methane

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　　Item name: methane methane

　　Chemical formula: CH4

　　Properties: methane is colorless, odorless, flammable gas, suffocating odor. Cylinders are packed with compressed compressed gas. Solubility: slightly soluble in water, soluble in alcohol, ether. Density (standard condition) 0.717 g / L, boiling point -161.5 DEG C, melting point -182.48 DEG C. Combustion heat (kJ/mol):889.5, critical temperature (DEG C):-82.6, critical pressure (MPa):4.59. Flash point (DEG C):-188, ignition temperature (DEG C):538. Under certain conditions, methane can undergo halogen reactions (Cl2, Br2) and thermal decomposition (decomposition into C, H2, C2H2, etc.) reactions. When the methane burns, the flame is bluish white. Methane, pit gas and natural gas are the main components of methane. The methane in natural gas is liquefied at low temperature and pressure and can be transported by special vessels. The chemical properties of methane stability of methane, with acidic KMnO4 solution or not react with bromine. A mixture of methane and air will explode. The explosive limit of methane in the air is 5.3 to 14% (volume), and the explosion limit in oxygen is 5.4 to 59.2% (volume).

　　Application:

　　Methane is used as standard fuel for water heaters and gas stoves.

　　Standard gas of methane for producing combustible gas alarm.

　　Methane is used as a carbon source for solar cells and amorphous silicon films for vapor phase chemical deposition.

　　Methane is used as a raw material for the synthesis of pharmaceuticals and chemicals.

　　Matters needing attention：

　　Methane itself has no special toxic effects on humans, but only when the concentration is high. When the content of the air is large, it can also cause hypoxia, asphyxia and toxic symptoms. When the concentration of methane is greater than 10%, there is a feeling of pressure on the eyes and forehead. When the concentration is higher, respiratory symptoms such as shortness of breath, fatigue, nausea and vomiting begin to occur and can cause unconsciousness. When venting the gas, use forced ventilation to keep the concentration below the explosion range. If the leak of the cylinder can not leak, it should be transferred to the open place, house, or install the appropriate burner. Bottled gas products for high-pressure filling gas, when used, should be decompression, decompression before use. The gas cylinders on the package are available for use, and the expired cylinders must be sent to the Department for safety inspection before they can be continued. Each bottle of gas in use to 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 gas quality and safety. Bottled gas products in the transport storage and use should be put in non 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.

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