Monooctyl Phosphate
Synonyms
Monooctyl phosphoric acid;
Octyl dihydrogen phosphate;
Octy lphosphate;
Phosphoric acid, monooctyl ester;
Octyl dihydrogen phosphate;
Category
Anionic Surfactant
> Phosphate
>> Chain Phosphate
>>> Alkyl Phosphate
>>>> Linear Alkyl Phosphate
Chemical Numbering System
CAS: 3991-73-9
EINECS: 223-638-3
Molecular Formula & Molecular Weight
Molecular Formula: C8H19O4P
Molecular Weight: 210.21
Structure
Properties
Appearance (1), colorless to slightly yellow liquid.
Solubility slightly soluble in water; soluble in ethanol.
Stability stable. Under strong acid condition, easily hydrolyzed.
Risk Liquid form: irritation, irritation to skin, eye.
GHS label: 
Animal Toxicity
Table 1 Animal toxicity values
|
rat oral LD |
> 250mg/kg[1] |
Ecology may be hazardous to environment. Water body should be given special attention.
Biodegradability biodegradable.
Characteristics excellent emulsifying, dispersing, anticorrosive, antirust, lubricating, cleansing, solubilizing, antistatic, wetting abilities. Low to moderate foaming. Resistance to high concentration of alkali. Intolerance to hard water.
Synthesis
Obtained that octyl alcohol reacts with polyphosphoric acid (or phosphorus pentoxide).
Quality Standards & Test Methods
1, Physical and chemical indexes
|
Item |
Physical and chemical indexes |
|
Liquid |
|
|
Actives, %, ≥ |
90.0 |
Test Methods
(1), Actives
GB/T 13173 Surface active agents -- Detergents -- Testing methods
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, Product standards
(1), Chinese standards
(1a), QB/T 2949 Phosphoric acid ester
4, 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 emulsifying agent, dispersing agent.
Use as anticorrosive agent, antirust agent.
Use as cleansing agent.
2, Machinery
Lubricant, corrosion inhibitor, antirust agent in metalworking fluids.
3, Household detergents
Cleansing agent in household cleaning products.
4, Industrial cleaning agents
Cleansing agent, dispersing agent, antirust agent in industrial cleaning.
5, Textile
Wetting agent, permeating agent in textile.
6, Polymer
Internal lubricant, antistatic agent in resins.
7, Paper
Deinking agent in paper.
Manufacturers
References
[1]: ChemIDplus. 3991-73-9, Monooctyl phosphate
Update: 20140330(1); 20190303(2);