From methane can get a number of complex organic compounds.He is a colorless gas having no taste and odor, practically insoluble in water, and having a lower density than air.He is one of the most common gases on Earth and other planets of the solar system.At temperatures above 1000 ° C, methane decomposes to carbon and hydrogen: CH4 → C + 2H2.Etot process called cracking methane .When cracking the other hydrocarbons - ethane - ethylene obtained .Therefore, to obtain an ethylene and originally from methane receive ethane then ethane is cracked.
With Wurtz reaction can be obtained from compounds methane ethane, and then begin the process of cracking, resulting in turn ethylene .This reaction is that by methyl iodide is ad
ded sodium metal, resulting in an ethane: CH3-Y + [Na] + CH3-Y → C2H6Zatem reaction is carried out cracking of ethane: C2H6 → CH2 = CH2 + CH4 + H2 (at t =500 ° C)
There is a more modern and simple way of getting ethylene and methane from .In this case, the reaction is usually carried out at a temperature 500-900oS in the presence of oxygen and oxides of manganese, cadmium.The gases are then separated by absorption, distillation and deep cooling under pressure.Equation obtain ethylene and methane from as follows: 2CH4 → C2H4 + H2
second method because of its simplicity, is used more often.From ethylene and, in turn, receive other organic materials including poly ethylene, acetic acid, ethyl alcohol, vinyl acetate and styrene.In the past it has also been used in medicine for anesthesia.Furthermore, ethylene used to regulate plant growth and ripening.Also, it is made of synthetic lubricating oils that are used in industry and households.
Tip 2: How to obtain ethylene
Ethylene - it is a combustible gas, it has a mild odor. Ethylene is used in the production of hydrolytic ethanol, ethylene glycol (antifreeze main part), styrene, polyethylene, and more.Receive it by pyrolysis (heating without air access), petroleum fractions such as straight-run gasoline, etc.However, there are methods for producing ethylene without the use of petroleum products.
- Ethyl alcohol, aluminum oxide, sulfuric acid, glassware.
The capacity of the heat-resistant material put some alumina and close the cover with two gas output tubes, one of which was put into a test tube with concentrated sulfuric acid.Heat the vessel to the gas burner, the temperature of the alumina should be from about 350 to 500 degrees.
Further, in a separate tube, pour a little pure ethanol.Close the vial stopper with a gas outlet tube and heat it on the alcohol burner.The venting tube connected to the reservoir, which is alumina.When heated, the alcohol starts to evaporate, passing through the gas outlet, falls into a container of aluminum oxide, and at a high temperature on alumina will be dehydration, ie,elimination of water from the molecules of alcohol.From the tank will yield of ethylene with steam and unreacted alcohol in gaseous state.The mixture falls into the tube with sulfuric acid, which serves for dewatering the mixture.
Mix ethanol and concentrated sulfuric acid.Reaction occurs to form acid ethyl ester.Heat the mixture under heating dehydration process occurs with the release of alcohol ethylene.
When working with acids, use means of protection, protect your eyes and skin.Observe the fire safety measures.