常压反应-减压精馏耦合生产氯化苄的工艺优化设计

Optimum design of coupled atmospheric reaction-vacuum distillation technology for benzyl chloride production

采用常压反应-减压精馏耦合装置应用于甲苯氯化体系生产氯化苄。为了找到集成装置的最佳结构参数,建立了以独立反应量为基础的模型方程,并开发了基于Powell法的多层优化设计法。结果表明,在塔釜上升蒸汽量一定的情况下,增加精馏塔分离段塔板数、反应器台数、相邻反应器间间隔塔板数,反应能力有所增加,然而当其超过一定值后,反应能力增加的趋势不明显;在优化得到的结构操作参数下,反应能力与分离能力达到最佳匹配。

The coupled atmospheric reaction-vacuum distillation technology,that is a distillation column connected with side reactors,is employed in the production of benzyl chloride.An independent reaction amount is introduced in the reactor model to simulate the process.Moreover,a systematic design approach based on the Powell method is developed to seek the optimum configuration parameters.The effects of the design parameters,such as the number of stages in the distillation column,the number of stages between adjacent reactors and the number of reactors,on the process performance are well investigated.Results demonstrate that with the given vapor boilup rate,insufficient separation leads to a poor system performance,and excessive stages or reactors will not be benefit for the improvement of the reaction capability.The optimum match between reaction operation and separation operation can be achieved with the optimum design parameters obtained through the process design approach.