What Are the Industrial Uses of Phosphorus Bromide?

Phosphorous bromide is also known as phosphorus bromide. It is a colorless liquid with irritating odor. It emits violent smoke in the air. It is poisonous. It can be seriously poisoned by ingestion or inhalation of dust and liquid. It reacts violently with water to generate hydrogen bromide and phosphorous acid, which emits irritating vapors and causes corrosive burns. Vapors and liquids can severely irritate the eyes, mucous membranes, skin and respiratory system, causing burns. Frequent inhalation of low concentrations of vapors can damage the respiratory tract. Extremely easy to hydrolyze. ^[1]

Chinese name: phosphorus tribromide

Chinese alias: phosphorus (III) bromide

English name: Phosphorus tribromide

English alias: phosphorus tribromide

Molecular formula: Br ₃ P

Molecular weight: 270.68600

Exact mass: 267.972900

PSA: 13.59000

LogP: 3.39800 ^[2]

CAS number: 7789-60-8

MDL number: MFCD00011436

EINECS number: 232-178-2

RTECS number: TH4460000 ^[1]

1. Reference value for calculation of hydrophobic parameters (XlogP): 2.8

2. Number of hydrogen-bonded donors: 0

3. Number of hydrogen bond acceptors: 0

4. Number of rotatable chemical bonds: 0

5. Number of tautomers: none

6. Topological molecular polar surface area: 0

7. Number of heavy atoms: 4

8. Surface charge: 0

9, complexity: 8

10. Number of isotope atoms: 0

11. Determine the number of atomic stereocenters: 0

12. Uncertain number of atomic stereocenters: 0

13. Determine the number of chemical bond stereocenters:

14. Uncertain number of chemical bond stereocenters: 0

15. Number of covalent bond units: 1 ^[1]

Appearance and properties: colorless or light yellow fuming liquid with irritating odor

Phosphorus tribromide changes its color with temperature from orange yellow, dark yellow to black as the temperature rises. It reacts with water to decompose into phosphorous acid and hydrobromic acid and releases a lot of heat. Interaction with ethanol to decompose into phosphoric acid and ethyl bromide. Heating with oxygen produces phosphoryl bromide and bromine, and further acts to form phosphoryl bromide and phosphorus pentabromide. Reacts with chlorine to form phosphorus trichloride and bromine. Does not work with iodine. It reacts with hydrogen sulfide to generate phosphorus trisulfide and hydrogen bromide. ^[4]

(1) Take the aqueous solution of this product and add

1. Red phosphorus and liquid bromine are used as raw materials, and phosphorus tribromide is used as a solvent to perform a reaction to obtain phosphorus tribromide.

2.The reaction device is a 1000mL double neck grinding mouth

Conversion of alcohol to bromide: Phosphorus tribromide is commonly used to convert alcohol to bromide. The conditions of the conversion reaction are variable, and each bromine atom in the reagent can participate in the conversion. Chiral alcohols can be converted into chiral bromides, and the reaction is usually carried out under mild conditions (formula 1, formula 2):

Phosphorus tribromide health hazards

Invasion: inhalation, ingestion, percutaneous absorption.

Health hazards: Strong irritating effects on eyes, skin, mucous membranes and respiratory tract. Inhalation may be caused by laryngospasm, bronchospasm, edema, inflammation, chemical pneumonia, and pulmonary edema. Poisoning manifestations include burning, coughing, wheezing, laryngitis, shortness of breath, headache, nausea, and vomiting.

Emergency treatment of phosphorus tribromide leakage

Evacuate personnel from the leaked contaminated area to a safe area, and prohibit irrelevant personnel from entering the contaminated area. It is recommended that emergency handlers wear self-contained breathing apparatus and chemical protective clothing. Do not directly contact the leakage, do not allow the leakage to come in contact with flammable substances (wood, paper, oil, etc.), and plug it under safety conditions. Water spray slows volatilization (or diffusion), but do not spray water directly on leaks or leaks. Sprinkle the ground with soda ash, and then rinse with a large amount of water. The diluted washing water is put into the waste water system or a small amount of water is added one by one, and the solution is left to stand. If there is a large amount of leakage, remove it under the guidance of a technician.

Phosphorus tribromide protective measures

Respiratory protection: When it may be exposed to vapors, you must wear a gas mask or air supply helmet. It is recommended to wear self-contained breathing apparatus for emergency or rescue.

Eye protection: Wear chemical safety protective glasses.

Protective clothing: Wear work clothes (made of anticorrosive materials).

Hand protection: Wear rubber gloves.

Other: After work, shower and change clothes. Store clothes contaminated by poisons separately and wash them before reuse. Maintain good hygiene.

Phosphorus Tribromide First Aid Measures

Skin contact: Wipe off the poison with soft paper or cotton as soon as possible, and then soak with 3% sodium bicarbonate solution. Rinse thoroughly with water. Seek medical attention.

Eye contact: Raise the eyelids immediately and rinse with running water for 10 minutes or with 2% sodium bicarbonate solution.

Inhalation: Quickly leave the scene to fresh air. Keep warm and keep your airways open. If necessary, give artificial respiration. Seek medical attention.

Ingestion: Rinse mouth immediately and drink milk or egg white when patient is awake. Seek medical attention immediately.

Fire fighting methods: dry powder, sand, carbon dioxide. Water is prohibited. ^[3]