75-44-5 - ChemicalBook India

CHEMICAL AND PHYSICAL PROPERTIES

Physical Description	Phosgene appears as a colorless gas or very low-boiling, volatile liquid with an odor of new-mown hay or green corn. Extremely toxic. Warning properties of the gas inhaled are slight, death may occur within 36 hours (Lewis, 3rd ed., 1993, p. 1027). Prolonged exposure of the containers to intense heat may result in their violent rupturing and rocketing. Rate of onset: Immediate & Delayed (Lungs) Persistence: Minutes - hours Odor threshold: 0.5 ppm Source/use/other hazard: Dye, pesticide, and other industries; history as war gas, corrosive/irritating.
Color/Form	Colorless gas [Note: A fuming liquid below 47 degrees F. Shipped as a liquefied compressed gas].
Odor	Suffocating odor; when diluted with air there is an odor reminiscent of moldy hay
Boiling Point	47 °F at 760 mmHg (EPA, 1998)
Melting Point	-180 °F (EPA, 1998)
Solubility	Very slightly soluble (NTP, 1992)
Density	1.432 at 32 °F (EPA, 1998) - Denser than water; will sink
Vapor Density	3.4 (EPA, 1998) - Heavier than air; will sink (Relative to Air)
Vapor Pressure	1215 mmHg at 68 °F (EPA, 1998)
Henry's Law Constant	Henry's Law constant = 1.7X10-2 atm-cu m/mole at 24.85 °C; 6.6X10-3 atm-cu m/mole at 4.85 °C
Autoignition Temperature	Not flammable (USCG, 1999)
Decomposition	... When heated to decomposition ... it will react to produce toxic and corrosive fumes of /carbon monoxide/ and /hydrogen chlorides/.
Viscosity	6.8488X10-4 Pa.s at 263.15 K
Corrosivity	Phosgene used in anhydrous equipment with reagents is not corrosive to ordinary metals. In presence of moisture, corrosive conditions will develop rapidly, in which case monel, tantalum, or glass lined equipment may be used.
Heat of Vaporization	3.0783X10+7 J/kmol at 145.37 K
Surface Tension	34.6 mN/m at 0 °C; 20.1 mN/m at 16.7 °C; 17.6 mN/m at 34.5 °C; 15.9 mN/m at 46.1 °C.
Ionization Potential	11.55 eV
Odor Threshold	Odor Threshold Low: 0.12 [ppm] Odor Threshold High: 5.7 [ppm] Odor threshold from AIHA
Refractive Index	Index of Refraction: 1.3561
Kovats Retention Index	416
Other Experimental Properties	PHOSGENE GAS LIQUIFIES @ 8 °C
Chemical Classes	Toxic Gases & Vapors -> Acid Halides

COMPUTED DESCRIPTORS

Molecular Weight	98.91 g/mol
XLogP3	1.8
Hydrogen Bond Donor Count	0
Hydrogen Bond Acceptor Count	1
Rotatable Bond Count	0
Exact Mass	97.9326200 g/mol
Monoisotopic Mass	97.9326200 g/mol
Topological Polar Surface Area	17.1 Å²
Heavy Atom Count	4
Formal Charge	0
Complexity	29
Isotope Atom Count	0
Defined Atom Stereocenter Count	0
Undefined Atom Stereocenter Count	0
Defined Bond Stereocenter Count	0
Undefined Bond Stereocenter Count	0
Covalently-Bonded Unit Count	1
Compound Is Canonicalized	Yes

PRODUCT INTRODUCTION

description

Phosgene is a colorless nonflammable gas that has the odor of freshly cut hay. It is a manufactured chemical, but small amounts occur naturally from the break down of chlorinated compounds. Phosgene is used in the manufacture of other chemicals such as dyestuffs, isocyanates, polycarbonates and acid chlorides; it is also used in the manufacture of pesticides and pharmaceuticals. Phosgene can also be used to separate ores. Phosgene is a gas at room temperature, but is sometimes stored as a liquid under pressure or refrigeration.

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