Non-ionic surface active agents — Polyalkoxylated derivatives — Determination of hydroxyl value — Phthalic anhydride method

Informationen über die Norm:

Bezeichnung normen: ISO 4327:1979
Ausgabedatum normen: 1.12.1979
Zahl der Seiten: 8
Gewicht ca.: 24 g (0.05 Pfund)
Land: Internationale technische Norm
Kategorie: Technische Normen ISO

Die Annotation des Normtextes ISO 4327:1979 :

Description / Abstract: The hydroxyl groups are esterified by phthalic anhydride in pyridine solution. The excess of phthalic anhydride is hydrolyzed with water containing in the sodium hydroxide solution used for the neutralization. The acidity which appears during the esterification and of the phthalic acid formed during the hydrolysis is neutralized by sodium hydroxide solution in the presence of phenolphthalein as indicator. The hydroxyl value is calculated from the difference between the volumes of sodium hydroxide solution used for the titration of the blank and of the test solution.