Automated Determination of Hydroxyl Number (HN) in Polyols According to DIN53240-2

The hydroxyl group is an important functional group and knowledge of the hydroxyl number, or hydroxyl group content, is required for the production of intermediate and finished products such as polyols, resins, paint resins and lubricants (petroleum industry). Hydroxyl Number in DIN53240 is determined by the catalytic acetylation of the hydroxyl group. After hydrolysis of the intermediate product, the remaining acetic acid is titrated with alcoholic KOH solution under non-aqueous conditions. An automated system is utilized to facilitate the sample preparation and analysis.

Keywords: Oil