Abstract Preview

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.


General information

  • Status :  Published
    Publication date : 1979-12
  • Edition : 1
    Number of pages : 8
  • :
    ISO/TC 91
    Surface active agents
  • 71.100.40
    Surface active agents

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A standard is reviewed every 5 years



Revisions / Corrigenda

  • Now confirmed
    ISO 4327:1979

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