LINEAR ALKYLBENZENE SULFONATE (LAS) - UNEP Chemicals

OECD SIDS LINEAR ALKYLBENZENE SULFONATE (LAS)
1. GENERAL INFORMATION
1.01 SUBSTANCE INFORMATION
A. CAS number The information provided in this dossier refers to various individual
compounds and mixtures of sulfonated linear alkyl benzenes which are
identified by the following CAS numbers and names:
CAS No. EINECS No. Name
1322-98-1 215-347-5 Decylbenzene sulfonic acid, sodium salt
25155-30-0 246-680-4 Dodecylbenzene sulfonic acid, sodium salt
26248-24-8 247-536-3 Tridecylbenzene sulfonic acid, sodium salt
27636-75-5 248-583-2 Undecylbenzene sulfonic acid, sodium salt
68081-81-2 268-356-1 C10-16 Monoalkylbenzene sulfonic acid, sodium salt
68411-30-3 270-115-0 C10-13 Alkylbenzene sulfonic acid, sodium salt
69669-44-9 274-070-8 C10-14 Alkyl derivatives benzene sulfonic acid, sodium salt
85117-50-6 285-600-2 C10-14 Monoalkylbenzene sulfonic acid, sodium salt
90194-45-9 290-656-6 C10-13 Alkyl derivatives benzene sulfonic acid, sodium salt
127184-52-5 4-C10-13-sec Alkyl derivatives benzene sulfonic acid, sodium salt
B. Name (IUPAC name) See A.
C. Name (OECD name) Linear alkylbenzene sulfonate (LAS)
D. CAS Descriptor
E. EINECS-Number See A.
F. Molecular Formula See G.
G. Structural Formula
Relatively consistent mixture of homologues with predominately linear
(currently >95% for most products) varying alkyl chain lengths (from C10 to
C14) and phenyl isomers with attachment of the para sulfonate (sodium salt)
benzene ring to the alkyl chain at non-terminal positions. This description
applies to all of the CAS numbers listed in 1.01A as shown by the alkyl
chain distribution in the table in 1.01G.
CH 3 (CH 2 ) x CH(CH 2 ) y CH 3
S0 - Na +
3
where x+y=n and n=7-11
carbon units
The linear alkyl carbon chain typically has 10 to 14 carbon units, with the approximate mole ratio varying
somewhat regionally, as shown in the following table:
UNEP PUBLICATIONS 110