Benzene: Production route
Why benzene is almost always someone else's by-product
Why benzene is almost always someone else's by-product What this tab covers How it is made: the main production routes or, for product families, the main product types and technologies, compared on share of supply, inputs per tonne, plant scale, yield, co-products and unit cost.Benzene is rarely made for its own sake. Most comes as one fraction of a mixed aromatics stream from refinery reformers or cracker pyrolysis gasoline, recovered by solvent extraction. Producers then adjust the mix with toluene conversion units, which turn lower-value toluene into benzene and xylenes. A smaller share, mainly in China, comes from hydrorefining crude benzene recovered at coke ovens. Because supply follows gasoline, paraxylene and ethylene economics, benzene output does not respond cleanly to benzene prices.
Routes compared
| Route | Share of supply | Inputs per tonne | Typical scale | Yield | Co-products | Unit cost |
|---|---|---|---|---|---|---|
| Catalytic reforming plus extraction | about 35-40% (indicative) | depends on naphtha composition; benzene is typically 5-10% of reformate (indicative) | 0.2-1.5 Mt/yr per complex; Hengli Dalian 1.42 Mt/yr benzene (OPIS, May 2026) | co-product with toluene, xylenes and hydrogen | hydrogen, toluene, xylenes, raffinate to gasoline | set by naphtha opportunity cost; producers need a benzene-naphtha spread of about $150-200/t to break even (OPIS, May 2026) |
| Pyrolysis gasoline from steam crackers | about 30% (indicative) | naphtha crackers yield about 6-8% benzene on feed (indicative) | tied to 1 Mt/yr-class crackers | co-product of ethylene | ethylene, propylene, butadiene, toluene | low marginal cost; volume set by ethylene run rates |
| Toluene conversion (disproportionation, transalkylation, hydrodealkylation) | about 20-25% (indicative) | about 2.2-2.5 t toluene per t benzene in disproportionation, with xylenes co-product; about 1.2 t toluene per t benzene in hydrodealkylation (indicative) | 0.3-1 Mt/yr | near-stoichiometric | xylenes, methane, fuel gas | toluene price plus about $50-100/t conversion (indicative) |
| Coke-oven crude benzene hydrorefining | about 5-10% (indicative, mostly China) | about 10 kg crude benzene per t of coal coked (indicative) | 0.1-0.3 Mt/yr | high on crude benzene | toluene, xylene, heavy residues | tied to coke output, not benzene price |
How each route works
Catalytic reforming plus extractionHeavy naphtha is reformed over platinum catalysts into an aromatics-rich reformate. Extractive distillation or liquid-liquid extraction with sulfolane separates benzene, toluene and xylenes, then fractionation yields nitration-grade benzene. Often integrated with paraxylene complexes.
Large and integrated, but output follows paraxylene and gasoline demand.
OPIS, Mar and May 2026; share indicative Pyrolysis gasoline from steam crackersNaphtha or heavier liquid feed in steam crackers yields pyrolysis gasoline rich in benzene. It is hydrotreated to remove dienes and sulphur, then extracted. Ethane crackers produce almost none, so the US shale shift cut this source.
Cheap marginal supply, but falls when crackers cut runs, as in Korea and China in March 2026 (OPIS).
OPIS, Mar 2026; share indicative Toluene conversion (disproportionation, transalkylation, hydrodealkylation)Toluene is reacted over zeolite catalysts to give benzene and xylenes, or with C9 aromatics to give more xylenes. Hydrodealkylation strips the methyl group with hydrogen to give benzene and methane. Used when benzene and xylenes are dearer than toluene.
Flexible swing supply; profitable only when the benzene-toluene spread is wide.
indicative, standard process data; Mysteel, Jan 2026 (HDA benzene in China additions) Coke-oven crude benzene hydrorefiningLight oil recovered when coal is coked for steelmaking is hydrogenated and extracted to give benzene. Significant in China, small elsewhere. India's integrated steelworks recover small volumes of benzol.
Uses a steel by-product, but output falls as blast furnaces decline.
indicative Unit economics are indicative ranges from the sources named; costs move with feedstock and energy prices, plant size and region.