Phosphorus pentachloride

  • Phosphoric chloride
  • Phosphorus perchloride
Formula
PCl5
Structure
Description
White to pale yellow crystalline mass. Pungent, unpleasant odor.
Uses
Chemical intermediate (chlorinating agent) for alkyl chlorides, acyl chlorides, sulfonyl chlorides, & gem-dihalo compound (from ketones), catalyst in manufacture of acetylcellulose & benzotrichloride from benzal chloride, dehydrating agent.

Registry Numbers and Inventories.
CAS
10026-13-8
EC (EINECS/ELINCS)
233-060-3
EC Index Number
015-008-00-X
EC Class
Reacts violently with water; Contact with water liberates toxic gas; Very toxic; Harmful; Corrosive
R 14 22 26 34 48/20
S 7/8 26 36/37/39 45
RTECS
TB6125000
RTECS class
Other
UN (DOT)
1806
Merck
12,7508
Beilstein/Gmelin
2622 (G)
Swiss Giftliste 1
G-2743
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
Cl5P
Formula mass
208.24
Melting point, °C
148
Sublimation point, °C
160
Vapor density (air=1)
7.2
Critical temperature
372
Density
3.60 g/cm3 (20 C)
Solubility in water
Reacts
Surface tension
20.9 erg/cm2 (170)
Dielectric constant
4.23 (23 C)
Heat of fusion
41.9 kJ/mol

Hazards and Protection.
Storage
Store in a cool, dry, well-ventilated area away from incompatible substances. Corrosives area. Keep containers tightly closed.
Handling
Wash thoroughly after handling. Wash hands before eating. Minimize dust generation and accumulation. Follow all MSDS and label precautions even after container is emptied because they may contain product residues. Do not get in eyes, on skin, or on clothing. Keep container tightly closed. Do not ingest or inhale. Do not allow contact with water.
Protection
Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
Respirators
A respiratory protection program that meets OSHA's 29 CFR 1910.134 and ANSI Z88.2 requirements or European Standard EN 149 must be followed whenever workplace conditions warrant a respirator's use.
Small spills/leaks
Vacuum or sweep up material and place into a suitable disposal container. Avoid runoff into storm sewers and ditches which lead to waterways. Clean up spills immediately, using the appropriate protective equipment. Provide ventilation.
Disposal code
24
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Reacts violently with water. Alcohols, amines, aluminum, sodium, potassium acids.
Decomposition
Hydrogen chloride, oxides of phosphorus, irritating and toxic fumes and gases, phosphorous fumes.

Fire.
Autoignition, °C
Noncombustible
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Water Reactive. Material will react with water and may release a flammable and/or toxic gas. Use extinguishing media appropriate to the surrounding fire. Substance is noncombustible. Contact with water can cause violent liberation of heat and splattering of the material. Extinguishing media: Do NOT use water directly on fire. Substance is noncombustible; use agent most appropriate to extinguish surrounding fire. If water is the only media available, use in flooding amounts. Use carbon dioxide or dry chemical.
Fire potential
Moderate fire hazard, by chemical reaction. Reacts violently with moisture.
Hazards
When heated to decomposition, it emits highly toxic fumes of chlorides and chlorine. Will react with water or steam to produce heat and toxic and corrosive fumes. Reacts violently with moisture, chlorine trioxide, fluorine hydroxylamine, magnesium oxides, diphosphorus trioxide, sodium and potassium. Decomposed by water to form hydrogen chloride, phosphoric acids, corrosive materials, and heat. This heat may be sufficient to ignite surrounding combustible materials. Incompatible with water, magnesium oxide, chemically active metals: sodium, potassium; alkalis; aluminum; chlorine dioxide; chlorine; diphosphorus trioxide; fluorine; hydroxylamine; magnesium oxide; 3'-methyl-2-nitrobenzanilide; nitrobenzene; sodium; urea; water.
Combustion products
Fire will produce irritating, corrosive and/or toxic gases. Reaction with water may generate much heat which will increase the concentration of fumes in the air.
Health
3
 
Flammability
0
 
 
Reactivity
2
 
 
Special
W

Health.
Exposure limit(s)
TLV (as TWA): 0.1 ppm; 0.85 mg/m3 (ACGIH 1996). OSHA PEL: TWA 1 mg/m3 NIOSH REL: TWA 1 mg/m3 NIOSH IDLH: 70 mg/m3
Poison_Class
1
Exposure effects
Headache, weakness, and dizziness may occur.
   Ingestion
Causes digestive tract burns with immediate pain, swelling of the throat, convulsions, and possible coma. May be harmful if swallowed.
   Inhalation
May cause severe irritation of the respiratory tract with sore throat, coughing, shortness of breath and delayed lung edema. Causes chemical burns to the respiratory tract.
   Skin
Causes skin burns.
   Eyes
Causes severe eye burns.

First aid
 
   Ingestion
Do NOT induce vomiting. If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Get medical aid immediately. Call a poison control center.
   Inhalation
Get medical aid immediately. Remove from exposure to fresh air immediately. If breathing is difficult, give oxygen. DO NOT use mouth-to-mouth respiration. If breathing has ceased apply artificial respiration using oxygen and a suitable mechanical device such as a bag and a mask.
   Skin
Get medical aid immediately. Immediately flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse. Destroy contaminated shoes.
   Eyes
Get medical aid immediately. Do NOT allow victim to rub or keep eyes closed. Extensive irrigation is required (at least 30 minutes).

Transport.
UN number
1806
Response guide
Hazard class
8
PRTC
T
Packing Group
II
 
USCG CHRIS Code
PPC
 
HS Code
2812 10 16
 
Std. Transport #
4932323