LINEAR ALKYLBENZENE SULFONIC ACID

PRODUCT IDENTIFICATION

CAS NO. 27176-87-0

LINEAR ALKYLBENZENE SULFONIC ACID 

EINECS NO. 248-289-4
FORMULA CH3(CH2)11C6H4SO3H
MOL WT.

326.49

H.S. CODE

3402.11

TOXICITY

Oral rat LD50: 650 mg/kg
SYNONYMS Dodecylbenzene Sulfonic Acid (Strait Chain); LAS; LABSA;
Laurylbenzenesulfonic Acid; Laurylbenzenesulfonate; n-Dodecylbenzene Sulfonic Acid; Alkylbenzene sulphonate, sodium salt; Linear Alkylbenzene Sulphonic Acid; Dodecylbenzolsulfonsäure (German); ácido dodecilbenceno sulfónico (Spanish); Acide dodécylbenzènesulfonique (French);

CLASSIFICATION

Anionic Surfactant

DESCRIPTION OF LAS

Linear alkylbenzene sulfonic acid is the largest-volume synthetic surfactant because of its relatively low cost, good performance, the fact that it can be dried to a stable powder and the biodegradable environmental friendliness as it has straight chain. LAS is an anionic surfactants with molecules characterized by a hydrophobic and a hydrophilic group. Alpha-olefin sulfonates (AOS) alkyl sulfates (AS) are also examples of commercial anionic surfactants. They are nonvolatile compounds produced by sulfonation. LAS are complex mixtures of homologues of different alkyl chain lengths (C10 to C13 or C14) and phenyl positional isomers of  2 to 5-phenyl in proportions dictated by the starting materials and reaction conditions, each containing an aromatic ring sulfonated at the para position and attached to a linear alkyl chain at any position with the exception of terminal one (1-phenyl). The properties of LAS differ in physical and chemical properties according to the alkyl chain length, resulting in formulations for various applications. The starting material LAB (linear alkylbenzene) is produced by the alkylation of benzene with n-paraffins in the presence of hydrogen fluoride (HF) or aluminium chloride (AlCl3) as a catalyst.  LAS is produced by the sulfonation of LAB with oleum in batch reactors. Other sulfonation alternative reagents are sulfuric acid, diluted sulfur trioxide, chlorosulfonic acid and sulfamic acid on falling film reactors. LAS are then neutralized to the desired salt (sodium, ammonium, calcium, potassium, and triethanolamine salts). Surfactants are widely used in the industry needed to improve contact between polar and non-polar media such as between oil and water or between water and minerals. Linear alkylbenzene sulfonic acid is mainly used to produce household detergents including laundry powders, laundry liquids, dishwashing liquids and other household cleaners as well as in numerous industrial applications like as a coupling agent and as an emulsifier for agricultural herbicides and in emulsion polymerization.

PHYSICAL AND CHEMICAL PROPERTIES

PHYSICAL STATE

brown liquid

MELTING POINT 10 C
BOILING POINT 315 C
SPECIFIC GRAVITY

1.2

SOLUBILITY IN WATER

partially soluble

pH  
VAPOR PRESSURE  

REFRACTIVE INDEX

 

NFPA RATINGS

Health: 2 ; Flammability: 0; Reactivity : 0

AUTOIGNITION

 

FLASH POINT

149 C

STABILITY Stable under ordinary conditions

APPLICATIONS

Household detergents including laundry powders, laundry liquids, dishwashing liquids and other household cleaners. Industrial applications of wetting agent, emulsifier for agricultural herbicides and in polymerization.

SALES SPECIFICATION

APPEARANCE

Brown liquid

ACTIVE MATTER

96.0% min

ACID VALUE

180 - 190

FREE OIL

1.5% max

WATER

1.0% max

COLOR, KLETTE

70 max (5% Sol. pH=7, 40mm cell)

FREE SULFURIC ACID

1.5% max

TRANSPORTATION
PACKING 210 kgs in drum
HAZARD CLASS

8 (Packing group: III)

UN NO.

2586

LAS HOMOLOGUES AND SALTS

PARENT SULFONIC ACID

SALTS

CHAIN LENGTH

CAS RN

CAS RN

Dodecylbenzene sulfonic acid 1322-98-1 1322-98-1 (Sodium)
Undecylbenzene sulfonic acid 50854-94-9 27636-75-5 (Sodium)
61931-75-7 (Ammonium)
Linear Alkylbenzene sulfonic acid 27176-87-0 25155-30-0 (Sodium)
29756-98-7 (Aluminium)
1331-61-9 (Ammonium)
26264-06-2 (Calcium)
27177-77-1 (Potassium)
Tridecylbenzene sulfonic acid 25496-01-9 26248-24-8 (Sodium)
Tetradecylbenzene sulfonic acid 30776-59-1 28348-61-0 (Sodium)
Pentadecylbenzene sulfonic acid 61215-89-2 64716-02-5 (Potassium)
Hexadecylbenzene sulfonic acid 16722-32-0 64716-00-3 (Potassium)
Heptadecylbenzene sulfonic acid 39735-13-2

 

PRICE INFORMATION

 

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