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Homepage>ISO Standards>ISO 4327 Non-ionic surface active agents - Polyalkoxylated derivatives - Determination of hydroxyl value - Phthalic anhydride method
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download between 0-24 hoursReleased: 1979
ISO 4327 Non-ionic surface active agents - Polyalkoxylated derivatives - Determination of hydroxyl value - Phthalic anhydride method

ISO 4327

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

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LANGUAGE
English
French
Standard´s number:ISO 4327
Pages:8
Edition:1
Released:1979
DESCRIPTION

ISO 4327


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.