Propene
Propene
Propene
(propylene) may be prepared by heating propanol or isopropanol with sulphuric
acid (mechanism as for ethylene from ethanol) :
CH3CH2CH2OH -H2O CH3CH=CH2
CH3CH(OH)CH3 -H2O CH3CH=CH2
It may also
be prepared by heating propyl iodide with ethanolic potassium hydroxide :
CH3CH2CH2I +
KOH ethanol
CH3CH=CH2 + KI +H2O
Propane is
obtained commercially in huge quantities as a by-product in the cracking of
petroleum. It is a colourless gas, b.p. -48oC, insoluble in water
but fairly soluable in ethanol. It us used industrially for the preparation of
isopropanol, glycerol, polypropylene (a plastic) etc.
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