双反应段反应精馏塔合成棕榈酸异丙酯动态特性的研究

Dynamic property of a reactive distillation column with two reaction sections for synthesis of isopropyl palmitate

双反应段反应精馏塔内部复杂的物质和能量耦合在提升稳态性能的同时可能会导致动态性能的降低。以合成棕榈酸异丙酯的吸热反应为例,借助商业软件Aspen Dynamic研究双反应段反应精馏塔稳态性能与动态性能之间的关系。结果表明,与稳态性能最优的过程设计相比,合理选取顶部反应段塔板数以及减少底部反应段塔板数能够提高系统的热力学效率并增加传质推动力,从而实现稳态设计与动态控制之间的折衷。

In the process of a reactive distillation column with two reaction sections,the dynamic controllability could probably be deteriorated due to the improvement of steady-state performance with internal mass and energy integration. In order to find out the connection between steady-state design and dynamic controllability,an illustrative example,the synthesis of isopropyl palmitate,is chosen. Compared to the basic model,if the number of stages of top and bottom reaction sections is deliberatively chosen,the system will have better capability of improving thermodynamic efficiency and enhancing mass transfer driving force. Therefore,a compromise between steady-state design and dynamic controllability is further achieved.