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.
- 1Fermentation and distillation
- 2Higher alcohols drawn as a side-cut
- 3Water washed and separated
- 4Assayed on isoamyl content
- 5Solvent, flavour or fuel outlet
Volume follows ethanol production and cannot be dialled up on its own. The isoamyl alcohol fraction decides whether it is a solvent feedstock or simply a fuel component.
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.
What fusel oil is, and why it has two completely different buyers
Fusel oil is the higher-alcohol fraction drawn off during ethanol distillation: mostly iso-amyl alcohol with propanol, butanol and traces of ester and water. It is a by-product, which means the volume exists whether or not anyone wants it, and that shapes the whole market.
| Parameter | What it decides | Note |
|---|---|---|
| Iso-amyl alcohol content | Value for the refining route | The fraction a solvent or fragrance buyer is chasing |
| Water content | Whether it needs drying before use | Usually the first thing a buyer asks after purity |
| Ethanol carry-over | Excise and classification questions | Can turn a simple movement into a duty conversation |
| Colour and odour | Suitability for the higher-value outlets | Fragrance and solvent buyers are far fussier than fuel buyers |
| Origin feedstock | Certification route if it goes to fuel | Grain, cane and beet distilleries give different profiles |
Two buyers, and they want opposite things. A refiner separating iso-amyl alcohol for solvents, fragrances and specialty chemicals pays for purity and consistency. A fuel or energy buyer pays for calorific value and takes it as it comes. The first pays much better and is far harder to satisfy.
Because it is a co-product, the seller usually has continuous arisings and no natural home for them. That makes reliability of offtake worth more than a marginal price improvement on one load, which is why most of what we do here is term rather than spot.
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. |
What a fusel oil buyer will ask you
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.
Composition, and why the buyer decides what it is worth
Fusel oil is the higher alcohol fraction drawn off during ethanol distillation. It is not one substance but a mixture, and which buyer wants it depends entirely on what dominates that mixture.
- Isoamyl alcohol is usually the largest single component and the reason the chemical market is interested at all. Where it is high and the parcel is clean, the flavour, fragrance and solvent routes open up and they pay considerably better than fuel.
- Other higher alcohols, chiefly propanol and butanol isomers, in proportions that vary with the feedstock and the distillation.
- Residual ethanol and water, which matter more than people expect. A wet parcel is a diluted parcel, and water drives both freight cost per useful tonne and the buyer's separation cost.
- Origin matters because it predicts composition. Cane, grain and beet ethanol produce recognisably different fusel profiles.
So the single most useful thing you can put on a fusel oil offer is a composition breakdown rather than just a volume and a price. Sellers who quote only tonnage get fuel-level bids; sellers who quote the alcohol split and the water content get to have the chemical conversation. It is the same parcel and a different price.
Frequently asked questions
What should a fusel oil offer contain?
A composition breakdown, not just tonnage. Isoamyl alcohol content above all, then the other higher alcohols, residual ethanol and water, plus the ethanol feedstock the fusel came from, because cane, grain and beet give recognisably different profiles. Sellers who quote only volume get fuel-level bids. Sellers who quote the alcohol split get to have the chemical conversation, which pays better.
Why does the water content of fusel oil matter so much?
Because you pay freight on it and the buyer pays to remove it. A wet parcel is a diluted parcel, so the price per useful tonne can be a long way from the headline price per tonne. It is one of the easiest things to measure and one of the most commonly left off an offer.
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.
Market news
Recent headlines from across the feedstock and renewable fuel sector. Nothing specific to this market has come through the wires lately, so this is the wider view. The links go to the publisher; we do not host or edit their reporting, and a headline here is not our endorsement of it. Scroll for more.
- Kimchi waste could become viable feedstock for bioplastics
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- Eni and PETRONAS to explore high-performance bio-gasoline
- Linglong signs $2 billion Egypt investment MoU
- BTMA to represent European national associations at Tyres Europe board meetings
- Osaka Gas claims STS LNG bunkering first in Osaka Bay
- ISWG-GHG 22: Non-profits react
- USTC brings Copenhagen-based offices together in new hub
- ORLEN instigates new Baltic regional energy initiative
- TotalEnergies Lubmarine launches lubricant for 4-stroke medium speed marine engines
- IMO carbon price heads for December showdown
- LyondellBasell: Pyrolysis Reactors Installed for MoReTec Plant in Wesseling
- Sustainable aviation fuel pioneer completes successful trials
- Louis Dreyfus Company to generate biogas from citrus waste
- Nature by Design: A decade of IUCN, Monaco collaboration driving circular solutions for biodiversity
- European Digital Sustainability Skills Conference
- UCL reacts to IMO ISWG-GHG: ‘Steady progress on the Net Zero Framework’ made but ‘high uncertainty’ remains
- ISWG-GHG 22: ‘Genuine willingness’ for further NZF progress, observes Chair
18 headlines, updated automatically. Last refreshed .
Sources and further reading
Primary sources for the rules and figures on this page, so you can check them yourself. Legislation is amended: always read the consolidated text on the date that matters to you.
Who to ask about Fusel oil
Just ask. Fusel oil to place, or sourcing higher alcohols? Send the alcohol breakdown and the water content. You get Bart van den Brug on the other end, same working day, in English or Dutch, and across the team also in French, Portuguese, Polish, Czech and Russian.
On how we work: on the feedstocks and fuels on this site we are a broker. We never take title, we do not trade our own book, and we are paid a commission on business that concludes. Additives are the one exception: those we also buy and sell for our own account, and we say in which capacity we are acting before you commit to anything. Either way you will hear it from us when the answer is no, or when your parcel is not ready for the conversation you want to have. A market read or a second opinion on a specification costs nothing and commits you to nothing.
Happy to look at whatever you have, even if it is half an analysis and a question.
+31 6 115 83 448
bart@sustainablecommodities.eu
Sustainable Commodities 3 B.V., Lemmer, the Netherlands
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Last reviewed 08 September 2026. Regulatory references are given for orientation and are not legal advice: verify against the current Official Journal text before contracting.