nitrogen

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　　Item name: nitrogen Nitrogen

　　Molecular formula: N2

　　Properties: nitrogen is a colorless, odorless gas in general, and is usually non-toxic. Nitrogen accounts for 78.12% of the total volume of the air (volume fraction), and in the standard case the gas density is 1.25g/L, and nitrogen is insoluble in water. At ambient temperature and atmospheric pressure, only 0.02 volume of nitrogen is dissolved in the 1 volume water. Nitrogen is a difficult gas to liquefy. Nitrogen at very low temperatures will liquefy into colorless liquid, and further reduce the temperature will form more white crystalline solid. In the gas industry, usually with black seamless carbon steel containing nitrogen, according to purity is divided into pure nitrogen, Gao Chundan and ultra pure nitrogen, the use of large quantities, can choose liquid nitrogen dewar, liquid nitrogen tank, PSA nitrogen machine, membrane separation cryogenic nitrogen machine, nitrogen separation machine and nitrogen supply way.

　　Application of nitrogen:

　　Nitrogen gas is used as automobile tire filling gas

　　High purity nitrogen gas is used as the carrier gas of chromatograph and other instruments

　　Used as a bright annealing protective gas for copper tubes

　　Used in conjunction with high-purity helium and high-purity carbon dioxide as laser gas for laser cutting machines

　　Nitrogen is also used as a food preservative gas

　　Used for synthetic ammonia, synthetic fiber (nylon, acrylic fiber), synthetic resin, synthetic rubber, etc.

　　In the manufacture of automation systems, semiconductors, electronic components and other electronic industries, nitrogen is used as protection gas, dilution gas, and carrying gas

　　In the chemical industry, nitrogen is used mainly for the protection of gases, displacement gases, washing gases, and safety gases

　　For aluminum products, aluminum processing, aluminum thin rolling and other protective gases

　　Used as protection gas for reflow soldering and wave soldering to improve welding quality

　　Used as protective gas in float glass production, oxidation of tin bath

　　Matters needing attention：

　　Nitrogen is a colorless, tasteless, non-toxic, non burning high pressure gas stored in a gas cylinder.

　　Test and test the nitrogen pipe before use, avoid the leakage of nitrogen pipe, keep the operating environment ventilated. When the content of nitrogen in air increases, the oxygen content is less than 19.5%, it may cause suffocation.

　　Bottled nitrogen for high-pressure filling gas, use should be nitrogen pressure reducer, decompression, before use, when moving nitrogen cylinders should use cylinder trolley.

　　There are 5 years to be used for the nitrogen cylinder on the package, which must be inspected for 30 years. The expired gas cylinders must be sent to the Department for safety inspection before they can be continued.

　　Each bottle of nitrogen in the use of exhaust gas should be retained in the bottle remaining pressure at 0.5MPa, the minimum shall not be less than 0.25MPa residual pressure, should be closed bottle valve, in order to ensure the quality of gas and use safety.

　　Bottled nitrogen products in the transport storage and use should be strictly classified and piled up, combustible gas and combustion gas stacked together, not close to the fire and heat, should do not near the fire, not oily wax, not exposure, do not throw, do not hit, no arc or arc in the cylinder body, is strictly prohibited rough handling.

　　Liquid nitrogen temperature as low as -196 degrees, and skin contact can cause severe frostbite of the skin.

　　It may cause asphyxia when its content increases, resulting in an oxygen content below 19.5%.

　　Bottled nitrogen for high-pressure filling gas, use should be nitrogen pressure reducer, decompression, before use, when moving nitrogen cylinders should use cylinder trolley.

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