Naphtha

Definition

Naphtha is a light petroleum fraction with a boiling range of approximately 30–200°C (86–392°F), produced during crude oil distillation between liquefied petroleum gas (LPG) and kerosene/jet fuel in the atmospheric distillation column. It is a colourless to pale-yellow flammable liquid with a characteristic petroleum odour.

Naphtha is broadly divided into two grades:

• Light naphtha (LN): Boiling range ~30–90°C; used primarily in petrol blending and as a feedstock for isomerisation units (to improve octane)
• Heavy naphtha (HN): Boiling range ~90–200°C; the primary feedstock for catalytic reformers (producing reformate for petrol blending) and for steam crackers (producing ethylene and propylene)

Naphtha in the refinery product slate

Naphtha as petrochemical feedstock

The largest use of naphtha globally is as a steam cracker feedstock to produce ethylene, propylene, and other light olefins and aromatics. The process:

1. Naphtha is mixed with steam (to dilute hydrocarbons and reduce coke formation) and fed into a cracking furnace
2. At ~800–850°C with a residence time under 1 second, molecular bonds break (crack) to form smaller molecules
3. The cracked gas is rapidly quenched to 300°C within milliseconds to prevent the products from reacting further
4. Products are separated by compression and fractionation into: ethylene (~30%), propylene (~15%), butadiene (~4%), benzene, toluene, xylene (BTX aromatics), and pyrolysis gasoline

Ethylene is the world's most-produced organic chemical by volume — the foundation of the plastics and synthetic materials economy. A naphtha steam cracker producing 1 million tonnes/year of ethylene requires approximately 3–3.5 million tonnes of naphtha feedstock annually.

Naphtha vs ethane: the feedstock competition

In the United States, the shale gas revolution fundamentally shifted cracker feedstock economics. Natural gas liquids (NGLs), particularly ethane, are significantly cheaper than naphtha as a cracker feedstock and produce higher ethylene yields:

US and Middle Eastern crackers primarily use cheap ethane, giving them a significant cost advantage over European and Asian naphtha-based crackers. This cost disadvantage has driven European cracker rationalisation — several European ethylene plants have closed in recent years. The naphtha-ethane spread determines the competitiveness of European and Asian petrochemical producers.

For the LPG market context, see our LPG glossary entry. For natural gas and LNG pricing, see our LNG glossary entry. For crude oil pricing that underpins naphtha costs, see our Brent crude entry.

Naphtha pricing

Naphtha is priced in US dollars per metric tonne. Key benchmarks:

• CIF NWE naphtha: Cost, insurance, freight to Northwest Europe — the European benchmark, published by Platts (S&P Global) and Argus
• CFR Japan naphtha: The Asian benchmark, closely watched because Japan and South Korea are the largest naphtha cracking markets
• MOPJ (Mean of Platts Japan): The average of the month's daily Platts Japan naphtha assessments — used in long-term supply contracts in Asia

Naphtha typically trades at a discount to crude oil on an energy equivalent basis (naphtha crack is negative or at a small premium). The spread between crude and naphtha reflects refinery processing economics and the balance between supply (refinery yields) and cracker/blender demand. In periods of strong petrochemical demand, the naphtha crack tightens; in downturns, it weakens.

What is naphtha and what is petroleum naphtha used for?

Naphtha — specifically petroleum naphtha — is the lightest liquid fraction from crude oil distillation, with a boiling range of approximately 30-200 degrees C. It sits between LPG and kerosene in the refinery distillation column. Petroleum naphtha has two primary uses: as the dominant feedstock for steam crackers in Europe and Asia (where it is thermally cracked at 800-850 degrees C to produce ethylene and propylene — the building blocks of plastics), and as a petrol blending component (light naphtha, after catalytic reforming, boosts octane in the finished fuel). The U.S. EIA Weekly Petroleum Status Report tracks naphtha as part of the broader petroleum product slate, and the IEA's oil product analysis covers global naphtha demand trends.

Naphtha prices are highly correlated with crude oil but trade at a discount on an energy-equivalent basis. The naphtha-crude spread (or "naphtha crack") reflects the balance between refinery supply and demand from petrochemical crackers. When cracker demand is strong and plastics margins are healthy, naphtha prices firm relative to crude. The OPEC Annual Statistical Bulletin provides data on naphtha production by region, and the European Commission's weekly oil bulletin includes naphtha pricing alongside other refined products.