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Chlorine is used in thousands of commercial compounds used directly or indirectly in applications, 98% of the U.S. drinking water systems, 85% of pharmaceuticals and 96% of crop- protection chemicals. They are also widely used in plastics, disinfectants, paper manufacturing, bleach, wastewater treatment, food processing and many other industrial processes and chemicals.

Physical And Chemical Properties of Chlorine

Physical And Chemical Properties of Chlorine

Chlorine can be readily compressed into a clear, amber colored liquid which solidifies at atmospheric pressure at about -150°F. Chlorine gas forms into a soft ice upon contact with moisture at 49.3°F and at atmospheric pressure. The liquid is about two and a half times heavier than air. The liquid vaporizes readily at normal atmospheric temperature and pressure.

In its elemental form, chlorine is a greenish yellow gas with an unmistakable irritating, penetrating and pungent odor. It is very unstable and highly reactive which can quickly react with other substances to form other chemicals. Chlorine gas or liquid is neither explosive nor flammable.

Properties of Chlorine Gas

Symbol Cl2
Atomic Number 17
Atomic Wt. 35.457
Isotopes 33, 34, 35, 36, 37, 38, 39
Density at 32°F and 1 atm 0.2006 lb/ft3
Liquefying Point at 1 atm -30.1°F (-34.5°C)
Viscosity at 68°F 0.01325 centipoise (approximately the same as saturated steam between 1 and 10 atm)
Specific Heat at Constant Volume at 1 atm Pressure and 59°F 0.085 Btu/lb/°F
Thermal Conductivity at 32°F 0.0042 Btu/lb./ft2/°F/ft
Heat of Reaction with NaOH 626 Btu/lb Cl2 gas
Solubility in Water at 68°F 60.84 lbs/1000 gal.
Critical Temperature 291.2°F (144°C)
Critical Pressure 1118.36 psia
Critical Density 573 g/l; 35.77 lbs/ft3
Compressibility 0.0118% per unit vol per atm increase at 68°F
Density at 32°F 91.67 lbs/ft3
Specific Gravity at 68°F 1.41 (water = 1)
Boiling Point (Liquefaction Point) 1 atm – 34.5°C; -149.76°F
Freezing Point -100.98°C; -149.76°F
Viscosity at 68°F 0.342 centipoise
1 Volume Liquid at 32°F and 1 atm 248.6 Vol gas
1 lb Liquid at 32°F and 1 atm 4.98 ft3 gas
Specific Heat 0.226 Btu/lb/°F
Latent Heat of Vaporization 123.8 Btu/lb at -29.3°F
Heat of Fusion 41.2 Btu/lb at -150.7°F
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