Description
Triethylene Glycol (TEG) is a high-purity polyether diol with the molecular formula HOCH₂CH₂OCH₂CH₂OCH₂CH₂OH (C₆H₁₄O₄, CAS 112-27-6). This colorless, odorless, viscous liquid is characterized by its exceptional hygroscopic properties, high boiling point (288°C), and low vapor pressure, making it the industry-standard liquid desiccant for natural gas dehydration. TEG belongs to the polyethylene glycol family and features both ether linkages and terminal hydroxyl groups, providing unique solvency characteristics and chemical versatility. Its excellent thermal stability, low volatility, and ability to be continuously regenerated make TEG highly cost-effective in cyclic dehydration processes. Beyond gas processing, TEG serves as a plasticizer, solvent, humectant, and chemical intermediate across diverse industrial applications. The compound exhibits low toxicity, complete water miscibility, and documented antimicrobial activity when aerosolized, contributing to its widespread use in air sanitization products and HVAC humidity control systems.
- Superior Hygroscopic Properties: Exceptional water absorption capacity makes TEG the preferred liquid desiccant for natural gas dehydration and humidity control applications.
- High Thermal Stability: Elevated boiling point (288°C) and low vapor pressure (<0.01 mmHg @ 20°C) ensure minimal losses during high-temperature regeneration cycles.
- Excellent Regenerability: Can be continuously recycled through heating and condensation, providing economical long-term operation in dehydration systems.
- Broad Chemical Compatibility: Miscible with water and most polar solvents; compatible with common steels, stainless steel, and aluminum when kept anhydrous.
Applications
Natural Gas Dehydration · CO₂ Dehydration · H₂S Dehydration · Gas Processing · Pipeline Moisture Control · HVAC Humidity Control · Air Conditioning Dehumidification · Air Sanitization Products · Plasticizer for Vinyl Polymers · Unsaturated Polyester Resin Production · Heat Transfer Fluids · Hydraulic Fluid Additive · Brake Fluid Formulations · Antifreeze Blends · Lubricant Formulations · Emulsifier Production · Solvent Applications · Equipment Cleaning · Printing Inks · Smoke/Fog Machine Fluids · Humectant · Chemical Intermediate · Polyester Resins · Specialty Chemical Manufacturing
Benefits
Exceptional Moisture Absorption · High Boiling Point · Low Vapor Pressure · Excellent Regenerability · Low Volatility Losses · Complete Water Miscibility · Good Thermal Stability · Low Toxicity Profile · Antimicrobial Properties · Broad Solvent Compatibility · Cost-Effective Operation · Continuous Reuse Capability · Consistent Quality · Multiple Packaging Options · Domestic Availability
Product Availability
Drum · IBC Tote · Flexi Bag · ISO Tank · Bulk Tank Truck
Product Data
| Property | Test Method | Value |
| Appearance | Visual | Clear, Colorless Liquid |
| Odor | — | Mild / Essentially Odorless |
| Chemical Name | — | 2,2′-[1,2-Ethanediylbis(oxy)]bis-ethanol |
| CAS Number | — | 112-27-6 |
| Molecular Formula | — | C₆H₁₄O₄ |
| Molecular Weight | — | 150.17 g/mol |
| Purity | — | 99% minimum (typical) |
| pH | — | ~7 (neutral) |
| Specific Gravity @ 20/20°C | ASTM D 1298 | 1.124 |
| Refractive Index @ 20°C | — | 1.4539 |
| Boiling Point @ 760 mmHg | — | 288°C (550°F) |
| Freezing Point | — | -7°C (19°F) |
| Flash Point (PMCC) | ASTM D 93 | 166°C (331°F) |
| Autoignition Temperature | — | 371°C (700°F) |
| Vapor Pressure @ 20°C | — | <0.01 mmHg |
| Vapor Density (Air = 1) | — | 5.17 |
| Kinematic Viscosity @ 40°C | ASTM D 445 | 17.4 cSt |
| Water Solubility | — | Miscible (complete) |
| Lower Explosive Limit (LEL) | — | 0.9% |
| Upper Explosive Limit (UEL) | — | 9.2% |
| HMIS Rating | — | Health 2, Flammability 1, Reactivity 0 |
| HS Code | — | 2909.49.00 |
| IMDG Classification | — | Non-Dangerous Goods |
Note: Triethylene glycol is hygroscopic and will absorb atmospheric moisture; store in tightly sealed containers under inert atmosphere (nitrogen blanket) to maintain product quality and prevent corrosion of carbon steel or aluminum storage equipment. For longer-term color stability, minimize exposure to elevated temperatures and protect from direct sunlight. TEG is combustible when preheated; keep away from heat sources, sparks, and open flames. Avoid eye contact—TEG is an eye irritant; use appropriate eye protection and wash thoroughly if contact occurs. TEG is not classified as a dangerous good for transport under IMDG regulations. Consult the Safety Data Sheet (SDS) for complete hazard information, exposure limits, first aid measures, and handling precautions.
