Sodium methyl 2-sulfopalmitate
Synonyms
Sodium methyl 2-sulfonatohexadecanoate;
Sodium 1-methyl 2-sulfopalmitate;
MES;
Category
Anionic Surfactant
> Sulfonate
>> Ester Sulfonate
>>> Fatty Acid Methyl Ester Sulfonate
>>>> Linear Alkyl Fatty Acid Methyl Ester Sulfonate
Chemical Numbering System
CAS: N/A
EINECS: N/A
Molecular Formula & Molecular Weight
Molecular Formula: C17H33NaO5S; C17H34O5S.Na
Molecular Weight: 372.50
Structure
Properties
Appearance (1), white to yellow powder or flaky solid.
Solubility soluble in water.
Stability stable in weak acid, weak alkali, hard water. Under strong acid or strong alkali, easily hydrolyze.
Risk Solid form: flammable material; irritation, low irritation to skin, eye. 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, wetting, solubilizing, permeating abilities. Mild. Good lime soap dispersing power. Foaming, cleansing capacities are higher than the corresponding sodium alkylbenzenesulfonate in hard water. In laundry detergent, the third representative surface active agent is used instead of alkylbenzene sulfonate (LAS). Suitable for neutral formula system.
Ingredients description (1), Disodium 2-sulfopalmitate should be strictly controlled in order to avoid affecting product quality.
Note (1), Be careful to use in children washing products, such as shampoo, bath liquid and so on.
Synthesis
In film reactor (for example: falling film reactor), methyl palmitate reacts with sulphur trioxide, then age, bleach, neutralize, finally obtain.
For further information, see:
United States Patent 5,587,500 Sulfonation of fatty acid esters,
United States Patent 5,475,134 Process for making sulfonated fatty acid alkyl ester surfactant,
United States Patent 5,429,773 Process to improve alkyl ester sulfonate surfactant compositions, and so on.
Quality Standards & Test Methods
1, Physical and chemical indexes
|
Item |
Physical and chemical indexes |
|
Solid |
|
|
Actives, %, ≥ |
20.0 - 40.0 |
|
Soluble materials in petroleum ether, %, ≤ |
2.5 - 4.0 |
|
pH (25°C, 1%) |
4.5 - 7.0 |
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), Soluble materials in petroleum ether
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 |
|
|
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, Product standards
(1), Chinese standards
(1a), QB/T 4081 Sodium fatty acid methyl ester 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 cleansing agent.
Use as foaming agent.
Use as emulsifying agent, dispersing agent.
Use as a substitute for sodium alkylbenzenesulfonate (LAS).
2, Household detergents
Main ingredient or auxiliary ingredient for cleansing agent, foaming agent in laundry detergent, household hard surface cleaning agent and other household products.
The most widespread use.
3, Food industry related products
Use as cleansing agent. For example: dishwashing detergent.
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.
5, Textile, leather
Use as emulsifier, cleansing agent.
6, Ore-dressing
Use as foaming agent, floating agent.
7, Personal care products
Use as cleansing agent.
Manufacturers
Update: 20131028(1); 20170821(2);