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REACH

Fatty acids, hydrogenated tallow, distn. residues

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.

Life Cycle description
Uses advised against

Environmental fate & pathways

Phototransformation in air

Administrative data

Link to relevant study record(s)

Description of key information

The calculated half-lives are in the range of 15.4 hours for octanoic acid (C8) to 5.7 hours for octadecanoic acid (C18).

Key value for chemical safety assessment

Additional information

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).

Aliphatic Acid Structure	CAS Name CAS Number	Photodegradation in air [half-life] (EPI Suite modelled data)
C8	Octanoic acid CAS 124-07-2	15.372 hrs
C9 dicarboxylic	Nonanedioic acid CAS 123-99-9	13.059 hrs
C9	Nonanoic acid CAS 112-05-0	13.15 hrs
C10	Decanoic acid CAS 334-48-5	11.485 hrs
C12	Dodecanoic acid CAS 143-07-7	9.167 hrs
C14	Tetradecanoic acid CAS 544-63-8	7.627 hrs
C16	Hexadecanoic acid CAS 57-10-3	6.530 hrs
C18	Octadecanoic acid CAS 57-11-4	5.710 hrs
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
C22	Docosanoic acid CAS 112-85-6	4.562 hrs
C22, 1 double bond	13-Docosenoic acid, (Z)- CAS 112-86-7	1.446 - 1.581 hrs

Data are cited from OECD SIDS Dossier “Aliphatic Acids Category”, 2009

Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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