Both ethanol and ethane has two carbon atoms and ethnol can be converted to ethane through preparing ethene or grignard reagent. Ethanol is a liquid compound in room temperature and ethane is a gas in room temperature.
Ethanol - CH3CH2OH - an alcohol compound
Ethane - CH3CH3 - an alkane compound
Ethanol to ethane is done by two ways in this tutorial.
First we discuss ethanol to ethane by preparing bromoethane, and grignardd reagent.
Add PBr3 to ethanol. That will give bromoethane. Also HBr can be used to prepare bromoethane. HBr reacts with ethanol to give bromoethane.
Add Mg and dry ether to bromoethane. ethyl magnesium bromide(CH3CH2MgBr) is formed.
Grignard reagent and water reaction will give ethane.
In this method, we prepare ethene from ethanol. Then ethane is prepared by ethene.
Ethene is prepared by adding concentrated sulfuric acid to ethanol and heating the mixture. Other dehydrators such as Al2O3, P2O5, H3PO4 are also can be used insted of concentrated sulfuric acid to prepare ethene from ethanol. Ethene (CH2-CH2) is an alkene compound which has two carbon atoms.
Then prepared ethene and H2 with in the presence of Pt catalytic are reacted. That will give ethane as the product.
We can convert alcohol to aldehyde. Then aldehyde is converted to alkane.
Ethanol reacts with PCC to give ethanl. Ethanal is an aldehyde compound. ( ethanal - CH3CHO ). PCC is pyridinium chlorochromate which is used to oxidize alcohols to aldehydes.
Ethanal is reduced to ethane by clemmensen reduction. Zn(Hg) and concentrated HCl is used as clemmensen reagent. Aldehydes and ketones are reduced to hydrocarbons by clemmensen reduction reaction.Clemmensen reduction reaction
Ethanol is a liquid in room temperature. But ethane( an alkane compound) is a gas at room temperature. Ethanol reacts with Na and emits H2 gas and ethane does not.
Ethanol is a liquid in room temperture. But ethane is a gas. So there is a phase change, liquid to gas in ethanol to ethane.
Ethene is prepared from ethanol from one step. Ethanol is heated with concentrated sulfuric acid to prepare ethene. As sulfuric acid, another dehydrators can be used.
Alcohols are more reactive than alkanes. Therefore ethanol is more reactive than ethane.
Ethane is an alkane compound which are very inactive. If we can convert ethane to bromoethane by brominization under sun light, we can prepare ethanol. Bromethane reacts with dilute NaOH to give ethanol.
Bromethane is heated with alcoholic KOH to prepare ethene.
Ethanal is reduced to ethanol by LiAlH4. Then ethanol is dehydrated from acidic concentrated sulfuric acid to prpare ethene.
We know alkanes are not reactive like alcohols. So it is not easy to convert ethane to ethanol like ethanol to ethane. If we make chlorooethane from ethane we can make ethanol. We can prepare chloroethane as one product from alkane chlorination reaction. But this is not a good way because it is a mixture of many compounds and we have to separate chloroethane from that mixture.