PHOSPHORUS
TRICHLORIDE
|
PRODUCT
IDENTIFICATION
|
CAS
NO. |
7719-12-2
|
|
EINECS
NO. |
231-749-3 |
FORMULA |
PCl3 |
MOL
WT. |
137.33 |
H.S.CODE
|
2812.10 |
TOXICITY |
Oral rat LD50: 18 mg/kg |
SYNONYMS |
phosphorus(III) chloride;
Chloride of phosphorus; PICl; |
Phosphorus chloride;
Fosforo(tricloruro di) (Italian); Fosfortrichloride (Dutch);
Phosphore(Trichlorure De); (French); Phosphorous Trichloride;
Phosphortrichlorid (German); Trichlorophosphine; Trojchlorek Fosforu
(Polish); |
SMILES |
phosphorus with chlorine |
CLASSIFICATION
|
|
PHYSICAL AND CHEMICAL PROPERTIES
|
PHYSICAL
STATE |
clear
liquid |
MELTING POINT |
-112
C |
BOILING
POINT |
76
C |
SPECIFIC GRAVITY |
1.574 |
SOLUBILITY
IN WATER |
Decomposes
exothermically |
pH |
|
VISCOSITY |
|
VAPOR DENSITY |
4.75 |
AUTOIGNITION
|
|
NFPA
RATINGS
|
Health: 3 Flammability: 0 Reactivity: 2 Other: water
reactive |
REFRACTIVE
INDEX
|
1.5148 |
FLASH
POINT |
none |
STABILITY |
Stable under ordinary conditions |
GENERAL
DESCRIPTION & APPLICATIONS
|
Phosphorus Trichloride [Phosphorus(III) Chloride] is a clear to slightly
yellow oily liquid that fumes in moist air; specific gravity 1.57; melting
at -112 C; boiling at 75.5 C. It is soluble in benzene, ether, carbon disulphide
and in carbon tetrachloride. It violently reacts with water to form phosphonic acid and hydrochloric acid.
It is prepared by direct union of excess phosphorus with chlorine. (excess chlorine contaminates the product with
phosphorus(V) chloride). The crude
is then purified by distillation. Phosphorus(III) chloride is used to convert into
phosphorus oxychloride. It reacts exothermically
with alcohols (and phenol) to produce phosphite esters. It is used as an starting material for the synthesis of
a variety of inorganic and organic phosphorus compounds used as
pesticides, water treatment chemicals, flame retardants, phosphite
antioxidants, plasticizers and stabilizers for plastic and elastomers, lube oil and paint
additives.
Phosphorus Pentachloride [phosphorus(V) chloride] is a pale
yellow solid that fumes in moist air; specific gravity 1.60; melting
at 148 C under pressure; boiling at 160 C (sublimes). It is soluble in benzene, ether, carbon disulphide
and in carbon tetrachloride. It is Nonflammable nor explosive. It is
hydrolysed violently with water to form phosphonic acid, phosphorus oxychloride,
and hydrochloric acid.
It is prepared by direct union of phosphorus with excess chlorine. (excess phosphoru contaminates the product with
phosphorus(III) chloride). Phosphorus(V) chloride is used to chlorinating agent and dehydrating agent for the synthesis of
a variety of inorganic and organic phosphorus derivatives used as
pesticides, water treatment chemicals, flame retardants, phosphite
antioxidants, plasticizers and stabilizers for plastic and elastomers, lube oil and paint
additives. It
is also used as a catalyst in cyclization reaction. It is used to improve grain
structure in metal casting.
Phosphoryl chloride, also called phosphorus oxychloride, contains the strong P=O
solid bond. Phosphorus oxychloride is a colourless volatile liquid with a pungent odour;
specific gravity 1.67; melting at 2 C; boiling at 105 C. The liquid reacts with
water violently to produce hydrochloric and phosphoric acid. It reacts
exothermically with alcohols and/or phenols to produce phosphate esters.
Phosphorus oxychloride is produced by oxidizing phosphorus trichloride or by
reacting phosphorus pentachloride with phosphorus pentoxide. It has a distorted
tetrahedral shape and can act as a donor towards metal ions to give rise to a
series of complexes. It is used in the manufacture of phosphate esters widely
used in plasticizers, hydraulic fluids, lube oil additives, pesticides, and
flame retardants. Triarylphosphate esters such as triphenyl phosphate and
tricresyl phosphate are esters converted from phosphorus oxychloride. These
esters are used as flame retardants and plasticisers.
Tributyl phosphate ester is used as a liquid-liquid
extraction solvent. Phosphorus oxychloride is used as a catalyst and chlorinating agent in
the synthesis of target molecules. |
SALES
SPECIFICATION |
APPEARANCE
|
Clear
liquid |
ASSAY |
98.0%
min
|
DISTILLATION
RANGE
|
90%
( 74.5 - 79 C)
|
IRON |
5ppm
max
|
LEAD |
5ppm
max
|
TRANSPORTATION
|
PACKING |
35kgs
in drum , 300kgs in drum
|
HAZARD CLASS |
6.1
(Packing group: I) |
UN
NO. |
1809 |
OTHER
INFORMATION |
European Hazard
Symbols: T+ C, Risk Phrases: 14-26/28-29-35-48/20, Safety Phrases: 26-36/37/39-45-7/8 |
DESCRIPTION
OF PHOSPHORUS
|
Phosphorus is a nonmetallic chemical element in group 15 (nitrogen family,
formerly Va) of periodic table; atomic number 15 atomic mass 30.9738; melting
point ca 44.1 C (white); boiling point ca 280 C (white); specific gravity 1.82
(white), 2.34 (red), 2.70 (black); valence -3, +3, or +5 ; electronic config.
2-8-5 or 1s 22s 22p 63s 23p 3. The phosphorus molecule is composed of four
phosphorus atoms, P4. Phosphorus exists in a number of allotropic forms [white
(alpha and beta), red, black and/or violet] in the same physical state. White
phosphorus is a white to yellow waxy substance which ignites spontaneously in
air to form white fumes of phosphorus pentoxide and glows without emitting heat.
Phosphorus is stored underwater as it is extremely poisonous, insoluble in water
(but soluble in carbon disulfide). Commercial production of elemental phosphorus
is prepared from phosphorite or phosphate rock (apatite, an impure calcium
phosphate mineral) reacting with coke and sand or silica pebbles or at high
temperatures in an electric furnace. Calcium silicate is produced as a
by-product. White phosphorus is used as a deoxidizing agent in the preparation
of steel and phosphor bronze. It is also used in rat poisons and to make smoke
screens (by burning) for warfare. When white phosphorus is heated to about 250 C
with air absence, it changes into the red phosphorus. Red phosphorus, a dark
reddish powder or crystal, does not ignite spontaneously unless heated to 200 C,
does not phosphoresce and it is a little less dangerous than white phosphorus.
It is used to make matches. Red phosphorus is prepared commercially by heating
calcium phosphate with sand and coke in an electric furnace. Black allotrope is
obtained industrially by heating at 300 C under pressure with a mercury
catalyst. It has a layer structure and is stable. The major use of phosphorus
compounds is in fertilizers, mainly as a mixture called superphosphate (calcium
hydrogen phosphate), obtained from phosphate minerals by sulfuric acid
treatment; and in nitrophosphates. Phosphorus is burned to make phosphorus
pentoxide [phosphorus(V) oxide], a white solid used as a chlorinating agent in
organic chemistry, as a drying agent and mainly converted to phosphoric acid
used to make phosphates for fertilizers, electro chemical polishing and shaping,
electroplating, metal cleaning and pickling in metal treatment by reaction with
water. Phosphorus is highly reactive. A wide range of compounds is formed for
uses in detergents, water softeners, pharmaceuticals, dentifrices, and in many
other important applications. It forms metal phosphides and covalently bonded
phosphorus(III) and phosphorus(V) compounds. Phosphoric acid can combine with
certain alkaline elements to form salts called phosphates. |
|