 Example component of naphthenic acid
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| Identifiers | |
|---|---|
| ECHA InfoCard | 100.014.239 |
| EC Number |
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PubChem CID
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| UNII | |
CompTox Dashboard (EPA)
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| Properties | |
| Variable | |
| Molar mass | Variable |
| Hazards | |
| GHS labelling: | |
 
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| Warning | |
| H315, H317, H319, H335, H411 | |
| P261, P264, P271, P272, P273, P280, P302+P352, P304+P340, P305+P351+P338, P312, P321, P332+P313, P333+P313, P337+P313, P362, P363, P391, P403+P233, P405, P501 | |
| Flash point | 101 °C (214 °F; 374 K) |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Naphthenic acids (NAs) are mixtures of several cyclopentyl and cyclohexyl carboxylic acids with molecular weights of 120 to well over 700 atomic mass units. The main fractions are carboxylic acids with a carbon backbone of 9 to 20 carbons. McKee et al. claim that "naphthenic acids (NAs) are primarily cycloaliphatic carboxylic acids with 10 to 16 carbons",[1] although acids containing up to 50 carbons have been identified in heavy petroleum.[2]
- ^ Richard H. McKee; Colin M. North; Paula Podhasky; Jeffrey H. Charlap; Adam Kuhl (February 2014). "Acute and Subchronic Mammalian Toxicity of Naphthenic Acids from Oil Sands Tailings". International Journal of Toxicology. 33 (1): 347–355. doi:10.1177/1091581813504229.
- ^ Qian, K. and W.K. Robbins (2001). Resolution and identification of elemental compositions for more than 3000 crude acids in heavy petroleum by negative-ion microelectrospray high-field Fourier Transform ion cyclotron resonance mass spectrometry. Energy & Fuels. 15:1505-1511.