What are phosphate esters used for?
Phosphate esters have a multitude of uses including flame retardants, plasticizers, hydraulic fluids, solvents, extraction agents, antifoam agents, and coatings for electronic devices.
What is meant by phosphate ester?
an organic ester of a phosphate such as phosphoric acid with an organic compound such as glucose or sorbitol; see also organophosphorus. adj., adj organophos´phorous.
Is phosphoric acid a surfactant?
Since phosphoric acid (PA) is tribasic, it can form two anionic esters: a dibasic, monoalkyl ester (MAP) and a monobasic dialkyl ester (DAP). Consequently, phosphate esters are stable and active surfactants over a wide pH range and, in water at physiological pH, the MAP and PA can serve as buffers.
How do phosphate esters form?
Phosphate esters including polymers are produced by mixing polyols, such as glycerol, with phosphoric acid material followed by heating under reduced pressure in the presence of inorganic base to temperatures of from about 135° to 165° C.
What is the importance of esters in biochemistry and metabolism?
Esters of pyrophosphoric acid and triphosphoric acid are also important in biochemistry. Esters of these acids are present in every plant and animal cell. They are biochemical intermediates in the transformation of food into usable energy.
What is the importance of esters?
Phosphate esters are biologically important (nucleic acids belong to this group) and are used widely in industry as solvents, plasticizers, flame retardants, gasoline and oil additives, and insecticides. Esters of sulfuric and sulfurous acids are used in the manufacture of dyes and pharmaceuticals.
What is the anionic surfactant?
Anionic surfactants are organic substances. When these surfactants are dissolved in water, negatively charged particles, i.e. anions, are created. These are the active washing component.
What does anionic and nonionic mean?
A non-ionic surfactant has no charge groups in its head. If the charge is negative, the surfactant is more specifically called anionic; if the charge is positive, it is called cationic. If a surfactant contains a head with two oppositely charged groups, it is termed zwitterionic.
Why are esters used as solvents?
Esters are important chemical compounds for various pharmaceutical and agricultural applications. Esters having an acetic acid or vinegar base are called acetates. They are used extensively as solvents, due to their ability to dissolve various greases.
What are four uses for esters?
There are various uses of esters.
- Esters that are have fragrant odours are used as a constituent of perfumes, essential oils, food flavourings, cosmetics, etc.
- Esters are used as an organic solvent.
- Natural esters are found in pheromones.
- Naturally occurring fats and oils are fatty acid esters of glycerol.
What is the difference between anionic and cationic surfactants?
The head of an ionic surfactant carries a net charge. If the charge is negative, the surfactant is more specifically called anionic; if the charge is positive, it is called cationic. If a surfactant contains a head with two oppositely charged groups, it is termed zwitterionic.
Why are anionic surfactants used?
Anionic Surfactants. Anionic surfactants have a negative charge on their hydrophilic end. The negative charge helps the surfactant molecules lift and suspend soils in micelles. Because they are able to attack a broad range of soils, anionic surfactants are used frequently in soaps and detergents.
What is a phosphate ester surfactant?
PHOSPHATE ESTERS Phosphate esters are anionic surfactants which are produced by phosphation of fatty alcohols and ethoxylated aliphatic and aromatic alcohols. Compared to other anionic surfactants, phosphate esters offer specific advantages, including stability over a broad pH range, good solubility and corrosion inhibiting properties.
How do you make phosphate esters?
Phosphate esters are 100% active anionic surfactants which are produced as the free acid by either of two chemical routes. Mixtures of mono- and diesters are produced by reaction of either alcohols, alcohol ethoxylates or phenol ethoxylates with phosphorous pentoxide.
What is PEX surfactant used for?
PEX is a range of phosphate ester anionic surfactants used in agrochemicals, oilfield and in homecare, industrial and institutional products. In agrochemicals PEX phosphate esters provide wetting, emulsifying and dispersing properties that are useful in concentrates, herbicides and pesticide formulation.
What is the purpose of PEX phosphate esters?
In agrochemicals PEX phosphate esters provide wetting, emulsifying and dispersing properties that are useful in concentrates, herbicides and pesticide formulation. In oilfield PEX phosphate esters are primarily used for their corrosion inhibition and load carrying properties.