Ammonium hexadecyl sulfate
Time: 2015-07-20 12:48:22
Ammonium hexadecyl sulfate
Synonyms
Cetyl sulfate ammonium salt;
1-Hexadecanol, hydrogen sulfate, ammonium salt;
Category
Anionic Surfactant
>> Sulfate
>> Chain Alcohol Sulfate
>> Alkanol Sulfate
>> Linear Alkanol Sulfate
Chemical Numbering System
CASRN: 4696-47-3
EINECS: 225-162-1
Molecular Formula & Molecular Weight
Molecular Formula: C16H37NO4S; C16H34O4S.H3N(SciFinder Hill Rules)
Molecular Weight: 339.53
Structure
Properties
Appearance    (1), solid.
Odor    faint characteristic odor.
Solubility    slightly soluble in water.
Stability    pH: 4~7, stable. pH < 4: hydrolyzed, reduced to alcohol. pH > 7: release ammonia. Break down when heated to high temperature for a long time. Stable in hard water.
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 (Rev.6) label:  
Ecology    may be hazardous to environment. Water body should be given special attention.
Biodegradability    biodegradable.
Characteristics    excellent cleansing, foaming, emulsifying, dispersing, wetting, solubilizing abilities. Resistant to hard water. Particularly suitable for preparation of a low pH value (neutral to weakly acidic) products.
Note    (1), Avoid using in children products that can be direct prolonged contact with the skin, such as: skin care products.
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 ammonia water 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
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. 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 dispersing agent, emulsifying agent.
2. Household detergents
Main ingredient or auxiliary ingredient for cleansing agent in laundry detergent and other household products, such as: wool products cleaning agent.
3. Industrial cleaning agents
Use as cleansing agent.
4. Emulsion polymerization
Emulsifier, particle size controlling agent in emulsion polymerization.
5. Pets
Main ingredient or auxiliary ingredient for cleansing agent in shampoos and other pet products.
Manufacturers
 
Update: 20161108(1);