Question

The temperature range during which petrol (gasoline) is obtained:

• A. ${40}^{o}C$ to ${200}^{o}C$
  
• B. ${40}^{o}C$ to ${80}^{o}C$
  
• C. ${40}^{o}C$ to ${100}^{o}C$
  
• D. ${30}^{o}C$ to ${200}^{o}C$
  

Answer 1

The correct option is A ${40}^{o}C$ to ${200}^{o}C$

The most common method of refining crude is the process of fractional distillation. This involves heating crude oil to about 350 degrees Celsius,to turn it into a mixture of gases. These are piped into a tall cylinder, known as a fractional tower. The higher the gas rises in the tower, the lower the temperature becomes. Petrol or gasoline, condenses out at around 110 degrees celsius, while petroleum gas is drawn off at the top. The distilled liquid from each level contains a mixture of alkanes, alkenes, and aromatic hydrocarbons with similar properties, and requires further refinement and processing to select specific molecules. A process called cracking is used to produce more of the lower molecular weight hydrocarbons from higher ones.