Standard Test Method for Determination of Fatty Acids and Esters in Glycerin

Importancia y uso:

4.1 Any residual fatty acid and esters (FA&E) should be present only at very low levels in purified glycerine.

4.2 This procedure requires the addition of a measured volume of sodium hydroxide, in excess of the amount actually needed to react with FA&E in the glycerine sample. After boiling, the excess sodium hydroxide is back titrated with standardized hydrochloric acid. The quantity of the substance being titrated is calculated as the difference between the volumes of the sodium hydroxide solution originally added, corrected by means of a blank titration, and that was consumed by the titrant in the back titration.

Note 1: The standardized solutions for sodium hydroxide and hydrochloric acid are commercially available.

Subcomité:

D15.04

Referida por:

D7640-16R21, D7736-19AR23

Volúmen:

15.05

Número ICS:

71.080.60 (Alcohols. Ethers)

Palabras clave:

antifreeze; engine coolant; esters; ethylene; fatty acids; glycerin; glycerine; glycerol; titrimetric;