# Industrial applications of higher alkanols
Higher alkanols are monohydric aliphatic alcohols of six or more carbon atoms, a class the chemical industry calls higher alcohols. Two volume classes dominate: plasticizer alcohols (C6–C11), led by 2-ethylhexanol, and fatty alcohols (C12–C18), which feed detergent surfactants.[1](https://doi.org/10.1002/0471238961.1921182216052005.a01.pub2) • [2](https://onlinelibrary.wiley.com/doi/10.1002/14356007.a01_279.pub2) Historically these alcohols came from natural fats, oils, and waxes, but petrochemical synthetic processes now supply most of the market, with oleochemical routes still competing in the detergent range.[1](https://doi.org/10.1002/0471238961.1921182216052005.a01.pub2)
| Key fact | Value |
|---|---|
| Class definition | Monohydric aliphatic alcohols of six or more carbons are "higher alcohols"[1](https://doi.org/10.1002/0471238961.1921182216052005.a01.pub2) |
| Largest-volume synthetic member | 2-Ethylhexanol (C8H18O), used mainly for the PVC plasticizer bis(2-ethylhexyl) phthalate (DOP/DEHP)[3](https://doi.org/10.1002/0471238961.1925142023010714.a01) |
| Plasticizer vs detergent split | Plasticizer alcohols C6–C11; fatty (detergent) alcohols C12–C18[2](https://onlinelibrary.wiley.com/doi/10.1002/14356007.a01_279.pub2) |
| Main synthetic routes | Ziegler, oxo (hydroformylation), and aldol from petroleum feedstocks[3](https://doi.org/10.1002/0471238961.1925142023010714.a01) |
| Historical world capacity | ~5.3 million t/yr in early 1990, about 90% petroleum-derived |
| OxO branching | Conventional cobalt catalysts give 40–50% branched product; modified catalysts 15–25% |
| Toxicology | Higher alcohols are among the less toxic of commonly used chemicals[1](https://doi.org/10.1002/0471238961.1921182216052005.a01.pub2) |
## What higher alkanols are and why end use tracks carbon number
End use tracks chain length. Short alcohols (C1–C6) evaporate readily and serve as solvents and diluents for paints; the C6–C11 range has low enough volatility and the right solvency for permanent incorporation into polymers as plasticizer esters; C12–C18 chains are long enough to form ordered surface-active sulfate, ethoxylate, and ethoxysulfate derivatives.[2](https://onlinelibrary.wiley.com/doi/10.1002/14356007.a01_279.pub2) • [1](https://doi.org/10.1002/0471238961.1921182216052005.a01.pub2) The industrially most important alcohols are therefore methanol, ethanol, 1-propanol, 1-butanol, isobutanol, the plasticizer alcohols (C6–C11), and the fatty alcohols (C12–C18) used for detergents.[2](https://onlinelibrary.wiley.com/doi/10.1002/14356007.a01_279.pub2)
A note on terminology: the standard reference convention defines higher alcohols as C6 and above.[1](https://doi.org/10.1002/0471238961.1921182216052005.a01.pub2) For industrial use, isomeric mixtures are often preferred because pure single-isomer alcohols are too expensive.[2](https://onlinelibrary.wiley.com/doi/10.1002/14356007.a01_279.pub2)
## Plasticizer alcohols: the 2-ethylhexanol core
**2-Ethylhexanol is by far the largest-volume synthetic higher alcohol**, consumed mainly to make bis(2-ethylhexyl) phthalate (C24H38O4), the PVC plasticizer commonly called dioctyl phthalate or DOP.[3](https://doi.org/10.1002/0471238961.1925142023010714.a01) The alcohol itself is made from n-butyraldehyde by aldol addition in an alkaline medium at 80–130 °C and 300–1010 kPa (3–10 atm).
Producer integration reinforces this pattern. Most manufacturers sell a portion of their alcohol output on the merchant market and retain the rest for internal use, typically for the manufacture of plasticizers.[1](https://doi.org/10.1002/0471238961.1921182216052005.a01.pub2)
The retrieved evidence does not document how phthalate restrictions since the 2010s have shifted demand from DEHP toward DINP and DIDP, so no claim on that transition is made here; nor does the evidence describe the molecular mechanism by which C8 plasticizer esters soften PVC or the migration and volatility limits on chain length.
## Detergent-range alcohol derivatives
C12–C18 fatty alcohols are consumed mainly as sulfate, ethoxy, and ethoxysulfate derivatives: alkyl sulfates, alcohol ethoxylates, and alcohol ether sulfates, the workhorse anionic and nonionic surfactants of household and industrial detergents. The same alcohols also find use in cosmetics and pharmaceuticals.[1](https://doi.org/10.1002/0471238961.1921182216052005.a01.pub2)
Oleochemical supply rests on hydrogenolysis (breaking chemical bonds using hydrogen, often with a catalyst): fatty alcohols are produced by hydrogenolysis of methyl esters or fatty acids in the presence of a heterogeneous catalyst, with three principal hydrogenolysis processes in worldwide use (copper chromite and copper-zinc systems are the classical catalysts).[1](https://doi.org/10.1002/0471238961.1921182216052005.a01.pub2) Synthetic supply comes from the oxo and Ziegler routes described below.[3](https://doi.org/10.1002/0471238961.1925142023010714.a01) In the United States, most detergent-range alcohol production is by synthetic processes, in contrast to regions with cheaper natural feedstocks.[1](https://doi.org/10.1002/0471238961.1921182216052005.a01.pub2)
## Solvent, intermediate and specialty roles
Beyond the two volume classes, alcohols serve as solvents and diluents for paints (mainly the C1–C6 members), as intermediates in the manufacture of esters and a range of other organic compounds, and as flotation agents, lubricants, and fuels or fuel additives.[2](https://onlinelibrary.wiley.com/doi/10.1002/14356007.a01_279.pub2) For the synthetic higher alcohols specifically, Kirk-Othmer lists solvents and specialty esters as the lower-volume application areas alongside plasticizers.[3](https://doi.org/10.1002/0471238961.1925142023010714.a01)
The retrieved evidence does not cover fragrance and flavor alcohols (such as octanol or nonanol) or their volumes relative to bulk plasticizer alcohols, so those uses are not quantified here.
## Synthesis routes and branching: how route shapes end-use fit
All the major routes start from petroleum-based raw materials: the Ziegler, oxo, and aldol processes account for the main industrial production of C6–C18 alcohols.[3](https://doi.org/10.1002/0471238961.1925142023010714.a01) A 2025 review of higher fatty alcohol technology lists the processes introduced into or close to industrial use as hydrogenation, the Bouveault–Blanc method, the Bashkirov method, the SHOP process, and the [Ziegler process](https://www.edgepedia.org/ziegler-process).[4](https://doi.org/10.3103/s0361521925600890)
Branching level is the key property that routes confer. From a conventional cobalt-catalyzed oxo process, the typical product of a linear olefin is 40–50% branched; modified catalysts reduce branching to 15–25%. All oxo products are primary alcohols with one more carbon than the feedstock olefin. Shell's SHOP (Shell Higher Olefin Process) supplies C11–C14 linear internal olefins specifically for producing C12–C15 detergent-range oxo alcohols, an example of route selection matched to end use.
At the small end, Guerbet chemistry makes branched specialty alcohols used in cosmetics. Some 2,000–3,000 t/yr of these specialty branched alcohols are produced in the United States (Exxon) and in Germany (Henkel), a volume orders of magnitude below oxo output.
## By the numbers (with caution)
The only global figure in the retrieved evidence is historical: worldwide capacity for all higher alcohols was approximately 5.3 million metric tons per annum in early 1990, 90% of it petroleum-derived, with oxo capacity around 4.2 million t/yr, Ziegler 0.3 million t/yr, and paraffin oxidation 0.2 million t/yr. No retrieved source provides post-1990 global capacity or current market-size figures, growth rates for plasticizer versus detergent alcohols, or the market positions of BASF, Dow, Shell, Evonik, KLK, and Wilmar; those quantities remain unverified here.[4](https://doi.org/10.3103/s0361521925600890)
## References
1. Alcohols, Higher Aliphatic, Survey and Natural Alcohols Manufacture. Kirk-Othmer Encyclopedia of Chemical Technology. https://doi.org/10.1002/0471238961.1921182216052005.a01.pub2
2. Falbe J. et al. Alcohols, Aliphatic. Ullmann's Encyclopedia of Industrial Chemistry, 2013. https://onlinelibrary.wiley.com/doi/10.1002/14356007.a01_279.pub2
3. Alcohols, Higher Aliphatic, Synthetic Processes. Kirk-Othmer Encyclopedia of Chemical Technology. https://doi.org/10.1002/0471238961.1925142023010714.a01
4. Evolution of Technological Processes for the Production of Higher Fatty Alcohols from Natural and Petrochemical Raw Materials: History and Prospects (A Review). Petroleum Chemistry, 2025. https://doi.org/10.3103/s0361521925600890
---
*Topic: Encyclopedia › Physical world and mathematics › Chemistry › Organic substances › Alcohols, ethers, and organooxygen groups › Alcohols and polyols › Higher and branched alkanols (C5+) › Higher-alkanol applications (plasticizers, detergents, fragrances, solvents)*
*Initially written Sep 17, 2026 · Edited: Oct 11, 2026; Oct 15, 2026; Nov 11, 2026*
*Copyright 2026 EdgeChat AI, a subsidiary of Biostate AI.*
License: Edgepedia Community License 1.0, https://www.edgepedia.org/edgepedia/license