Crude distillation yields: Approximately what percentage (by volume) of straight-run gasoline is obtained from a typical crude oil without conversion processes?

Introduction:
“Straight-run” gasoline refers to the naphtha-range material obtained directly from atmospheric/vacuum distillation without catalytic or thermal conversion. The percentage varies with crude type but falls within a known range for typical crudes.

Given Data / Assumptions:

• Typical medium crude slate.
• Common refinery yield expectations prior to conversion.

Concept / Approach:
Crude assays and textbook references commonly cite straight-run gasoline yields around 10–20% by volume for many crudes, often near the mid-teens. A representative figure in exam contexts is ~18%.

Step-by-Step Solution:

Verification / Alternative check:
Assay tables for medium crudes show straight-run gasoline/naphtha near the high teens by volume.

Why Other Options Are Wrong:

• 6: Represents very heavy crude extremes.
• 38/52: Unrealistic for straight-run; such pool shares require conversion/upgrade.
• 28: Above typical straight-run ranges.

Common Pitfalls:
Confusing the final gasoline pool (post-conversion blending) with straight-run naphtha.

Final Answer:
18