Sulfuric acid, monododecyl ester
Time: 2012-09-07 15:56:16
Sulfuric acid, monododecyl ester
Synonyms
Hydroxy-dodecansulfonic Acid;
Dodecyl Hydrogen Sulfate;
Dodecyl Sulfate;
Lauryl Alcohol Sulfate;
Lauryl Hydrogen Sulfate;
Lauryl Sulfate;
Monododecyl Sulfate;
Sulfuric Acid Monolauryl Ester;
n-Dodecyl Sulfate;
Category
Anionic Surfactant
>> Sulfate
>> Chain Alcohol Sulfate
>> Alkanol Sulfate
>> Linear Alkanol Sulfate
Chemical Numbering System
CASRN151-41-7
EINECS205-791-8
Molecular Formula & Molecular Weight
Molecular Formula: C12H26O4S;C12H26O4S (SciFinder Hill Rules)
Molecular Weight: 266.40
Structure
Properties
Appearance    (1), solid; (2), liquid.
Odor    faint characteristic odor.
Solubility    slightly soluble in water.
Physical - chemical properties
Melting point, °C
25 - 27
Mass
3403
Protein binding energy, KCal/mol
-11
Stability    stable in alkali, weak acid and hard water; unstable in strong acid, hydrolyzed, reduced to alcohol.
Risk    Solid form: corrosion; 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:
Animal Toxicity
Table 1 Animal toxicity values
rat oral LD50
1300mg/kg[2]
Ecology    may be hazardous to environment. Water body should be given special attention.
Biodegradability    biodegradable.
Characteristics    excellent cleansing, foaming, emulsifying, wetting, permeating, dispersing, solubilizing abilities. Resistant to hard water.
Note    (1), Avoid using in children cleaning products, such as shower gels, shampoo, 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, dodecyl alcohol and sulfur trioxide react through reactor, then 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, %, ≥
95 - 99
Unsulfated materials, %, ≤
1.0
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), 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
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. 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
Used in the preparation of anionic surfactants, such as sodium dodecyl sulfate, ammonium dodecyl sulfate and so on.
2. Water Treatment
Use as sorbent.
Manufacturers
 
Update: 20131018(1); 20160809(2);
References
[1]: HSDB. Dodecyl sulfate, 151-41-7
[2]: ChemIDplus. Dodecyl sulfate, 151-41-7
Update: 20131018(1); 20160809(2);