Ацетат диэтаноламина

Description

Diethanolamine acetate is a salt of acetic acid and diethanolamine, an amino alcohol with two hydroxyethyl groups at the nitrogen atom. Belongs to the class of amides/amino alcohols according to the internal classification of the catalogue; combines the properties of a weak base (amine) and a polar acid salt, due to which it interacts with both polar and non-polar components of formulations.

According to chemical logic, the substance is close to diethanolamine hydrochloride - the same “amino alcohol plus acid” pair, only with acetic acid instead of hydrochloric acid. The acetate salt dissociates less easily in water than the hydrochloride and gives a milder, buffering pH shift, which determines its choice for compositions in contact with the skin.

The weak acid/weak base pair in the salt provides a buffering capacity of sorts: when diluted with water, a solution of diethanolamine acetate changes pH less dramatically than a solution of a strong acid salt of the same amine, which is valuable in formulations for sensitive applications.

Basic Attributes

• CAS No: 23251-72-1
• Chemical formula: C4H11NO2, C2H4O2
• Molecular weight: 165.1876
• Accurate weight: 165.1
• EU number: 245-524-2
• UNII: 06A4MH69XZ
• DSSTox ID: DTXSID2029323
• PSA Specs: 89.79

Physico-chemical characteristics

• Density: 1.22 g/cm3
• Melting point: 55°C
• Boiling point: 239.4 °C at 760 mm Hg. Art.
• Flash point: 90.5 °C

Scope of application

Used as a surfactant, emulsifier and pH stabilizer in body care formulations, detergents and agricultural formulations. The ability to enter into alkylation and acylation reactions makes the substance a convenient intermediate in organic synthesis.

In the formulations of household chemicals and cosmetics, diethanolamine acetate salt is often introduced in small proportions precisely as a pH regulator: it stabilizes the acid-base balance of the emulsion during storage, reducing the risk of stratification of the composition and changes in its sensory characteristics over time.

Chemical properties

As an amino alcohol, it simultaneously contains amino and hydroxyl functional groups, providing double reactivity - with nitrogen (formation of salts, amides) and with hydroxyl (esterification). The acetate form increases compatibility with aqueous systems compared to free diethanolamine.

The presence of two hydroxyethyl substituents also allows the substance to act as a weak chelating agent towards a number of metals, which is sometimes used to soften the hardness of process water in household chemical compositions.

Storage and transportation conditions

Store in a tightly closed container in a cool, dry place, away from direct sunlight and heat sources due to its relatively low flash point (90.5°C). Avoid contact with strong oxidizing agents.

At room temperature, the substance is near the melting point (55 °C), therefore in commercial form it is more often found as a solid mass or paste; Before dosing into the recipe, if necessary, it is slightly heated until uniform melting.