Definition of methane
1 Meaning of methaneMethane (from Greek methy wine, and the suffix - year) is a hydrocarbon alkane easier, whose chemical formula is CH4.
Each of the hydrogen atoms is attached to the carbon through a covalent bond. It is a non-polar substance that is presented in the form of gas at temperatures and pressures in ordinary. It is colorless and odorless and hardly soluble in water in its liquid phase.
In nature it occurs as the end product of the anaerobic decay of plants. This natural process can be used to produce biogas. Many anaerobic microorganisms generate it using CO2 as a final electron acceptor.
It is up to 97% of natural gas. In coal mines is called firedamp and is very dangerous since it is easily inflammable and explosive. However in recent decades have emphasized the commercial exploitation of methane gas from coal, as a source of energy.
Methane is a greenhouse gas relatively powerful contributing to the warming of the Earth since it has a global warming potential of of 23. This means that on an average of 100 years each kg of CH4 warms the Earth 23 times more than the same mass of CO2, however there are approximately 220 times more carbon dioxide in the Earth's atmosphere than methane by which methane contributes less significantly to the greenhouse effect.
Methane is the major component of natural gas, approximately 97% by volume at room temperature and standard pressure, so it follows that in condition standard of 0 ° C and one atmosphere of pressure has an ideal gas behavior and the volume is determined in function of the majority component of the mixture, which means that in a container of one cubic meter to 100% mix will be 0.97 cubic meters of natural gas; methane is a colorless and odorless gas. An odoriferous, usually metanotiol or ethanethiol is added as a security measure. Methane has a boiling point of - 161,5 ° C atmosphere and a melting point of - 183 ° C. As the gas is only flammable in a narrow range of concentration in air (5-15%). Liquid methane is not combustible.
Potential hazards on the health (Safety)Methane is not toxic. Its main health hazard is burns which may result if ignition. It is highly flammable and can form explosive mixtures with air. Methane reacts violently with oxidizers, halogens and some halogenated compounds. Methane is also suffocating and can displace the oxygen in an enclosed space. Asphyxia may ensue if the oxygen concentration falls below 19.5% by displacement. Concentrations which are explosive or flammable barriers are much smaller than the concentrations in which the risk of suffocation is significant. If there are structures built on or near landfills, methane released can penetrate into the interior of the buildings and expose occupants to significant levels of methane. Some buildings have systems under its foundations to capture this gas and expel it from the building. An example of this type of system is located in the Dakin building in Brisbane, California.
2. Definition of methaneThe methane was originally called swamp gas, because born in marshy lands and by decomposition of organic substances by the lack of oxygen in the air; It is a hydrocarbon, and within them, the simplest, composed of four molecules of hydrogen and carbon. It also is an alkane, there are multiple links between the carbon atoms. These links are directed at methane toward the vertices of a tetrahedron.
Methane, as a gas is easily to be transported by pipelines which can be networks so long that penetrate through continents, starting with the oil fields where originate to their destination. Methane combustion in utility is that it represents a great source of heat. Used as a fuel and is component of the gas city at 34%, and natural gas by more than 90%.
Like features, it is colorless, odorless and tasteless, also, is insoluble in water and their liquefaction is difficult to do.
Methane reacts with the following halogens: fluorine, chlorine and bromine, producing a mixture of halomethanes and a hydrogen halide. The mixture with the fluoride may cause a violent explosion. With chlorine and bromine is required initially to provide energy in the form of heat or light, and the reaction is less potent, especially in the case of bromine.
Frequent is occurring in coal mine explosions, when mixed with air in closed spaces, and gives rise to the "coalbed gas".
You can get industrial way from natural gas or by distilling coal (organic sedimentary rock) or (disintegration) cracking of petroleum.
It is harmful to the environment since it contributes to global warming.