Raney镍上松香催化加氢本征动力学

测定在不同类型搅拌器下高压釜的持气量和反应效果 ,认识到松香在Raney镍上催化加氢反应受到外扩散的严重影响 ,利用加入 2 0 0号溶剂油、改造搅拌器类型、提高搅拌速度的方法消除外扩散 ,使反应处于化学动力学控制区 ,然后采集动力学数据 ,经对 17种可能的反应机理模型进行筛选 ,推测的反应机理为 :松香中的主要成分枞酸分子不吸附 ,枞酸分子与催化剂表面上被吸附的氢原子进行反应 ,氢原子的吸附为控制步骤 ,据此导出其本征动力学方程 .

INTRINSIC KINETICS OF CATALYTIC HYDROGENATION OF ROSIN ON RANEY NICKEL

The intrinsic kinetics of catalytic hydrogenation of rosin on Raney nickel was investigated at temperature 423 K to 453 K and under pressure 4 0 MPa to 7 0 MPa. Gas hold-up and reaction in autoclaves with different types of stirrers were determined. The result showed that the catalytic hydrogenation of rosin on Raney nickel is a reaction of external diffusion control. The external diffusion effect was eliminated by adding No 200 solvent oil, changing stirrer type and increasing rotational speed. Based on the experimental results, a suitable reaction model was selected from 17 probable reaction mechanism models, i e the main component abietic-acid in rosin is not absorbed and absorption of atomic hydrogen with reaction between atomically absorbed hydrogen on catalyst surface and abietic-acid could be the controlling step. The intrinsic kinetic equation was acquired. It is useful to provide a theoretical basis for the development of industrial process.