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EC number: 274-307-5 | CAS number: 70084-85-4 The complex residuum produced by the distillation of tallow fatty acids. It contains primarily glycerides, C16-20 saturated fatty acids, C36 dimer acid, C54 trimer acid and heavier polymeric acids.
The calculated half-lives are in the range of 15.4 hours for octanoic acid (C8) to 5.7 hours for octadecanoic acid (C18).
No experimental data on photolysis in air is available for fatty acids.
However comprehensive modeled data are provided in the OECD SIDS (2009) for aliphatic fatty acids of C8-C22 carbon chain length.In the EPI Suite model a hydroxyl radical reaction of 1.5 * 106cm3hydroxyl radical concentration at 25 °C is assumed.The data show a decreasing photodegradation half-life with increasing chain length.Unsaturated fatty acids undergo photolysis faster than saturated. The half-life declines with the number of double bounds.The calculated half-lives are in the range of 15.4 hours for octanoic acid (C8) to 5.7 hours for octadecanoic acid (C18).
CAS NameCAS Number
Photodegradation in air [half-life](EPI Suite modelled data)
Octanoic acidCAS 124-07-2
Nonanedioic acidCAS 123-99-9
Nonanoic acidCAS 112-05-0
Decanoic acid CAS 334-48-5
Dodecanoic acidCAS 143-07-7
Tetradecanoic acid CAS 544-63-8
Hexadecanoic acidCAS 57-10-3
Octadecanoic acidCAS 57-11-4
C18, 1 double bond
9-Octadecenoic acid, (Z)CAS 112-80-1
1.544 - 1.699 hrs
C18, 2 double bonds
9,12-Octadeca- dienoic acid, (Z,Z)CAS 60-33-3
0.892 - 0.998 hrs
Docosanoic acidCAS 112-85-6
C22, 1 doublebond
13-Docosenoic acid, (Z)-CAS 112-86-7
1.446 - 1.581 hrs
Data are cited from OECD SIDS Dossier “Aliphatic Acids Category”, 2009
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