Reference number
ISO 4327:1979
International Standard
ISO 4327:1979
Non-ionic surface active agents — Polyalkoxylated derivatives — Determination of hydroxyl value — Phthalic anhydride method
Edition 1
1979-12
Preview
ISO 4327:1979
10201
No disponible en español
Publicado (Edición 1, 1979)
Esta publicación se revisó y confirmó por última vez en 2019. Por lo tanto, esta versión es la actual.

ISO 4327:1979

ISO 4327:1979
10201
Idioma
Formato
CHF 63
Convertir Franco suizo (CHF) a tu moneda

Resumen

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.

Informaciones generales

  •  : Publicado
     : 1979-12
    : Cierre de la revisión [90.60]
  •  : 1
     : 8
  • ISO/TC 91
    71.100.40 
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