16-Methylheptadecanoic acid
Synonyms
Heptadecanoic acid, 16-methyl-;
Isostearic acid;
Isooctadecanoic acid;
Category
Anionic Surfactant
> Carboxylate
>> Chain Carboxylate
>>> Alkyl Carboxylate
>>>> Branched Alkyl Carboxylate
Chemical Numbering System
CAS: 2724-58-5
EINECS: 220-336-3
Molecular Formula & Molecular Weight
Molecular Formula: C18H36O2
Molecular Weight: 284.48
Structure
Properties
Appearance (1), solid.
Solubility insoluble in water. soluble in toluene, ethyl ether.
Stability stable.
Risk Solid form: flammable material; irritation, irritation to skin, eye, respiratory system. Harmful products of combustion are CO, CO2 and so on. Contact with strong oxidants, can cause to burn.
GHS label: 
Animal Toxicity
Table 1 Animal toxicity values
|
rat oral LD50 |
> 32mL/kg[1] |
Ecology may be hazardous to environment. Water body should be given special attention.
Biodegradability biodegradable.
Characteristics excellent lubricating, cleansing, emulsifying, dispersing, solubilizing abilities. Stability, low temperature performance and resistance to hard water are better than stearic acid. Good resistance to alkali.
Synthesis
Quality Standards & Test Methods
1, Physical and chemical indexes
|
Item |
Physical and chemical indexes |
|
Solid |
|
|
Actives, %, ≥ |
95.0 |
Test Methods
(1), Actives
GB/T 13173 Surface active agents -- Detergents -- Testing methods
GB/T 5173 Surface active agents and detergents -- Determination of anionic-active matter by direct two-phase titration procedure
GB/T 9104 Test methods for industrial stearic acids
ISO 2271 Surface active agents -- Detergents -- Determination of anionic-active matter by manual or mechanical direct two-phase titration procedure
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.
(b), Used in cosmetics, should be test for harmful substances; or furtherly test for microorganisms.
Major Uses
1, Typical applications
Use as lubricant.
Use as cleansing agent.
Use as emulsifying agent, dispersing agent.
2, Household detergents
Use as cleansing agent.
3, Personal care products
Cleansing agent, emulsifying agent, emollient in personal care products.
4, Machinery industry
Lubricant in metal processing, machinery.
Particularly suitable for processing of active metals, such as aluminum, magnesium.
5, Organic synthesis
Used in organic synthesis, for example, preparation of 16-methylheptadecanoic acid esters.
6, Pets
Use as cleansing agent, emulsifying agent.
Manufacturers
References
[1]: ChemIDplus. 2724-58-5, Isooctadecanoic acid
Update: 20180410(1);