Sulfuric Acid, Mono-C10-16-alkyl Esters, Magnesium Salts
Synonyms
C10-C16 Alkyl alcohol sulfuric acid magnesium salt;
Magnesium C10-16 alkyl sulfate;
Category
Anionic Surfactant
> Sulfate
>> Chain Alcohol Sulfate
>>> Alkanol Sulfate
>>>> Linear Alkanol Sulfate
Chemical Numbering System
CAS: 68081-97-0
EINECS: 268-365-0
Molecular Formula & Molecular Weight
Molecular Formula: C20H42MgO8S2 – C32H66MgO8S2; C20H44O8S2.Mg - C32H68MgO8S2
Molecular Weight: 498.98 – 667.30
Structure
R: C10-16.
Properties
Appearance (1), slightly yellow liquid; (2), solid powder.
Odor faint characteristic odor.
Solubility soluble in water.
Hygroscopicity Solid magnesium C10-16 alkyl sulfate: hygroscopic.
Physical - chemical properties
|
Flash point, °C |
> 93 |
Stability stable in alkali, weak acid and hard water; unstable in strong acid, hydrolyzed, reduced to alcohol.
Risk Solid form: flammable material; irritation, 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: 
Liquid form: irritation, irritation to skin, eye.
GHS label:
Ecology may be hazardous to environment. Water body should be given special attention.
Biodegradability biodegradable.
Characteristics excellent cleansing, foaming, emulsifying, wetting, permeating, dispersing, solubilizing, antistatic abilities. Mild. Resistant to hard water. Strongly resistant to electrolyte.
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, C10-16 alkyl alcohol and sulfur trioxide react through reactor, then magnesium 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 alcohols or other raw materials: 1:1; temperature: 30-60°C; reactor: falling film reactor.
US patent 6,455,488 (Process of making alkyl sulfate granulates) describes the preparation of a particulate alkyl sulfate, but does not involve the synthesis process.
US patent US 6,331,645 (Process for preparing powdery alkyl sulfates) describes the preparation of a powdery alkyl sulfate, but does not involve the synthesis process.
Quality Standards & Test Methods
1, Physical and chemical indexes
|
Item |
Physical and chemical indexes |
|
Liquid |
|
|
Actives, %, ≥ |
25-30 |
|
Unsulfated materials, %, ≤ |
2.5 |
|
MgSO4, %, ≤ |
0.75 |
|
MgCl2, %, ≤ |
0.3 |
|
pH (25°C, 10% solution) |
6.5-7.5 |
|
Color, Gardner, ≤ |
2 |
|
Density, g/mL, approx. |
1.02 |
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), Unsulfated 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), MgSO4
GB/T 15963 Sodium lauryl sulfate, magnesium sulfate calculated.
ISO 894 Surface active agents -- Technical sodium primary alkylsulphates -- Methods of analysis
(4), MgCl2
GB/T 15963 Sodium lauryl sulfate, magnesium chloride calculated.
ISO 894 Surface active agents -- Technical sodium primary alkylsulphates -- Methods of analysis
(5), 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
(6), Color (Gardner)
GB/T 22295 Standard test method for color of transparent liquids (Gardner Color Scale)
ISO 4630 Clear liquids -- Estimation of colour by the Gardner colour scale
(7), Density
GB/T 4472 Determination of density and relative density for chemical products
ISO 758 Liquid chemical products for industrial use -- Determination of density at 20 degrees C
2, Hazardous substances indexes
|
Item |
Hazardous substances indexes |
|
Liquid |
|
|
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.
(b), Generally, magnesium C10-16 alkyl sulfate and magnesium lauryl sulfate replace to use each other.
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.
For example, main ingredient or auxiliary ingredient for cleansing agent, foaming agent in shampoo, hand sanitizer, bubble bath, bath soap and other products.
3, Household detergents
Main ingredient or auxiliary ingredient for cleansing agent, foaming agent in dishwasher cleaning agent, carpet cleaning agent and other household products.
4, Industrial cleaning agents
Main ingredient or auxiliary ingredient for cleansing agent, foaming agent.
5, Pets
Main ingredient or auxiliary ingredient for cleansing agent, foaming agent in shampoos and other pet products.
6, Emulsion polymerization
Emulsifier, particle size controlling agent in emulsion polymerization. For example, polyvinyl chloride emulsion polymerization.
7, Textile, leather
Use as emulsifier, foaming agent, cleansing agent, wetting agent, antistatic agent, solubilizing agent.
8, Disinfectant
Use as foaming agent, retention agent.
Manufacturers
Update: 20131018(1); 20160728(2);