not flammable Flammable Limits in Air (%) Not flammable Fire Extinguishing Agents Not pertinent Fire Extinguishing Agents Not To Be Used Not pertinent Special Hazards of Combustion Products Not pertinen V.Behavior in Fire Pressurized containers may explode and release toxic and irritating vapors Ignition Temperature... 

Tetrahydronaphthalene is readily available, being used commercially under various trade names (Tetralin, Tetranap, etc.) as a solvent and as a paint and varnish thinner. The presence of decahydronaphthalene or of small quantities of naphthalene does not lead to any contamination of the hydrogen bromide. The decahydro- compound may be used in plaee of the tetrahydro- compound, but it is more volatile (b.1930, vapor pressure 0.8 mm. at 15°C.) and reacts more slowly. 

Boron Iribromide (CAS 10294-33-4) Corrosive decomposed by tissue moisture to hydrogen bromide (see p 140) and boric acid (see p 135). Severe skin and eye burns may result from direct contact. Vapors highly irritating to eyes and respiratory tract. 1 ppm (C) 3 0 2 W Colorless fuming liquid. Reacts with water, fomiing hydrogen bromide and boric acid. Vapor pressure is 40 mm Hg at14°C (57°F). 

Bromoform (tribromomethane [CAS 75-25-2]) Vapors highly irritating to eyes and respiratory tract. Well absorbed by inhalation and skin contact. CNS depressant. Liver and kidney injuiy may occur. Two preliminary tests Indicate that it may be an animal carcinogen. 0.5 ppm, S,A3 850 ppm Colorless to yellow liquid. Chloroform-like odor and Irritahon are adequate warning properhes. Vapor pressure is 5 mm Hg at 20°C (68°l. Not combustible. Thermal-breakdown products Include hydrogen bromide and bromine. 

Difluorodibromomethane (dibromodifluoromethane, Freon 1292 [CAS 75-61-6]) Based on animal tests, vapors irritate the respiratory tract. A CNS depressant. By analogy to other freons, may cause cardiac arrhythmias. In test animals, high-level chronic exposures caused lung, liver, and CNS injury. See also p 209. 100 ppm 2000 ppm Heavy, volatile, colorless liquid vinth an obnoxious, distinctive odor. Vapor pressure is 620 mm Hg at 20 C (68°F). Not combustible. Thermal-breakdown products include hydrogen bromide and hydrogen fluoride. 

Hydrogen bromide (HBr [CAS 10035-10-6]) Direct contact with concentrated solutions may cause corrosive acid burns. Vapors highly irritating to eyes and respiratory tract pulmonary edema may result. 3 ppm (C) 30 ppm 3 0 0 Colorless gas or pressurized liquid. Acrid odor and irritation occur near the TLV and are adequate warning properties. Not combustible. 

Bolling point, °C 144 Melting point, C -69 Relative density (water-1) 1.6 Relative vapor density (air -1) 6.4 Relative density at 20 ° C of saturated mixture vapor/alr(alr 1) 1.03 Vapor pressure, mm Hg at 20 0 6.0 Solubility In water none Relative molecular mass 167.4 Qroaa formula CjM BrCl COLORLESS LIQUID Vapor mixes readily with air. Decomposes in flame or on hot surface, giving off toxic and corrosive vapors (- hydrog n bromide, hydrogen chtoride). Decomposes when heated above boiling point, giving off oorrosive vapors. ... 

Hydrogen bromide is shipped as compressed liquefied gas under its own vapor pressure in cylinders. The maximum filling density for hydrogen bromide is 136 percent. 

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