What is triethylene glycol?
Triethylene glycol (TEG, CAS 112-27-6) is a widely used hygroscopic solvent and dehydration agent in the chemical and energy industries. It is commonly applied in natural gas dehydration, plasticizers, heat transfer fluids, resins, and industrial solvents.
In industrial practice, pH is typically measured using a water solution of TEG, most commonly a 10% (w/w) aqueous solution.
Typical pH Range
pH (10% aqueous solution, 25°C): 6.0 – 7.5
This indicates that triethylene glycol is near-neutral, neither strongly acidic nor alkaline.
Physical Properties of Triethylene Glycol (TEG)
Triethylene Glycol, also known as Glycerol Triol, is a colorless and odorless liquid with the chemical formula C3H8O3. It is a saturated trihydric alcohol. Similar to water, TEG is a polar molecule, characterized by relatively high surface tension and a large dielectric constant. Because of these features, TEG shares many physical properties with water, such as specific heat capacity and density.
Chemical Properties of Triethylene Glycol (TEG)
While its physical properties resemble those of water, its chemical behavior differs significantly. As an alcohol, TEG contains three hydroxyl groups (-OH), which serve as the main reactive centers. These hydroxyl groups are capable of forming hydrogen bonds similar to those in water. As a result, TEG is an excellent solvent and finds wide application across industries such as pharmaceuticals, chemicals, and food processing.
What is triethylene glycol (CAS 112-27-6) used for?
The main uses of triethylene glycol (CAS 112-27-6) include: as a solvent, plasticizer, antifreeze, surfactant, and raw material for organic synthesis.
- In the chemical industry, TEG can be used as a solvent to dissolve some water-insoluble organic compounds. In the plastics industry, TEG can be used as a plasticizer to improve the flexibility of plastics.
- In the automotive industry, triethylene glycol can be used as an antifreeze to prevent icing in automotive cooling systems.
- In the surfactant industry, triethylene glycol (TEG) can be used as a surfactant to improve product performance.
- In the organic synthesis industry, TEG can be used as a raw material for the preparation of various organic compounds.
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