Hydroxyl number in polyols and oxo alcohols in accordance with ASTM E1899

Hoveddokument

Primary and secondary hydroxyl groups react with an excess of p-toluenesulfonyl isocyanate (TSI) to form an acidic carbamate. This can then be titrated with the strongly basic tetra-n-butylammonium hydroxide solution (TBAOH) under non-aqueous conditions using the Solvotrode.