A spec sheet lands on the desk reading only “solvent: d-limonene,” with no context on how strong it is, what it will and will not clean, or what grade to order. D-limonene is one of the most widely used bio-based solvents in industry, but the marketing pages that rank for it rarely give a buyer the numbers needed to size it against the job. This guide does.
The short version: d-limonene (CAS 5989-27-5) is a bio-based cyclic terpene solvent recovered from citrus peel. Its molecular formula is C10H16 and its molecular weight is 136.23 g/mol. It has a Kauri-Butanol (KB) solvency value of about 67, which is roughly twice that of mineral spirits, so it cuts oils, greases, tars, adhesives, and oilfield deposits well. It evaporates slowly, is flammable (flash point ~48 °C), and is a moderate-strength, renewable alternative to chlorinated and petroleum solvents for cold cleaning.
What d-limonene is
D-limonene is the (R)-enantiomer of limonene, a monocyclic terpene (PubChem CID 440917). It is the molecule responsible for the smell of oranges, and it is recovered from citrus peel, mainly orange, as a co-product of juice and citrus processing. As an industrial material it is a clear, colorless to pale-yellow liquid with a strong citrus odor, a density of about 0.841 (it floats on water), and a boiling point near 176 °C.
The “d-” matters. The d-enantiomer from citrus is the commercial industrial grade; the l-enantiomer and racemic dipentene come from other sources and smell and behave differently. A Certificate of Analysis (CoA) confirms the d-form through optical rotation.
How d-limonene is produced
D-limonene is not synthesized; it is recovered. Citrus processors cold-press and steam-distill peel oil, then concentrate the limonene fraction by distillation. Lower-purity citrus distillate is often sold as “orange terpene,” while further distillation yields high-purity d-limonene and food-grade material. Because the feedstock is a renewable processing co-product, supply and price track the citrus crop, which is why availability tightens with poor harvests.
Solvency: the KB value is the number that matters
The single most useful number for a solvent buyer is the Kauri-Butanol value, measured by ASTM D1133. It scores how aggressively a hydrocarbon solvent dissolves a standard resin. D-limonene sits around 67, which is moderate-to-strong.
| Solvent | Approx. KB value | Relative strength |
|---|---|---|
| n-Heptane / mineral spirits | ~30 to 38 | weak |
| D-limonene | ~67 | moderate to strong |
| Trichloroethylene (TCE) | ~129 to 130 | aggressive |
A KB around 67 means d-limonene out-dissolves mineral spirits on heavy organic soils while staying below the aggressive chlorinated solvents it often replaces. The trade-off is covered in how d-limonene compares to petroleum-based solvents.
What d-limonene dissolves
Its solvency profile makes it effective on a specific set of soils:
- Oils, greases, waxes, and cosmoline
- Cured and uncured adhesives, label adhesive, and mastic
- Inks, tars, bitumen, and carbonized residues
- Oilfield paraffin and asphaltene deposits
- Many resins and uncured coatings
It is slow to evaporate, which is an advantage in immersion and soak cleaning (longer dwell, longer bath life) and a disadvantage where a fast, residue-free flash-off is required.
Where d-limonene is used industrially
| Application | Role |
|---|---|
| Industrial degreasing and parts cleaning | Bio-based solvent replacing chlorinated and petroleum cleaners |
| Solvent substitution programs | Drop-in candidate for nPB, TCE, perchloroethylene, mineral spirits (cold cleaning) |
| Adhesive, label, and mastic removal | Dissolves and lifts adhesive residues |
| Oil and gas well and tank cleaning | Disperses paraffin and asphaltene |
| Flavor, fragrance, and formulation | Food-grade (FCC) citrus aroma and feedstock |
Grades and what to order
D-limonene is sold across a range of purities: technical grade (roughly 90 to 95%), high-purity grades (95 to 99%), and food/FCC grade, plus lower-purity “orange terpene.” The grade controls purity, color, peroxide level, and price, and the right one depends on whether you are degreasing a shop floor or formulating a food product. The grade and CoA detail are covered in the d-limonene grades and specification guide.
Where d-limonene is the wrong tool
The honest distributor position is that d-limonene is a strong, renewable solvent for the right jobs and a poor choice for others.
It is not the right tool when you need a fast, residue-free flash-off (it is slow-evaporating and leaves an oily film), when you need a nonflammable solvent for closed-loop vapor degreasing (it is flammable, flash point ~48 °C), or when the part is made of polyethylene or polypropylene (d-limonene attacks them and swells many elastomers). Its environmental positioning also has limits, as set out in is d-limonene a green solvent.
Buying d-limonene in bulk
RawSource supplies d-limonene (CAS 5989-27-5) in drums, IBC totes, and pallet quantities for industrial manufacturing, cleaning, and solvent-replacement programs, with CoA documentation. Tell us the soil you need to remove, the solvent you are replacing, your flash-point and materials constraints, and your grade requirement, and request a sample to validate solvency on your own parts before a bulk order.
Frequently asked questions
What is d-limonene used for?
Industrially, d-limonene is used as a bio-based degreaser and cleaning solvent, as a replacement for chlorinated and petroleum solvents in cold cleaning, for adhesive and ink removal, for dispersing oilfield paraffin and asphaltene, and as a food-grade flavor and fragrance component.
What is the KB value of d-limonene?
About 67 by ASTM D1133, which is moderate-to-strong solvency, roughly twice that of mineral spirits (~30 to 38) and below aggressive chlorinated solvents such as TCE (~130).
What is the difference between d-limonene and orange terpene?
“Orange terpene” is lower-purity citrus distillate; d-limonene is the purified, higher-assay grade. Both come from citrus peel, but purity, color, odor, and price differ, so confirm the grade and assay on the CoA.
Is d-limonene flammable?
Yes. D-limonene has a closed-cup flash point of about 48 °C (118 °F) and is classified as a flammable liquid (GHS H226). It is not a drop-in for nonflammable vapor-degreasing solvents without engineering controls.
What grade of d-limonene should I buy?
Technical grade for industrial cleaning and degreasing; high-purity or food/FCC grade for formulation, flavor, and fragrance. Match the grade to the application and confirm purity and peroxide value on the CoA.
Editorial note. This article is general technical guidance for industrial and professional buyers. D-limonene here is an industrial solvent and feedstock, not a consumer, supplement, or health product, and nothing here is a health or efficacy claim. Physical-property, solvency, and grade figures are typical reference values from authoritative public sources and product literature, to validate for your application; the Certificate of Analysis governs the material you buy. Always consult the current Safety Data Sheet (SDS) before handling. RawSource makes no warranty, express or implied, and assumes no liability for use of this information.
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