C16-18 Alkyl ethoxylate sulfuric acid, sodium salt
Time: 2013-10-23 21:34:10
C16-18 Alkyl ethoxylate sulfuric acid, sodium salt
Synonyms
Poly(oxy-1,2-ethanediyl), alpha-sulfo-omega-hydroxy-, C16-18-alkyl ethers, sodium salts;
(C16-18)Alcohol ethoxy sulfate sodium salt;
Sodium C16-18 pareth sulfate;
Category
Anionic Surfactant
>> Sulfate
>> Alcohol Polyether Sulfate
>> Alcohol Polyoxyethylene Ether Sulfate
>> Linear Alkanol Polyoxyethylene Ether Sulfate
Chemical Numbering System
CASRN68585-40-0
EINECSN/A
Molecular Formula & Molecular Weight
Molecular Formula: N/A; (C2H4O)n.C16H34O4S.Na - (C2H4O)n.C18H38O4S.Na (SciFinder Hill Rules)
Molecular Weight: N/A
Structure
 
R: C16-18.
Properties
Appearance    (1), solid; (2), paste; (3), liquid.
Odor    faint characteristic odor.
Solubility    slightly soluble to soluble in water. The solubility increases with the increase of EO number.
Stability    stable in alkali, weak acid and hard water; unstable in strong acid, easily hydrolyzes.
Risk    Solid form: irritation, irritation to skin, eye. Under the same hydrophobic base, with the increase of EO number, toxicity and irritation decrease, in general, the EO number is greater than 5, the decline is significantly smaller, tends to flat.
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, solubilizing, foam stabilizing, wetting abilities. Resistant to hard water. Performance is affected by EO number, such as: with the increase of EO number, cleansing capability decreases, solubilization capacity increases. Easily thicken, can provides good viscosity.
Note    (1), 1,4-dioxane generated during preparation: probable carcinogen. However, can be acceptable when concentration of 1,4-dioxane is less than 30ppm or less.
Synthesis
Currently, sulfated reaction through continuous reactor (such as: falling film reactor) is the most widely used method for preparing sulfates.
1. Synthesis of polyether
Obtain by polymerization reaction of C16-18 alkyl alcohol and ethylene oxide.
For further information, see:
US patent 4,223,163 Process for making ethoxylated fatty alcohols with narrow polyethoxy chain distribution; US patent 4,967,017 Alcohol ethoxylates of reduced EO content or residual PO content; US patent 5,069,817 Process for making polyoxyethylene surfactants with desirable low temperature behavior, etc.
2. Synthesis of sulfate
C16-18 alkyl alcohol polyoxyethylene ether and sulfur trioxide react through reactor, then sodium hydroxide 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 polyethers 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
1,4-Dioxane, ppm, ≤
30
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), 1,4-Dioxane
GB/T 26388 Determination of dioxane residues in surfactants - Gas chromatographic method
ISO 17280 Surface active agents -- Determination of 1,4-dioxan residues in surfactants obtained from epoxyethane by gas chromatography
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.
Use as foaming agent, foam stabilizing agent.
Use as solubilizing agent.
2. Household detergents
Main ingredient or auxiliary ingredient for cleansing agent, foaming agent in laundry detergent, hard surface detergent (for example: glass detergent) and other household products.
3. 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.
4. Emulsion polymerization
Emulsifier, particle size controlling agent in emulsion polymerization.
5. Textile, leather
Use as emulsifier, foaming agent, cleansing agent, solubilizing agent.
6. Pets
Main ingredient or auxiliary ingredient for cleansing agent, foaming agent in shampoos and other pet products.
Product members
 
Manufacturers
 
Update: 20161224(1);