Fusel oil is the higher-alcohol fraction separated during ethanol distillation, made up mainly of amyl alcohols with smaller amounts of propanol, butanol and isobutanol. Volumes are meaningful wherever fuel ethanol is made at scale, and it is one of those co-products that gets sold cheaply because the producer treats it as a distillation nuisance rather than a chemical feedstock. We place it into mineral processing, solvent and chemical outlets, and we have people close to the Brazilian production base.
What it is
Fusel oil forms during fermentation and is drawn off during rectification. Composition depends on the feedstock (sugarcane, corn, grain, cassava), the yeast and the distillation configuration, so no two producers offer quite the same material. Typical yields run in the low single digits relative to ethanol output, which still adds up to substantial tonnage at a large plant.
The commercially interesting fraction is the amyl alcohols, principally isoamyl alcohol. Higher alcohols of this type are used across mineral processing, solvents, flavours and fragrances, and as chemical intermediates. Fusel oil is traded both as a crude mixture and, where a producer has the capability, as separated fractions that command considerably more.
Where it goes
One point we will not overstate. Fusel oil is sometimes presented as a direct substitute for mercury in gold recovery. The accurate version is narrower: mercury amalgamation is being displaced by gravity and flotation processing, and flotation needs frothers, which is where higher alcohols come in. If your interest is specifically the mercury-free gold route, tell us and we will work from your own technical requirement rather than from a marketing claim.
- Mineral processing and mining reagents. Higher alcohols are an established class of flotation frother, and the aliphatic alcohol frothers in general industrial use, MIBC most prominently, sit in the same chemical family. This is the outlet where fusel oil volume tends to find a home.
- Solvents and coatings. Amyl alcohols and their esters, particularly amyl acetate.
- Chemical intermediates. Feedstock for esterification and further upgrading into higher-value chemicals.
- Flavours and fragrances. For refined and separated fractions meeting the relevant purity and documentation requirements.
Specification and handling
It moves in drums, IBCs, isotanks and bulk depending on volume and destination. Because it is a flammable liquid, transport classification and terminal acceptance are worth settling early rather than at the booking stage.
| Alcohol breakdown | Percentages of isoamyl, amyl, isobutyl, butyl and propyl alcohol. The core of the offer. |
|---|---|
| Ethanol content | Residual ethanol carried over from rectification. |
| Water content | Often significant in crude fusel oil, and it drives both freight cost and buyer interest. |
| Acidity | Handling, storage and downstream processing. |
| Colour and appearance | Indicator of impurity load. |
| Density and refractive index | Routine identity checks. |
| Feedstock origin | Sugarcane, corn, grain or cassava. Affects the alcohol profile and some market access. |
| Flash point and classification | Flammable liquid: decides packaging, transport and terminal acceptance. |
| Crude or fractionated | Whether the material is the raw mixture or separated fractions. The price difference is large. |
How we broker it
We act for ethanol producers and distilleries placing a co-product they often have not marketed properly, and for reagent and chemical buyers sourcing higher alcohols. Our presence in Brazil matters here, because that is where a large share of world sugarcane ethanol, and therefore fusel oil, is produced.
The first thing we ask for is the alcohol breakdown. Without it an offer is just a barrel of mixed alcohols, and it prices like one.
Frequently asked questions
What is fusel oil?
The higher-alcohol fraction separated during ethanol distillation, consisting mainly of amyl alcohols with smaller amounts of propanol, butanol and isobutanol. It forms during fermentation and is drawn off during rectification. Composition varies with the feedstock, the yeast and the distillation setup.
What is fusel oil used for?
Mineral processing and mining reagents, solvents and coatings, chemical intermediates, and, for refined fractions, flavours and fragrances. Higher alcohols are an established class of flotation frother, which is the outlet that tends to absorb volume.
Does fusel oil replace mercury in gold mining?
Not directly, and we would rather be precise about this than repeat a claim we cannot support. What is accurate is that mercury amalgamation is being displaced by gravity and flotation processing, and flotation requires frothers, a role filled by higher alcohols of the type fusel oil contains. If mercury-free gold recovery is your specific application, work from your own technical requirement and we will source against it.
Is fusel oil sold crude or refined?
Both. Crude fusel oil is the raw mixture as drawn from the still. Where a producer can fractionate, separated cuts such as isoamyl alcohol command considerably more. The right question for a seller is whether fractionation is available nearby, because it often changes the economics more than price negotiation does.
Where does most fusel oil come from?
Wherever fuel ethanol is produced at scale, with Brazilian sugarcane ethanol a major source alongside corn and grain ethanol elsewhere. We have people in Brazil, which helps on both origination and verification.
How is fusel oil shipped?
Drums, IBCs, isotanks or bulk depending on volume and destination. It is a flammable liquid, so transport classification, packaging and terminal acceptance should be settled early rather than discovered at the booking stage.
Who to ask about Fusel oil
Ask us. Fusel oil to place, or sourcing higher alcohols? Send the alcohol breakdown and the water content. We answer the same working day, in English or Dutch, and there is no charge and no obligation for a market read or a second opinion on a specification.
You get Bart van den Brug directly, not a call centre and not a form that goes nowhere. We are an independent broker: we never take title, we do not trade our own book, and we are paid a commission only on business that actually concludes. That is why we will also tell you when the answer is no.
+31 6 115 83 448
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Sustainable Commodities 3 B.V., Lemmer, the Netherlands
Last reviewed 09 August 2026 by Bart van den Brug, Sustainable Commodities 3 B.V. (KvK 99665042), Lemmer, the Netherlands. Regulatory references are given for orientation and are not legal advice; verify against the current Official Journal text before contracting.