phosphine
First, product introduction
Phosphin under normal temperature and pressure to have a dislike of garlic and fishy odor colorless toxic gases, flammable and explosive, the air will burn, if
With a small amount of P2H4, it can also spontaneous combustion in air at room temperature (pure PH3 is not under fire at 149 C). The decomposition of phosphane at more than 375 C is needed.
Decomposed into P and H 2, 2PH 3, the reaction: 3H2 = 2P. The alkalinity of the phosphane is weaker than the ammonia, but the reducibility is stronger, and many oxidizing agents can be reduced.
This feature is the basis of oxidation detoxification.
Chinese Name: phosphane / phosphine
Molecular formula: PH3
English Name: Phosphine
Relative molecular weight: 34
CAS No:7803-51-2
Risk category: category 2.3
UN No:2199
Solubility: Micro dissolved in cold water
Melting point: -133.8 C
Boiling point: -87.7 C
Critical temperature: 51.6 degrees centigrade
Liquid density (25 C):0.491g/cm3
Critical pressure: 6.54MPa
Relative density (air =1):1.18
Two, the application of phosphane
It is used in the preparation of the organic compounds of the condensation catalyst, polymerization initiator, phosphorus, and the insecticide in the granary. Phosphane is important in the manufacture of semiconductor devices
N type doping source and phosphane are also used in polycrystalline silicon chemical vapor deposition, epitaxial material, ion injection technology, MO C V D process, phosphorous silica glass (PSG).
In the process of preparation of passivating film.
Five. Precautions
Store in a cool, ventilated storeroom. Stay away from fire and heat. The temperature of the storeroom should not exceed 50 centigrade; it should be stored separately with the inflammable and oxidizing agent.
Avoid mixed storage. The storage area should be equipped with leakage emergency treatment equipment. The operator must undergo special training and strictly abide by the operating rules. Do not burst, do not toss,
Do not impact, strictly prohibit open fire to bake gas cylinder, strictly prohibit barbaric loading and unloading. A steel bottle cylinder inspection time, does not meet the requirements of the cylinder should be entrusted to the special ferrill
The gas and other suppliers are inspected by the qualified pressure vessel inspection unit. The use of overdue steel bottles is strictly prohibited.
Six. Leakage of emergency treatment
Quickly evacuate the spill pollution area personnel first wind, and immediately isolated 450 meters, strictly restrict access. Cut off the fire source. Advice to emergency handling personnel Dai Zigei
A positive pressure respirator, wearing a antivirus suit. Cut off the leakage source as much as possible. Reasonable ventilation and accelerated diffusion. The spray water is diluted and dissolved. Construct a barrierpit to contain
A large amount of waste water produced. If possible, the air leaking air exhausting machine is sent to the open area or the appropriate sprinkler is installed to burn out. The gas leakage container should be properly treated, repaired and repaired.
Reuse after test.
Seven, first aid measures
Inhalation: quickly out of the scene to the fresh air. Keep the respiratory tract unobstructed. If breathing is difficult, give oxygen. If the breathing is stopped, the artificial call is made immediately.
Suction. Go to a doctor.
Fire extinguishing methods: Firefighters must wear a filter type respirator (full cover) or isolated respirator, wear a whole body fireproof and antivirus suit and put out a fire at the upper wind.
Cut off the gas source. If the gas source can not be cut off immediately, it is not allowed to extinguish the burning gas. Water spray cooling containers, if possible, move the container from the fire field to the open space.
Fire extinguishing agent: foggy water, foam, dry powder, carbon dioxide.