分段导数分析法用于苯胺甲醛缩合反应过程综合

Application of piecewise derivative analysis in process synthesis of aniline and formaldehyde condensation reaction

苯胺甲醛缩合制多胺的反应是典型的第Ⅲ类反应体系,反应过程复杂。针对反应的阶段性特征,采用分段导数分析法对其进行反应器网络综合,第一阶段应采用DSR或PFR;第二阶段应采用PFR。采用不同的流程结构进行试验,结果为:采用DSR+PFR的流程结构,最终产品中二氨基二苯甲烷(MDA)含量最高;采用PFR+PFR的流程结构,最终产品中二氨基二苯甲烷(MDA)含量次之。试验结果与导数分析法分析结果一致,表明本文所用方法是有效的。

Synthesis of polyamine from aniline and formaldehyde is a typical type III reaction system, so the reaction process is complex. In view of the stage characteristics of type III reaction system, piecewise derivative analysis was used to solve the problem of its reactor network synthesis. Differential side-stream reactor（DSR） or plug flow reactor （PFR） should be used in the first reaction stage and PFR should be used in the second reaction stage. A series of experiments with different process structures were done, and the results were compared with theoretical analysis. The results of the experiments showed that the amount of methylenedianiline （MDA） was the highest with the structure of DSR and PFR. The amount of MDA was the second highest with the structure of PFR and PFR. The experimental results were consistent with the piecewise derivative analysis results, indicating the effectiveness ofpiecewise derivative analysis.