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Question

Which process is used to prepare oil gas from kerosene oil and petrol gas from petrol?

A
Isomerisation
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B
Aromatization
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C
Pyrolysis
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D
Controlled oxidation
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Solution

The correct option is C Pyrolysis
Preparation of oil gas from kerosene oil and petrol gas from petrol is based on the process of Pyrolysis.

Pyrolysis is described as converting the compound into smaller fragments in the absence of air with the application of heat, and it varies from combustion. It happens in the absence of air, and thus oxidation of compounds does not occur. In general, the Pyrolysis of alkanes is also named cracking.

Pyrolysis of higher alkanes to produce a mixture of lower alkanes, alkenes are referred to as cracking. Usually, it is carried out by heating the higher alkanes to high temperatures under pressure ranging from 6-7 atm, either in the presence or absence of a catalyst.


for example- Dodecane, a constituent of kerosene oil on heating to 973K in presence of Pt/Pd/Ni gives a mixture of heptane and pentene along with other products.
C12H26971 K−−−−−Pt/Pd/NiC7H16+C5H10+other products


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