What process is used to separate crude oil into fractions?

What process is used to separate crude oil into fractions?

• A. Fractional distillation
• B. Cracking
• C. Fermentation
• D. Polymerization

Answer: (A)

This question tests your understanding of how crude oil is separated into different hydrocarbon fractions by boiling point using fractional distillation. When crude oil is heated, its many hydrocarbons boil off at different temperatures. A tall fractionating column creates a temperature gradient—from hot at the bottom to cooler at the top. The vapors rise and encounter cooler surfaces; components with higher boiling points condense lower in the column, while those with lower boiling points rise higher and condense near the top. This way, the original mixture is split into distinct fractions, each containing hydrocarbons within a narrower boiling-point range, such as heavier fuels lower down and lighter fuels higher up. The column often contains trays or packing to improve contact between rising vapors and the condensed liquid, making the separation more effective. Cracking, fermentation, and polymerization are different processes: cracking breaks large molecules into smaller ones, fermentation converts sugars to alcohol, and polymerization links monomers to polymers. So the separation of crude oil into fractions is achieved by fractional distillation.

This question tests your understanding of how crude oil is separated into different hydrocarbon fractions by boiling point using fractional distillation. When crude oil is heated, its many hydrocarbons boil off at different temperatures. A tall fractionating column creates a temperature gradient—from hot at the bottom to cooler at the top. The vapors rise and encounter cooler surfaces; components with higher boiling points condense lower in the column, while those with lower boiling points rise higher and condense near the top. This way, the original mixture is split into distinct fractions, each containing hydrocarbons within a narrower boiling-point range, such as heavier fuels lower down and lighter fuels higher up. The column often contains trays or packing to improve contact between rising vapors and the condensed liquid, making the separation more effective. Cracking, fermentation, and polymerization are different processes: cracking breaks large molecules into smaller ones, fermentation converts sugars to alcohol, and polymerization links monomers to polymers. So the separation of crude oil into fractions is achieved by fractional distillation.