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High purity gases

Current Position:Product > High purity gases

Name: CH4
Classification: High purity gases
Applicable way:




Methane Product Description
Methane is a colorless, odorless, flammable gas, suffocating odor. High pressure compressed gas cylinders loaded. Solubility: soluble in water, soluble in alcohol, ether. , Density (standard conditions) 0.717 g / liter, the boiling point of -161.5 ℃, m.p. -182.48 ℃. Heat of combustion (kJ / mol): 889.5, critical temperature (℃): - 82.6, critical pressure (MPa): 4.59. Flash point (℃): - 188, ignition temperature (℃): 538. Under certain conditions, can occur methane halogenation reaction (Cl2, Br2) and thermal decomposition (decomposition into C, H2, C2H2, etc.) and other reactions. Bluish flame was burning methane. The main component of biogas, pit gas, natural gas is methane. Methane gas and pressurized liquefied by low temperature, you can use a special transport ship across the ocean. Methane stable chemical properties of methane, with the acidic KMnO4 solution or bromine react not occur. Ignition of methane and air mixture can explode. Methane explosion limit in air is 5.3 to 14.0% (by volume), the explosion limit oxygen in the (volume) of 5.4 to 59.2 percent.

Methane application
Methane is used as water heater, gas stove calorific value of the fuel test standard
Standards for the production of methane gas combustible gas alarm and calibration gas
Methane as a solar cell, an amorphous silicon film chemical vapor deposition of carbon source
Methane is used as medicine and chemical synthesis of raw materials

Methane itself is toxic to the human body has no special effect, but there narcotic effects in high concentrations. When the air content is large, it can cause hypoxia, asphyxia, causing symptoms of poisoning. Produce eye and forehead pressure sensation when the methane concentration is greater than 10%, at higher concentrations, began to shortness of breath, fatigue, nausea, vomiting and other symptoms of suffocation, and can lead to loss of consciousness. When gas leakage, use forced ventilation method to a concentration below the explosive range. If you can not plugging cylinder leak, will have to move to an open area to put the house, or install the appropriate lamp burning. Bottled gas products for high-pressure filling gas, should be used by decompression buck before use. Life on the packaging of cylinders are used, where the expired gas cylinders must be taken to have a safety inspection department before they can continue to use. Bottle when using the exhaust gas, and pressure in the bottle should be kept 0.5MPa, more than the minimum of not less than 0.25MPa pressure cylinder valve should be closed to ensure the gas quality and safe to use. Bottled gas products in the transport and storage, the use of classification should be stacked, non-combustible gas and combustion gas stacked together, are not allowed near open flames and heat sources, do not get near the fire should be, not contaminated with oil wax, not prolonged sun exposure, not weight throw Do not hit, were prohibited in the cylinder body arc or arc, rough handling is strictly prohibited.
The physical properties of methane

Molecular formula: CH4
Relative molecular mass of 16.043
Melting 90.67K, -182.48 ℃, - 296.46oF
Boiling point, 101.325 kPa (1atm) when 111.66K, - 161.49 ℃, -258.68oF
Critical temperature 190.58K, -82.57 ℃, -116.63oF
Critical pressure 46.0mPa, 46.04bar, 45.44atm, 667.75psia
Critical volume 99.3cm3 / mol
Critical density 0.1616g / cm3
Critical compression coefficient 0.288
Eccentric factor 0.011
Engraved liquid density, -110 ℃ when 0.331g / cm3
Liquid thermal expansion coefficient, -110 ℃ when 0.010735 1 / ℃
Surface tension, -182 ℃ when 35.68 × 10-3 N / m, 35.68dyn / cm
Gas density, 101.325 kPa (atm) and 70 oF (21.1 ℃) when 0.664kg / m3, 0.0 415lb / ft3
Gas relative density, 101.325 kPa (1atm) and 70oF time (air = 1) 0.554
Heat of vaporization, boiling point 508.63kj / kg, 218.71BTU / 1b
Heat of fusion, melting point 58.65kj / kg, 25.22BTU / 1b
Gas specific heat capacity cp, 25 ℃ when 2.265kj / (kg ? k), 0.541BTU / (1b · R)
Gas constant volume specific heat capacity cp, 25 ℃ when 1.747kj / (kg ? k), 0.418BTU / (1b · R)
Gas specific heat ratio, cp / cv 1.297
Liquid specific heat capacity, -123 ℃ when 4.022kj / (kg ? k), 0.961BTU / (1b · R)
Due to body heat capacity, -203 ℃ when 2.448kj / (kg ? k), 0.585BTU / (1b · R)
Gas molar entropy, 25 ℃ when 186.27j / (mol ? k)
Gas molar entropy generation, 25 ℃ when -80.53j / (mol ? k)
Molar enthalpy of formation of gas, 25 ℃ when -74.85kj / mol
Gas molar Gibbs energy, 25 ℃ when -50.84kj / mol
Solubility parameter 11.618j / cm3) 0.5
Liquid molar volume 37.832cm3 / mol
Solubility in water, 25 ℃ when 24.4 × 10-6 (ω)
Octanol - water partition coefficient, lgKow 1.09
Henry's law constant in water, 25 ℃ when 3582.4MPa / x, 35356atm / (x)
Gas viscosity, 25 ℃ when 110.72 × 10-7 Pa ? s, 110.72μP
Liquid viscosity, -100 ℃ when 0.034mPa ? s, 0.034cp
Gas thermal conductivity, 25 ℃ when 0.03542W / (m ? k)
Liquid thermal conductivity, -100 ℃ when 0.1494 W / (m ? k)
Lower explosive limit of the air content 5% (φ)
High air explosion limit content 15% (φ)
Flash point -187.8 ℃ -306 ℉
Ignition point 600 ℃, 1112 ℉
Heat of combustion, 25 ℃ (77oF) gaseous 50009kj / kg, 321504BTU / 1b
Oxygen minimum ignition (101.325kPa): 555 ℃