Bromine trifluoride

Bromine trifluoride, inorganic compound, amber liquid.Smoke in the air, can corrode the skin, non-combustible, but the chemical is very active.In contact with acid, it can release highly toxic bromine vapor and fluorine.Reacts violently with water, releasing highly toxic fumes.It can make combustible or organic matter ignite and burn in the fire field, which can promote the fire, strongly hydrolyze, and even explode.Curable at low temperatures.It has strong oxidizing and strong reactivity.It can be obtained by reacting fluorine and bromine in a 1:3 molar ratio.It can be used as an inert solvent to dissolve fluorides such as sulfur hexafluoride, molybdenum hexafluoride, and tungsten hexafluoride.It can also be used as a fluorinating agent for inorganic and organic substances.

Overview

English name: Bromine trifluoride.

Molecular formula: BrF3

Use

Fluorinating agents, electrolytic solvents, rocket propellants.

Manufacturing method

(1) 2B+3Br→ 2BBr

(2) B2H6+6Br2→2BBr3+6HBr

(3) B2O3+ 6HBr(gas)→2BBr3+3H2O

(soluble in absolute alcohol)

Physical and chemical properties

Molecular weight: 136.899

Melting point (101.325kPa): 8.87°C

Boiling point (101.325kPa): 125.75°C

Liquid density (125.75°C, 101.325kPa): 2518kg/m

Relative density (air=1, 15°C, gas): 2.37

Critical temperature: 327 ℃

Heat of fusion (8.77℃): 87.85kJ/kg

Heat of vaporization (125.75℃, 101.325kPa): 311.92kJ/kg

Specific heat capacity (gas, 25℃): Cp=485.67J/(kg·K)

(liquid, 27.4℃ )): 911.11J/(kg·K)

Vapor pressure (40℃): 2.55kPa

(100℃): 42 kPa

(140℃): 157kPa

Viscosity (0℃): 0.0139mPa·S

Refractive index (liquid, 25℃, 101.325kPa): 1.4536

Toxicity level: 4

Flammability level: 0 Flammability

level: 3

Bromine trifluoride is a colorless or pale yellow liquid at room temperature and pressure.Exposure to the air can produce thick smoke, and it does not burn in the air.The chemical properties are very active, and it is a strong oxidant, which can make combustibles or organic substances ignite, and can contribute to the fire in the fire field.Reacts violently with water, releasing highly toxic fumes.Contact with acids or acid mist can also release highly toxic bromine vapor and fluorine.

toxicity

Allowable concentration: 0.1PPm.

Bromine trifluoride fumes can severely irritate the eyes, skin and mucous membranes of the respiratory tract.

Security

Keep the air fresh and dry in the workplace.

Most common metal materials can be used at low or room temperature, and only Inconel, Monel and Nickel can be used at high temperature.All devices should undergo the following treatments: ① Wash with 10% to 20% nitric acid solution to oxidize all metal parts, then wash with distilled water; ② Degrease with trichloroethylene; ③ Dry with acetone; ④ Use helium leak detector Leak detection; ⑤Bake the device at 120℃ for at least 30 minutes, while vacuuming to P≤10mmHg.In this way, the moisture adsorbed on the tube wall can be prevented from turning BrF3 into hydrofluoric acid; ⑥Passivation by filling with F2 gas makes the tube wall form a protective film.

When the device is suspended or shut down for a long time, the internal BrF3 can be released, keep the vacuum inside or fill with nitrogen, and never open to the atmosphere.

The leaked material should be absorbed by sand and then poured to the open place for burial, and the polluted ground should be ventilated and evaporated to discharge the residual liquid.When fighting fires with fluorine tribromide, it is necessary to avoid contact between bromine trifluoride and water to prevent bromine trifluoride from reacting violently with water and releasing smoke and poisoning.If it is a small fire, smother the fire with carbon dioxide or dry chemical.Keep containers near fire areas cool with water spray.