Title: delayed coke
Long Title: IUPAC Gold Book - delayed coke
DOI: 10.1351/goldbook.D01577
Status: current

Definition
A commonly used term for a primary carbonization product (green or raw coke) from high-boiling hydrocarbon fractions (heavy residues of petroleum or coal processing) produced by the delayed coking process.

Note
Delayed coke has, with only a few exceptions, a better graphitizability than cokes produced by other coking processes even if the same feedstock is used. Delayed coke contains a mass fraction of volatile matter between 4 and 15 wt% which can be released during heat treatment.

Related Terms
- carbonization: https://goldbook.iupac.org//terms/view/C00840
- cokes: https://goldbook.iupac.org//terms/view/C01142
- coking: https://goldbook.iupac.org//terms/view/C01144
- delayed coking process: https://goldbook.iupac.org//terms/view/D01578
- green: https://goldbook.iupac.org//terms/view/G02697
- mass fraction: https://goldbook.iupac.org//terms/view/M03722
- raw coke: https://goldbook.iupac.org//terms/view/R05158

Source
- PAC, 1995, 67, 473. 'Recommended terminology for the description of carbon as a solid (IUPAC Recommendations 1995)' on page 486 (https://doi.org/10.1351/pac199567030473)

Other Outputs
- html: https://goldbook.iupac.org/terms/view/D01577/html
- json: https://goldbook.iupac.org/terms/view/D01577/json
- xml: https://goldbook.iupac.org/terms/view/D01577/xml

Citation: Citation: 'delayed coke' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.D01577
License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms.
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Disclaimer: The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using.
Accessed: 2026-04-19T06:00:55+00:00