Oxygen difluoride is an inorganic compound with chemical formula OF2，It is a colorless gas and becomes a pale yellow liquid after freezing,It is highly toxic[3]。Since the electronegativity of fluorine is greater than that of oxygen, the electron shifts to the fluorine atom, so oxygen is+2 valence and fluorine is - 1 valence, so oxygen difluoride is generally considered asfluorideInstead ofoxide, and because+2 valence oxygen has strong oxidation, OFtwoIt is highly oxidizing.
Appearance: colorless gas, frozen to light yellow liquid
Solubility: slightly soluble in water, ethanol, acid and alkali, insoluble in hot water
chemical property
The oxygen in oxygen difluoride has an unusual+2 oxidation state, which has a strong oxidizing property, but its activity is not as good as that of simple fluorine.Pure oxygen difluoride is stable in a glass container, and decomposes into oxygen and fluorine above 200 ° C.
Oxygen difluoride reacts with many metals to form oxides and fluorides.It can also react with some nonmetals:
1. It reacts with phosphorus to produce phosphorus pentafluoride and phosphorus oxyfluoride.
2. React with sulfur to generate sulfur dioxide and sulfur tetrafluoride.
3. It reacts with xenon to generate xenon tetrafluoride and xenon tetrafluoromonooxide.
4. Slow reaction with water to generate hydrofluoric acid: OFtwo(aq) + HtwoO(l) = 2HF(aq) + Otwo(g)。
Molecular structure data
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Molar refractive index: 4.12
Molar volume (cmthree/mol）：45.7
Isotonic specific volume (90.2K): 70.8
Surface tension (dyne/cm): 5.7
Polarization (10-24cmthree）：1.63
toxicology data
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Acute toxicity: LCfifty: 2600ppb (inhaled by rats, 1h);1500ppb (inhalation in mice, 1h);26ppm (monkey inhalation);26ppm (dog inhalation).
Subacute and chronic toxicity: mice, rats, guinea pigs, rabbits and dogs were exposed to 0.1ppm for 7h, 30 times a day, and no toxic effect was observed;When the concentration is 2-5ppm, irritation symptoms of different degrees appear.
Others: TCLo: 500ppb.[1]
matters needing attention
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First aid measures
Skin contact: In case of burns, seek medical treatment.
Inhalation: quickly leave the site to a place with fresh air to keep the respiratory tract unobstructed.If breathing is difficult, give oxygen.If breathing stops, perform artificial respiration immediately.Get medical attention.[2]
Fire fighting measures
Hazard characteristics: the product is highly oxidizing, combustion supporting, highly toxic, extremely irritating and corrosive.Toxic smoke is generated by thermal decomposition.It can react violently with many substances, including water vapor and air, and even explode.
Hazardous combustion product: hydrogen fluoride.
Extinguishing method: firefighters must wear full body fire and gas protective clothing and extinguish the fire upwind.Cut off the air supply.Spray water to cool the container, and move the container from the fire site to an open place if possible.[2]
Emergency Management
Evacuate the personnel in the leakage contaminated area to the windward place quickly, isolate them for 450m immediately, and strictly restrict access.Cut off the ignition source.It is recommended that emergency personnel wear self-contained positive pressure respirators and anti poison clothing.Do not let the leakage come into contact with combustible materials (such as wood, paper, oil, etc.).Cut off the leakage source as much as possible.Reasonable ventilation to accelerate diffusion.If possible, the residual gas or leaked gas shall be sent to the water washing tower or the fume hood connected to the tower with an exhaust fan.Leaking containers shall be properly treated, repaired and inspected before reuse.[2]
Operational matters
It shall be tightly sealed to provide adequate local ventilation and overall ventilation.Operators must be specially trained and strictly abide by the operating procedures.It is recommended that operators wear air respirators, airtight gas suits and rubber gloves.Keep away from kindling and heat sources, and smoking is strictly prohibited in the workplace.Prevent gas or vapor from leaking into the air of the workplace.Keep away from flammable and combustible materials.Load and unload gently during transportation to prevent damage to packaging and containers.Fire fighting equipment and leakage emergency treatment equipment of corresponding types and quantities shall be provided.
Store in a cool and ventilated warehouse.Keep away from kindling and heat sources.Protect from moisture.It shall be stored separately from combustibles and edible chemicals, and mixed storage is strictly prohibited.The storage area shall be equipped with leakage emergency treatment equipment.[2]
Contact control
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Engineering control: strictly sealed, providing sufficient local ventilation and overall ventilation.
Respiratory system protection: When the concentration in the air is high, you must wear an air respirator, oxygen respirator or a long tube mask.
Eye protection: protection has been made in respiratory system protection.
Body protection: wear airtight gas protective clothing.
Hand protection: wear rubber gloves.
Other protection: smoking is strictly prohibited at the work site.Keep good hygiene habits.
Transport information
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The steel cylinder coated with polytetrafluoroethylene layer can be used for storage. A small amount of oxygen difluoride can be stored in the polytetrafluoroethylene cylinder and sealed in a low temperature and dry environment away from light.The railway transportation shall be reported to the railway bureau for trial operation, which lasts for two years.After the test run, a test run report shall be written and submitted to the Ministry of Railways to officially announce the transportation conditions.The safety helmet on the cylinder must be worn when the cylinder is used for transportation.Cylinders are generally placed horizontally, and the mouth of the cylinder should be in the same direction, not crossed;The height shall not exceed the protective fence of the vehicle, and shall be firmly clamped with triangular wood pad to prevent rolling.It is strictly prohibited to mix with combustibles or combustibles, edible chemicals, etc.Transport in the morning and evening in summer to prevent sunlight exposure.Road transportation shall be carried out according to the specified route, and it is forbidden to stay in residential areas and densely populated areas.It is forbidden to slip during railway transportation.[2]
Regulatory information
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Regulations on the Safety Management of Dangerous Chemicals (issued by the State Council on February 17, 1987), detailed rules for the implementation of the Regulations on the Safety Management of Dangerous Chemicals (HLF [1992] No. 677), regulations on the safe use of chemicals in the workplace (LBF [1996] No. 423) and other regulations have made corresponding provisions on the safe use, production, storage, transportation, loading and unloading of dangerous chemicals;The classification and marks of commonly used hazardous chemicals (GB 13690-92) classify the substance as Class 2.3 toxic gas;In the classification, classification and product name number of highly toxic substances (GA 57-93), the liquefied or compressed products of this substance are classified as Class I Class A inorganic highly toxic substances.[2]
