DEA-cetyl sulfate
Synonyms
Diethanolamine cetyl sulfate;
1-Hexadecanol, hydrogen sulfate, compd. with 2,2'-iminobis(ethanol) (1:1);
Bis(2-hydroxyethyl)ammonium hexadecyl sulphate;
Category
Anionic Surfactant
> Sulfate
>> Chain Alcohol Sulfate
>>> Alkanol Sulfate
>>>> Linear Alkanol Sulfate
Chemical Numbering System
CAS: 51541-51-6
EINECS: 257-260-5
Molecular Formula & Molecular Weight
Molecular Formula: C20H45NO6S; C16H34O4S.C4H11N1O2
Molecular Weight: 427.64
Structure
Properties
Appearance (1), solid; (2), liquid.
Solubility soluble in water.
Stability stable in alkali, weak acid and hard water; unstable in strong acid, hydrolyzed, reduced to alcohol.
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: 
Ecology may be hazardous to environment. Water body should be given special attention.
Biodegradability biodegradable.
Characteristics excellent cleansing, foaming, emulsifying, dispersing, solubilizing abilities. Resistant to hard water.
Note (1), Do not use in personal care products.
(2), Do not use in nitrosating environment. Reaction of diethanolamine and nitrous acid can produce nitrosamines. Nitrosamine is a carcinogen.
Synthesis
Currently, sulfated reaction through continuous reactor (such as: falling film reactor) is the most widely used method for preparing sulfates.
Generally, cetyl alcohol and sulfur trioxide react through reactor, then diethanolamine 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 alcohols 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% solution) |
6.5 - 10.5 |
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.
Major Uses
1, Typical applications
Use as cleansing agent.
Use as emulsifying agent, dispersing agent.
2, Industrial cleaning agents
Use as cleansing agent.
Manufacturers
Update: 20131018(1); 20161028(2);