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Polyglycols for industrial use -- Determination of hydroxyl number -- Phthalic anhydride esterification method
The hydroxy groups present in a test portion are esterified with *phthalic anhydride*.
The excess phthalic anhydride is hydrolyzed and the phthalic acid formed is neutralized with standard volumetric sodium hydroxide solution.
If the sample contains free acidity or alkalinity, a corresponding correction is made.
From the corrected hydroxyl number, the *apparent relative molecular mass* may be calculated by a formula given.
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