ISO-4326 Non-ionic surface active agents -- Polyethoxylated derivatives -- Determination of hydroxyl value -- Acetic anhydride method

ISO-4326 - 1ST EDITION - CURRENT


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The hydroxyl group is esterified by acetic anhydride in pyridine solution. The excess of acetic anhydride is hydrolized with water. The acidity which appears during the esterification and the acetic acid formed during the hydrolysis are neutralized by sodium hydroxide solution in the presence of phenolphthalein as indicator. The hydroxyl value is calculated from the difference between the volume od sodium hydroxide solution used for the titration of the blank and of the test solution.

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Document Number

ISO 4326:1980

Revision Level

1ST EDITION

Status

Current

Publication Date

March 1, 1980

Committee Number

ISO TC 91