CNSL brokerage: cashew nut shell liquid

It is blended into marine fuel and the interest is growing, because cashew shells are an abundant residue, naturally low in sulphur, and heat-treated shells have been reported at energy content around 35.8 MJ/kg against roughly 23.6 MJ/kg raw. Blend trials around 20 percent CNSL have been reported as behaving broadly like diesel. But it is not a settled route. High acidity brings corrosion risk, the polymeric content brings fouling and stability risk, and composition varies with origin and extraction. Plenty of receivers refuse a CNSL-bearing blend on that basis alone. Establish the receiver's position before you build a cargo around it.

Three reasons, and they are technical rather than commercial. CNSL is acidic, which is a corrosion question for pumps, lines and engine components. It polymerises, which is a fouling and stability risk in a fuel system even though it is exactly what a resin plant wants. And its composition varies with origin, season and extraction method, which makes a repeatable blend harder to guarantee. Acid value is usually the number the conversation turns on.

The feedstock argument is strong. The shell is around 70 to 75 percent of the weight of the nut, it is largely a disposal problem today, and it competes with no food use, so the volume is genuinely additional. Whether a given parcel qualifies under a specific scheme is a separate question and depends on the certification chain, not on the material being a residue. Ask about the paperwork before you assume the claim.

Cashew nut shell liquid: the dark, viscous, caustic liquid contained in the cashew nut shell. It is a natural source of long-chain phenols, principally anacardic acid, cardanol and cardol, which is why it is valued as a chemical feedstock rather than simply as an energy product.

Technical CNSL is produced by thermal processing of the shells at roughly 180 to 200 °C, during which anacardic acid decarboxylates into cardanol, giving a cardanol-rich product typically around 60 % cardanol. Natural or acid grade CNSL is cold-extracted and retains anacardic acid. They are different chemistries with different buyers.

Phenolic resins, epoxy curing agents, friction materials such as brake linings, anti-corrosion coatings, surfactants and plasticisers. The long unsaturated side chain gives properties petroleum-derived phenol does not, which is the basis of most cardanol applications.

CNSL is the raw material as it comes out of the shell. Cardanol is what you get when you distil it. The oleochemical sector expects cardanol at a stated purity, commonly 95 % or higher and often 98 %. In the energy sector material is regularly offered as cardanol at far lower purity with no percentage stated at all. They are not the same product and they should not carry the same name.

Usually purity, and usually undeclared. Distillation costs more than the CNSL going into it, so properly distilled high-purity cardanol is genuinely more expensive. The cheap offer is often material that has not been distilled to the purity the name implies. Ask for the purity percentage in writing: if it is not on the offer it is not a specification.

It is the fraction of CNSL that causes most of the downstream trouble. Material sold without that fraction properly handled creates problems for whoever receives it, and it is frequently not mentioned on an offer at all. Distillation deals with it, which is one of the reasons distilled product is worth the difference. Ask explicitly whether it has been addressed.

It happens, but do not build a cargo around it without checking. A blend carrying CNSL is contentious and some receivers refuse it on that basis alone, regardless of whether the sulphur arithmetic works. Establish the receiving party's position first, then do the blend calculation.

Vietnam and Africa. Those are the two origins we actually work, and we would rather say that than list every country that grows cashews. Both regions have processors investing in distillation capacity to compete on the higher-value light-coloured grades.

Yes, and it is an outlet a lot of sellers overlook. CNSL works as a blend component in marine fuel, which absorbs material that would otherwise sit. How much can go in is governed by sulphur and the applicable marine limits, so it is a blend calculation rather than a straight substitution.

Residue and pitch fractions and off-specification material do go to fuel outlets. For on-specification technical CNSL and distilled cardanol the chemical outlets pay considerably better, so selling good material as fuel is usually leaving money on the table.

Grade, cardanol percentage, cardol percentage, polymer content, moisture and viscosity, plus origin. A great deal of CNSL is offered as a generic dark oil with no analysis, and it prices accordingly, well below what the same material would fetch properly documented.