Linear alkylbenzenesulfonate, sodium salt
Synonyms
LAS-Na;
Benzenesulfonic acid, linear alkyl derivs., sodium salts;
Benzenesulfonic acid, C10-13-alkyl derivs., sodium salts;
Category
Anionic Surfactant
> Sulfonate
>> Aryl Sulfonate
>>> Phenyl Sulfonate
>>>> Linear Alkylphenyl Sulfonate
Chemical Numbering System
CAS: 68411-30-3
EINECS: 270-115-0
Molecular Formula & Molecular Weight
Molecular Formula: N/A
Molecular Weight: N/A
Structure
Properties
Appearance (1), solid.
Solubility soluble in water.
Stability stable.
Risk Solid form: flammable material; irritation, moderate irritation to skin, eye, respiratory. Harmful products of combustion are CO, CO2 and so on. Contact with strong oxidants, can cause to burn.
GHS label: 
Animal Toxicity
Table 1 Animal toxicity values
|
mouse intravenous LD50 |
207mg/kg[1] |
|
mouse oral LD50 |
1575mg/kg[1] |
|
mouse subcutaneous LD50 |
1250mg/kg[1] |
|
rat intravenous LD50 |
119mg/kg[1] |
|
rat oral LD50 |
404mg/kg[1] |
|
rat subcutaneous LD50 |
810mg/kg[1] |
Reproduction: reproductive effect[1].
Ecology may be hazardous to environment. Water body should be given special attention.
Biodegradability biodegradable.
Characteristics excellent cleansing, foaming, emulsifying, wetting, dispersing, solubilizing abilities. Weak resistance to hard water, used in conjunction with chelating agent.
Synthesis
Currently, sulfonation reaction through continuous reactor (such as: falling film reactor) is the most widely used method for preparing sulfonates.
Generally, linear alkylbenzene and sulfur trioxide react through reactor, then sodium hydroxide or sodium carbonate neutralizes, finally obtain product.
US patent 8,921,588 (Process for preparing sulfates and/or sulfonates in a micro-reaction system) presents a synthetic process. Conditions: mole ratio of sulfur trioxide and alkyl benzenes or other raw materials: 1:1; temperature: 30-60°C; reactor: falling film reactor.
Quality Standards & Test Methods
1, Physical and chemical indexes
|
Item |
Physical and chemical indexes |
|
Solid |
|
|
Actives, %, ≥ |
90.0 |
|
pH (25°C, 1%) |
7.0 - 11.5 |
Test Methods
(1), Actives
GB/T 5173 Surface active agents and detergents -- Determination of anionic-active matter by direct two-phase titration procedure
ISO 2271 Surface active agents -- Detergents -- Determination of anionic-active matter by manual or mechanical direct two-phase titration procedure
(2), pH
GB/T 6368 Surface active agents -- Determination of pH of aqueous solution - Potentiometric method
ISO 4316 Surface active agents -- Determination of pH of aqueous solutions -- Potentiometric method
2, Hazardous substances indexes
|
Item |
Hazardous substances indexes |
|
Solid |
|
|
Heavy metals (as Pb), mg/kg, ≤ |
20 |
|
As, mg/kg, ≤ |
3 |
Test Methods
(1), Heavy metals (as Pb)
Safety and Technical Standards for Cosmetics (2015 Edition)
GB/T 30799 The test method of food detergents -- Determination of heavy metals
(2), As
Safety and Technical Standards for Cosmetics (2015 Edition)
GB/T 30797 The test method of food detergents -- Determination of total arsenic
3, Further explanation
(a), On physical and chemical indexes: firstly, shall be indicated carbon atom distribution; secondly, shall be indicated average molecular weight.
(b), Used in cosmetics, should be test for harmful substances; or furtherly test for microorganisms.
Major Uses
1, Typical applications
Use as cleansing agent.
Use as emulsifying agent, dispersing agent.
Use as foaming agent.
2, Household detergents
Use as cleansing agent, foaming agent.
3, Industrial cleaning agents
Use as cleansing agent, emulsifying agent.
4, Emulsion polymerization
Emulsifier, particle size controlling agent in emulsion polymerization.
5, Personal care products
Use as cleansing agent, foaming agent.
6, Pets
Use as cleansing agent, foaming agent.
Manufacturers
References
[1]: ChemIDplus. 68411-30-3, LAS-Na
Update: 20170518(1);