Abstract
AbstractAn analytical procedure is presented for determination of the rosin and fatty acid contents of tall oil products. Rosin acids are determined by titration after selective esterification of the fatty acids at room temperature with anhydrous methanolic hydrochloric acid reagent. The fatty acid content is calculated by difference from acid number and rosin acid determinations. The method presented has smaller sample requirements, shorter analysis time, greater selectivity, and improved precision above 15% rosin acid compared to standard procedures. The standard deviations for the determination of percent rosin and fatty acids have been found to be 0.30 and 0.34, respectively, over the entire concentration range. The reaction mechanism of acid catalyzed esterification is discussed with respect to the reaction rates and selectivity. The esterification variables which were investigated include catalyst concentration, sample size, reaction time, selectivity, and effect of water.
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