Sodium C16-18 olefin sulfonate
Time: 2013-05-30 01:36:42
Sodium C16-18 olefin sulfonate
Synonyms
Sodium C16-18 Alpha Olefin Sulfonate;
Sulfonic acids, C16-18-alkane hydroxy and C16-18-alkene, sodium salts;
AOS;
Category
Anionic Surfactant
>> Sulfonate
>> Chain Sulfonate
>> Alkenyl Sulfonate
>> Linear Alkenyl Sulfonate
Chemical Numbering System
CASRN91722-28-0
EINECS294-430-8
Molecular Formula & Molecular Weight
Molecular Formula: C16H31NaO3S / C16H33NaO4S - C18H35NaO3S / C18H37NaO4S; C16H32O3S.Na / C16H34O4S.Na - C18H36O3S.Na / C18H38O4S.Na
Molecular Weight: 326.47 - 372.54
Structure
Olefin sulfonate (main ingredient):
n=0, 1, 2 mainly;
Hydroxy alkyl sulfonate:
n=2, 3 mainly;
Disulphonate:
In the film sulfonation process, content of olefin sulfonate is the highest, content of hydroxy alkyl sulfonate is secondary, content of disulphonate is the lowest.
Properties
Appearance    (1), white to pale yellow powder; (2), liquid.
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 (Rev.6) label:  
Liquid form: irritation, moderate irritation to skin, eye.
GHS (Rev.6) label:
Generally, irritation is lower than the corresponding carbon chain alkylbenzene sulfonate.
Ecology    may be hazardous to environment. Water body should be given special attention.
Biodegradability    biodegradable.
Characteristics    excellent foaming, cleansing, emulsifying, wetting, permeating, dispersing, solubilizing abilities. Resistant to hard water. Tolerance to acid.
Note    (1), Avoid using in children products, such as shower gels, shampoo, skin care products, and so on.
Synthesis
Currently, sulfonated reaction through continuous reactor (such as: falling film reactor) is the most widely used method for preparing alpha olefin sulfonate.
Generally, C16-18 alpha olefins and sulfur trioxide react through reactor, then sodium hydroxide or sodium carbonate neutralizes, finally obtain product.
For further information, see:
United States Patent 4,248,793 Process for the production of internal olefin sulfonate,
United States Patent 4,183,867 Method for preparation of internal olefin sulfonate,
United States Patent 4,139,498 Process of manufacturing high-concentration olefin sulfonate solution,
United States Patent 9,221,750 Process for preparing an internal olefin sulfonate,
United States Patent 9,249,092 Isomerized alpha olefin sulfonate and method of making the same,
United States Patent 8,993,798 Isomerized alpha olefin sulfonate and method of making the same,
United States Patent 8,299,289 Isomerized alpha olefin sulfonate and method of making the same,
United States Patent 8,283,491 Isomerized alpha olefin sulfonate and method of making the same, and so on.
Quality Standards & Test Methods
1. Physical and chemical indexes
Item
Physical and chemical indexes
Liquid
Solid
Actives, %, ≥
35.0 - 50.0
85.0
Unsulfonated materials, %, ≤
5.0
5.0
pH (25°C, 1% solution)
7.5 - 11.0
7.5 - 11.0
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), Unsulfonated materials
GB/T 11989 Anionic surface active agents - Determination of soluble matter content in light petroleum
ISO 894 Surface active agents -- Technical sodium primary alkylsulphates -- Methods of analysis
(3), 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
Liquid
Heavy metals (as Pb), mg/Kg, ≤
20
20
As, mg/Kg, ≤
3
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. Product standards
(1), Chinese standards
(1a), GB/T 20200 Sodium alpha-olefin sulfonate
4. 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 foaming agent.
Use as cleansing agent.
Use as emulsifying agent, dispersing agent.
2. Personal care products
Cleansing agent, foaming agent in personal care products.
Can provide excellent flash foam.
3. Household detergents
Main ingredient or auxiliary ingredient for cleansing agent, foaming agent in laundry detergent and other household products.
4. Industrial cleaning agents
Main ingredient or auxiliary ingredient for cleansing agent, foaming agent in car cleaning products, metal cleaning products and other industrial cleaning products.
Particularly, suitable for the preparation of high bubble detergents, for example, car cleaning agents.
5. Fire extinguishing agent
Use as foaming agent.
6. Emulsion polymerization
Emulsifier, particle size controlling agent in emulsion polymerization.
Can provide excellent thermal and hydrolytic stabilities.
7. Petroleum
Use as foaming agent, agent for oil recovery.
8. Pets
Main ingredient or auxiliary ingredient for cleansing agent, foaming agent in shampoos and other pet products.
Manufacturers
 
Update: 20131027(1); 20170626(2);