Edeleanu solvent extraction of kerosene In the Edeleanu process (liquid SO2 extraction at about −20 °C), which component family in kerosene is preferentially reduced to improve burning quality?

Introduction / Context:
The Edeleanu process uses liquid sulphur dioxide as a selective solvent to improve kerosene quality. Lower aromatic content generally improves smoke point and combustor performance by reducing soot formation.

Given Data / Assumptions:

• Operating temperature is near −20 °C.
• Feed: kerosene-range hydrocarbons.
• Goal: enhance burning characteristics (smokeless flame).

Concept / Approach:
Liquid SO2 preferentially dissolves aromatics. Extraction transfers aromatics into the solvent-rich phase, leaving a raffinate leaner in aromatics. Since aromatics correlate with lower smoke point, their reduction raises the smoke point and improves flame luminosity behavior.

Step-by-Step Solution:

Verification / Alternative check:
Classic refining texts list Edeleanu under aromatic extraction processes for kerosene/jet precursors.

Why Other Options Are Wrong:

• Paraffins / Naphthenes: These are not the primary targets; they remain largely in the raffinate.
• Smoke point: Smoke point is a property, not a component family; the process raises smoke point by reducing aromatics.

Common Pitfalls:
Interpreting the property “smoke point” itself as the thing being extracted; in reality, component removal changes the property.

Final Answer:
Aromatics