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Liquid carbon dioxide

  

Description
Carbon dioxide is a compound containing carbon and oxygen. At atmospheric temperatures and pressures, carbon dioxide is in gaseous form. It is colorless, odorless, about 1.5 times heavier than air and a slightly acid gas. The gas is nonreactive, nontoxic and nonflammable. Solid carbon dioxide (dry ice ) is formed at a temperature of -78.5℃.



Applications
1- Carbon dioxide is used on a large scale as a shield gas in welding, where the gas protects the weld puddle against oxidation by the surrounding air.
2- Used in the manufacture of casting molds to enhance their hardness.



PHYSICAL AND CHEMICAL PROPERTIES
Appearance : Liquefied gas. Colorless. Odor : No odor warning properties. Odor threshold : No data available. pH : Not applicable. Melting point/range : -70 °F (-56.6 °C) Boiling point/range : -109 °F (-78.5 °C) Flash point : Not applicable. Evaporation rate : Not applicable. Upper/lower explosion/flammability limit : No data available. Vapor pressure : 831.04 psia (57.30 bara) at 68 °F (20 °C) Carbon dioxide (Refrigerated) Water solubility : 2.000 g/l Relative vapor density : 1.52 (air = 1) Relative density : 1.03 (water = 1) Partition coefficient (noctanol/water) : Not applicable. Auto-ignition temperature : No data available. Decomposition temperature : No data available. Viscosity : Not applicable. Molecular Weight: 44 g/mol.



Hazards & Transportation
Hazard Statements
Carbon dioxide (Refrigerated)
H281: Contains refrigerated gas; may cause cryogenic burns or injury. May displace oxygen and cause rapid suffocation. May increase respiration and heartrate.
Major Hazard: high temperature and inhalation
Toxicity: low toxicity, T.L.V of 5000 ppm
Fire Potential: nonflammable
Odour: none
Metabolic Abnormalities Disturbance of central nerves system. Unconsciousness may occur at concentration higher than 10%
DOTE Name: Carbon dioxide
DOT Label: nonflammable gas
Identification No.: UN-1013 (compressed gas)
                                UN-2187 (refrigerated liquid)
Hazard Class/Division: 2.2

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