The types of phosphate ester mainly include the following:
Primary phosphate ester (monophosphate): This is the product of the first hydroxyl group of phosphoric acid being replaced by a hydrocarbon group, usually called hydrocarbon phosphoric acid.
Secondary phosphate ester (diester): This is the product of the second hydroxyl group of phosphoric acid being replaced by a hydrocarbon group.
Tertiary phosphate ester (triester): This is the product of the third hydroxyl group of phosphoric acid being replaced by a hydrocarbon group.
In addition, there are other types of phosphate esters:
Pyrophosphate ester: This is the product of two hydroxyl groups in the phosphoric acid molecule being replaced by hydrocarbon groups.
Monophosphate ester: This is the product of one hydroxyl group of phosphoric acid being replaced by a hydrocarbon group.
Polyphosphate ester: This is the product of multiple hydroxyl groups of phosphoric acid being replaced by hydrocarbon groups.
Polyphosphate ester: This is an ester formed by the polymerization of multiple phosphoric acid molecules.
Phosphite ester: This is an ester derivative of phosphorous acid.
Hydroxylphosphate ester: This is a phosphate ester containing two phosphorus oxygen bonds.
Hypophosphites : These are ester derivatives of hypophosphorous acid .
These phosphate esters have a wide range of applications in industry and scientific research, such as as surfactants, emulsifiers, antistatic agents, plasticizers and defoaming agents, etc.