Introduction
Triethanolamine, namely tris(2-hydroxyethyl)amine, is an organic compound and can be regarded as the trihydroxy substitution product of triethylamine. Similar to other amine compounds, due to the presence of lone pairs of electrons on the nitrogen atom, triethanolamine has weak basicity and is able to react with inorganic acids or organic acids to form salts.
Molecular formula
C6H15NO3
CAS NO.
102 - 71 - 6
Packing
225kg
Physical Properties
| Appearance | It is a colorless to pale yellow viscous liquid. |
| Odor | It has a faint, ammonia - like odor. |
| Melting Point | 21.2 °C |
| Boiling Point | 335.4 °C |
| Density | 1.124 g/cm³ at 25 °C |
| Solubility | It is highly soluble in water, ethanol, and methanol, but has limited solubility in ether and benzene. |
Chemical Properties
Triethanolamine is a tertiary amine, with a nitrogen atom bonded to three ethyl alcohol groups.
It is a weak base. It can react with acids to form salts. For example, it reacts with hydrochloric acid to form the corresponding triethanolammonium chloride salt.
It can also participate in esterification reactions with carboxylic acids. Additionally, it can form complexes with metal ions.
Uses
Cosmetics and Personal Care Products
It is widely used in the cosmetics industry. It acts as a pH adjuster, helping to maintain the appropriate acidity or alkalinity of products. It also functions as an emulsifier, which is crucial for stabilizing emulsions in creams, lotions, and shampoos, preventing the separation of oil and water phases.
Pharmaceuticals
In the pharmaceutical field, it is used as a buffering agent to adjust the pH of drug formulations. It can also be used as a solubilizing agent to improve the solubility of certain drugs in aqueous solutions.
Industrial Applications
It is used in the paint and coating industry as a pigment dispersant, helping to evenly disperse pigments in the paint matrix, which improves the color uniformity and stability of the coating. In the textile industry, it is used as a softening agent and finishing agent, enhancing the softness and hand - feel of fabrics. It is also used in the synthesis of surfactants, which are widely used in detergents and cleaning products.
Gas Treatment
Similar to diethanolamine, triethanolamine can be used to remove acidic gases such as carbon dioxide (CO2) and hydrogen sulfide (H2S) from gas streams in the petroleum and natural gas industry, although it is less commonly used than diethanolamine for this purpose due to its relatively lower reactivity.
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