TEG/TRIETHYLENE GLYCOL
Triethylene glycol is a colorless liquid with a slight, sweet odor. It properties closely resemble those of diethylene glycol. In many instances, the applications for diethylene glycol and triethylene glycol overlap. Because triethylene glycol has a higher boiling point, it may be used in preference to diethylene glycol when a less volativle compound is required.
Because it has two ether and two hydroxyl groups, TEG is a good solvent for nitrocellulose as well as for various gums and resins. It is miscible with water and many organic solvents. TEG is a solvent used in the formulation of steam-set printing inks.
TEG is an efficient hygroscopic agent. This property makes it useful as a liquid desiccant for removing water from natural gas, thus preventing the formation of hydrates in long distance transmissions lines. TEG is also used as dessicant in small packaged plants located at the gas well head in order to eliminate the need of line heaters in field gathering systems.
In air conditioning systems designed for dehumidifying air, TEG allows for the removal of water vapor without cooling the air.
This offers advantages particularly in commercial installations where comfort cooling is not required. When vaporized under proper conditions in specially designed vaporizing devices for air sanitation, the air-treatment grade of TEG aids in the control of bacteria and virus content of air.
In the tobacco industry, it is standard practice to treat the tobacco industry, it is standard practice to treat the tobacco with humectants such as TEG or propylene glycol so that the tobacco reaches the consumer in proper condition.
TEG is also used n the plasticization of composition cork and serves as a solvent for resin impregnants and other additives.
TEG gives increased pliability to various plastics, particularly cellulose derivatives. it aids in the retention of flexibility, even in dry atmospheres. Ester derivatives of TEG are important plasticizer for polyvinyl butyral resins, nitrocellulose lacquers, vinyl and polyvinyl chloride resins, and polyvinyl acetate. Other ester derivatives are plasticizers for synthetic rubber compounds or for cellulose esters.
TEG is used in the manufacture of alkyd type resins useful as laminating agents and in adhesives. Polyesters derived from TEG are useful in various applications-some as plasticizers and others as low pressure laminates for glass fibers, asbestos, cloth or paper.
Besides being useful as plasticizers, the fatty acid derivatives of TEG are used as emulsifiers, demulsifiers and lubricants.
Mitures of TEG and water exhibit selective solvent properties for the separation of aromatic hydrocarbons from mixtures containing paraffinic hyddrovarbons. Like diglycol, TEG is used commercially to recover high purity aromatic fractions from mixtures of light oil fractions.
Special inhibited grades of TEG are available for use as heat transfer fluids, particularly in hight temperature application.
A special high purity grade of TEG is available for use in celllophane and paper that may come in contact with food.
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