Résumé
PrévisualiserThe 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.
-
État actuel: PubliéeDate de publication: 1979-12
-
Edition: 1Nombre de pages: 8
-
- ICS :
- 71.100.40 Agents de surface
Acheter cette norme
Format | Langue | |
---|---|---|
std 1 61 | ||
std 2 61 | Papier |
- CHF61
Cycle de vie
Vous avez une question?
Consulter notre FAQ
Horaires d’ouverture:
De lundi à vendredi - 09:00-12:00, 14:00-17:00 (UTC+1)
Suivez l'actualité de l'ISO
Inscrivez-vous à notre Newsletter (en anglais) pour suivre nos actualités, points de vue et informations sur nos produits.