| Popis: |
The best reaction condition for disproportionation of tall rosin with active carbon was investigated.For 250°C of reaction temperature, 20% of catalyst and 5 hr of reaction were found optimum, and the quantity of catalyst could be reduced with increase of reaction temperature. Range of 250260°C was found suitable. At 300°C, some side reaction occurred. More side reaction was caused by using dry active carbon than wet active carbon. Dry active carbon produces slightly more unsaponifiable matter, and also the saponifiable matter produced by dry active carbon includes side reaction product with maximum absorption at 224 mμ and 260 mμ. It was difficult to halt production of unsaponifiable matter remarkably with water contained in the catalyst or by adding water to reaction system. Active carbon produced 1417% range of unsaponifiable matter. Active carbon, once used, lowers remarkably in catalytic activity and it tends to decrease in its activity by subsequent uses. |
