Physicochemical properties and hazardous properties of oxygen

Oxygen o2 32.0 Qxygen , Compressed

Class 2.2 non-combustible gas, CNNO.22001, UNNO.1072.

Physicochemical properties: colorless, odorless combustion gas at room temperature. Condensed into a light blue liquid in liquid form. The relative density is 1.33, the melting point is -218.4 ° C, the boiling point is -183.0 ° C, the critical temperature is -118.6 ° C, the critical pressure is 5.11 × 106 Pa, the relative density of vapor is 1.05, and the chemical properties are active, which can form oxides with most elements. Mixed with combustible gas (such as hydrogen, acetylene, methane, etc.) can form an explosive mixture. After mixing with hydrogen, the combustion flame temperature reaches 2100-2500 ° C, slightly soluble in water.

Hazardous characteristics: Oxygen cylinders are exposed to sunlight or stored in a high temperature environment, or wrestling during handling. It is easy to vaporize and expand the liquefied oxygen in the cylinder, which may cause the cylinder to burst. Oxygen itself does not burn, but it can help combustion, and it can form an explosive mixture with organic matter or other easily oxidizable substances. If it comes into contact with oil, it will react to heat. When this heat accumulates to a certain extent, it can spontaneously ignite. Mixing with flammable gases such as oxygen and acetylene can form an explosive mixture. When liquid oxygen and combustibles are stored together, especially under high pressure, there is a risk of explosion. Liquid oxygen is easily absorbed by clothing, wood, paper, etc., and it burns when it is seen. Oxygen is non-corrosive, but it promotes corrosion of metals when moisture is present. The gas itself is non-toxic, and healthy people inhaled pure oxygen for 3 hours. It is generally considered that it has no effect, but if it is inhaled for a longer period of time or above 202.65-303.98kpa (2-3atm), continuous inhalation of high concentration oxygen may cause "oxygen poisoning". disease". When the skin is exposed to liquid oxygen, it can cause severe frostbite and cause tissue damage.

Identify the type of accident: fire, explosion, frostbite, oxygen poisoning.

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