The dehydration product of ch3ch2ch2oh in the presence of acid is propene. We can use sulfuric acid for the formation of propene.
Propanol can be dehydrated to produce propene by heating it at a temperature of around 170°C with an excess of strong sulfuric acid. In the initial stage, a hydrogen ion from the sulfuric acid is taken up by one of the oxygen's lone pairs of electrons. It is claimed that the alcohol has protonated.
The protonated propanol loses a water molecule in the second stage of the process, leaving a carbocation (formerly known as a carbonium ion)—an ion with a positive charge on a carbon atom. In the end, a double bond is created when a hydrogensulphate ion from the sulfuric acid removes a hydrogen ion from the carbocation.
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