Dodecylbenzenesulfonic acid, ethanolamine salt
Synonyms
Monoethanolamine dodecylbenzene sulfonate;
Benzenesulfonic acid, dodecyl-, compd. with 2-aminoethanol (1:1);
MEA-dodecylbenzenesulfonate;
Monoethanolamine lauryl benzene sulfonate;
Category
Anionic Surfactant
> Sulfonate
>> Aryl Sulfonate
>>> Phenyl Sulfonate
>>>> Linear Alkylphenyl Sulfonate
Chemical Numbering System
CAS: 26836-07-7
EINECS: 248-024-2
Molecular Formula & Molecular Weight
Molecular Formula: C20H37NO4S; C18H30O3S.C2H7N1O1
Molecular Weight: 387.58
Structure
Properties
Appearance (1), liquid.
Solubility soluble in water.
Stability stable.
Risk Liquid form: irritation, moderate irritation to skin, eye.
GHS label: 
Ecology may be hazardous to environment. Water body should be given special attention.
Biodegradability biodegradable.
Characteristics excellent cleansing, foaming, emulsifying, wetting, dispersing, solubilizing abilities.
Note (1), Do not use in personal care products.
(2), Do not use in nitrosating environment. Reaction of monoethanolamine and nitrous acid can not produce nitrosamines, however, reaction of contained secondary amine of monoethanolamine and nitrous acid can produce nitrosamines. Nitrosamine is a carcinogen.
Synthesis
Currently, sulfonation reaction through continuous reactor (such as: falling film reactor) is the most widely used method for preparing sulfonates.
Generally, dodecylbenzene and sulfur trioxide react through reactor, then monoethanolamine 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 |
|
Actives, %, ≥ |
30.0 - 95.0 |
|
pH (25°C, 1%) |
6.5 - 9.5 |
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 |
|
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.
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.
4, Emulsion polymerization
Emulsifier, particle size controlling agent in emulsion polymerization.
5, Textile
Antistatic agent, cleansing agent in textile.
Manufacturers
Update: 20170515(1);