Polyglycols for industrial use Determination of hydroxyl number Phthalic anhydride esterification method

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Hardcopy , PDF 1 User , PDF 3 Users , PDF 5 Users , PDF 9 Users

Language(s)

English, French

Published date

01-09-1981

Publisher

International Organization for Standardization

The hydroxy groups present in a test portion are esterified with phthalic anhydride. The excess phthalic anhydrids 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 apparat relative molecular mass may be calculated by a formula given.

DocumentType	Standard
Pages	3
PublisherName	International Organization for Standardization
Status	Current

Standards	Relationship
NFT 20 667 : 1984	Identical
UNE 55717:1984	Identical
NBN T 04 151 : 1983	Identical

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ISO 6796:1981

Polyglycols for industrial use Determination of hydroxyl number Phthalic anhydride esterification method

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