【摘要】 苯酚直接羟化制备苯二酚为液固相的强放热快反应,催化剂的活性衰减很快.催化剂失活对催化过程的工艺流程、设备及操作条件的选择起着决定性的作用.本文利用催化剂的活性关联式计算了不同流程和操作条件下反应器中催化剂的平均活性.结果表明:宜采用三釜阶式串联反应流程,催化剂回用比例为0.8,过氧化氢加入总量应与平均活性相对应.调节回用比例可控制产物分布,延长催化剂开始失活时间有利于减少生产成本.更多还原

【Abstract】 The hydroxylation of phenol to produce dihydric phenol is a rapid and strongly exothermal reaction,the activity of the complex-oxide catalyst decreased rapidly.The deactivation of the catalyst is a key factor to choice the reactor type and process flow,to determine the optimal process conditions.The mean activity of catalyst was calculated at different operating conditions in this paper.The results showed that (3-CSTR) should be adopted and the recycle ratio is 0.8.The feeding amount of hydrogen peroxide should be in proportion to the mean activity.The distribution of products can be controlled by adjusting the recycle ratio.更多还原