Triethylene Glycol (TEG)

Triethylene Glycol (TEG) is a colorless, odorless, and hygroscopic organic compound with the chemical formula C6H14O4. Like diethylene glycol (DEG), it belongs to the family of glycols, which are diols containing multiple hydroxyl groups. TEG is closely related to diethylene glycol, but it has an additional ethylene glycol unit, resulting in a larger molecule.

Key characteristics and uses of Triethylene Glycol (TEG):

Hygroscopic Properties: TEG shares the same hygroscopic properties as DEG, meaning it has a strong affinity for absorbing moisture from the surrounding air. This makes it useful as a desiccant and dehumidifying agent in various industrial processes.

Dehydrating Agent: Due to its hygroscopic nature, TEG is used to remove water from natural gas and other gases in industrial applications. It acts as a dehydrating agent to reduce the water content, preventing corrosion and other issues in gas pipelines and processing units

Safety and Toxicity:

While triethylene glycol is generally considered safe for its intended industrial uses, it is essential to handle it with proper safety precautions. As with other glycols, TEG can be harmful if ingested, inhaled, or comes into contact with the skin. Care should be taken to prevent exposure and to follow established safety guidelines when working with TEG.

Overall, Triethylene Glycol is a versatile chemical with various industrial applications, particularly in the fields of gas dehydration, solvent use, and as an antifreeze and coolant. Proper handling and safety measures should always be observed to ensure safe and effective use.

Gas Dehydration: One of the primary uses of TEG is in gas dehydration processes. It is commonly employed to remove moisture from natural gas streams and other gases. TEG acts as a dehydrating agent, absorbing water vapor from the gas, and leaving behind dry gas. This is crucial in preventing corrosion, hydrate formation, and other operational issues in gas pipelines and processing units.
Solvent: TEG serves as an effective solvent in various industrial processes. It is utilized to dissolve a wide range of organic and inorganic compounds. Industries such as printing (for inks and dyes), coatings, and resins utilize TEG as a solvent in their manufacturing processes.
Chemical Intermediary: TEG is a valuable intermediate in the production of other chemicals and products. It is used to synthesize plasticizers, which are additives that improve the flexibility and performance of plastics. TEG is also involved in the production of polyesters and polyurethanes, which have widespread applications in textiles, packaging, foams, and more.
Antifreeze and Coolant: Like its close relative diethylene glycol (DEG), TEG is used as an antifreeze and coolant. It is added to various industrial and automotive systems to prevent freezing and to provide protection against corrosion. This application is crucial in cold environments and in preventing damage caused by freezing temperatures.
Dehumidifying Agent: Due to its hygroscopic nature, TEG is utilized as a desiccant and dehumidifying agent. It can help control moisture levels in enclosed spaces and prevent moisture-related damage to sensitive equipment and products.
Pharmaceutical Industry: TEG is used in the pharmaceutical industry as an excipient in some formulations. It helps to stabilize certain medications and contributes to their shelf life.
Air Conditioning and HVAC Systems: TEG finds application in air conditioning and HVAC systems as a coolant and for moisture control. It helps improve the efficiency of cooling systems and maintains stable humidity levels.

Characteristic	Test Method	Unit	Value
PURITY	ASTM E -202	WT.%	97 MIN.
MEG CONTENT	ASTM E -202	WT.%	2 MAX.
TEG CONTENT (T.TEG)	ASTM E -202	WT.%	1 MAX.
WATER	ASTM E -203	WT.%	0.05 MAX.
COLOR	ASTM D -1209	Pt-Co	25 MAX.
ACIDITY AS ACETIC ACID	ASTM D -1613	WT.%	0.01 MAX.
ASH	DC-254/A	PPM	50 MAX.
SP. GR (20/20 °C)	ASTM D- 891	–	1.124 – 1.126
DISTILLATION @ 760 MM-Hg
5-95 VOL % RANGE	ASTM D-1078	°C	280-295