Aromatics production in refining: Which process is specifically used to convert suitable hydrocarbon streams into aromatics (e.g., benzene, toluene, xylenes)?

Introduction / Context:Aromatics like BTX are produced in refineries and petrochemical complexes by upgrading naphtha. Aromatics are key petrochemical building blocks and contribute to gasoline octane when blended appropriately.

Given Data / Assumptions:

• Feedstock: heavy naphtha rich in naphthenes/paraffins.
• Objective: generate aromatics and hydrogen.
• Platforming/CCR reforming catalysts: Pt and Pt-Re on alumina.

Concept / Approach:Catalytic reforming dehydrogenates naphthenes to aromatics and dehydrocyclizes paraffins, raising octane and producing hydrogen. FCC cracks heavier feed to lighter products, hydrotreating removes heteroatoms, and alkylation combines light olefins with isobutane to make high-octane isoparaffins; none of these are primary aromatics generators from naphtha.

Step-by-Step Solution:Match process to outcome → aromatics production → catalytic reforming.Other listed processes do not primarily create BTX from naphtha.

Verification / Alternative check:Process flow diagrams show reformers feeding aromatics extraction units (e.g., sulfolane extractors) for BTX recovery.

Why Other Options Are Wrong:

• FCC: mainly gasoline/LPG; limited aromatics formation, not the targeted BTX route.
• Hydrotreating: saturation/removal of S/N; not aromatization.
• Alkylation: makes isoparaffins, not aromatics.

Common Pitfalls:Confusing “reforming” (dehydrogenation/cyclization) with “cracking” (C–C scission) and “alkylation” (C–C addition).

Final Answer:Catalytic reforming