合成己二腈反应技术研究——(Ⅴ)己二腈工业反应过程模拟与反应器改造

STUDIES ON THE ADIPONITRILE SYNTHESIS TECHNOLOGY(Ⅴ)MODELLING OF INDUSTRIAL ADIPONITRILE PROCESS AND ITS REFORMING SCHEME

对己二腈工业反应器提出了两釜串联带回流的模型,通过模拟计算得出模型的级间返混系数 f=6的结论。该模型能较好地预测工业反应器中物料组分浓度变化和气、液两相的流动特性;指出了现工业反应器的鼓泡中和段体积偏小是造成己二酸浓度偏高的关键;提出了可以通过增加串连一个鼓泡预反应段的改造方案,能有效地降低己二酸的浓度,从7%降至4%左右,从而能较好地减缓腐蚀和结焦。

A model with two CSTR in series and backward flow between interstages was presented here to simulate the performane of a commerieal adiponitrile reactor,in which a backmixing factor f was taken as the parameter.The concentration variations of materials within the reactor and some flow characteristics of gas and liquid phase could be well predicted.It was also pointed out from the simu- lation that the small size of neutralizing-bubbling section in the commercial system is responsible for the relatively high concentration of adipic acid.It is,therefore,proposed to set an additional bub- bling section prior to the reactor,so that the concentration of adipic acid can be effectively lowered (from 7% to 4%).Meanwhile corrosion and eoke formation within the reactor could be well con- trolled.