Triethanolamine
CAS Number: 102-71-6
Chemical Formula: C6H15NO3
Synonyms: 2-[Bis-(2-hydroxy-ethyl)-amino]-ethanol，Ethanol 2,2′,2”-nitrilotris，Alkanolamine 244
Appearance: Oily Liquid
MOQ (Minimum Order Quantity): 1 FCL (Full Container Load)
Triethanolamine is a colorless oily liquid with a faint ammoniacal odor. It is hygroscopic and tends to darken upon exposure to air and light. It forms colorless or pale yellow cubic crystals at low temperatures. It is fully miscible with water, methanol, and acetone, soluble in benzene and ether, and slightly soluble in carbon tetrachloride and n-heptane. It is strongly alkaline, capable of proton binding, and suitable for condensation reactions.
Chemical Properties
| Item | Value |
| Melting point | 17.9-21 °C (lit.) |
| Boiling point | 190-193 °C/5 mmHg (lit.) |
| density | 1.124 g/mL at 25 °C (lit.) |
| vapor density | 5.14 (vs air) |
| vapor pressure | 0.01 mm Hg ( 20 °C) |
| refractive index | n20/D 1.485(lit.) |
| Fp | 365 °F |
| storage temp. | Store at RT. |
| solubility | H2O 1 M clear colorless |
| form | Oily Liquid |
| Specific Gravity | 1.125 (20/20℃) |
| color | Clear colorless to slightly yellow |
| Odor | Mild ammoniacal. |
| PH | 10.5-11.5 (25℃ 1M in H2O) |
| PH Range | 7.3 – 8.3 |
| pka | 7.8(at 25℃) |
| explosive limit | 3.6-7.2%(V) |
| Water Solubility | soluble |
| λmax | λ: 280 nm Amax: 0.1 |
| Sensitive | Air Sensitive & Hygroscopic |
| Merck | 14,9665 |
| BRN | 1699263 |
| Exposure limits | ACGIH TWA 5 mg/m3 |
| Dielectric constant | 6.9（40℃） |
| Cosmetics Ingredients Functions | BUFFERING SURFACTANT – EMULSIFYING SURFACTANT – CLEANSING FRAGRANCE |
| InChIKey | GSEJCLTVZPLZKY-UHFFFAOYSA-N |
| LogP | -2.3 at 25℃ |
| Surface tension | 46.4mN/m at 293.15K |
| CAS DataBase Reference | 102-71-6(CAS DataBase Reference) |
| IARC | 3 (Vol. 77) 2000 |
| NIST Chemistry Reference | Triethanolamine(102-71-6) |
| EPA Substance Registry System | Triethanolamine (102-71-6) |
Safety Information
| Item | Value |
| Hazard Codes | Xi |
| Risk Statements | 36/37/38-36 |
| Safety Statements | 26-39-36 |
| WGK Germany | 1 |
| RTECS | KL9275000 |
| F | 3-10-23 |
| Autoignition Temperature | 600 °F |
| TSCA | Yes |
| HS Code | 29221310 |
| HS Code | 29321900 |
| Hazardous Substances Data | 102-71-6(Hazardous Substances Data) |
| Toxicity | LD50 orally in Rabbit > 5000 mg/kg LD50 dermal Rabbit > 2000 mg/kg |
Product Application
In analytical chemistry, triethanolamine acts as a stationary phase for gas–liquid chromatography (max temperature 75 ℃, solvents methanol and ethanol) and separates pyridine and its methyl derivatives. It serves as a masking agent for interfering ions in complexometric titration. For example, at pH 10, it masks titanium, aluminum, iron, and tin ions during EDTA titration of magnesium, zinc, cadmium, calcium, and nickel. It can also be mixed with hydrochloric acid to prepare buffer solutions at defined pH values.
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