双隔壁反应精馏塔的设计与控制

Design and control of a reactive double dividing-wall distillation column (R-DDWDC)

以1个反应精馏塔串接2个常规精馏塔的多塔流程为基础,通过过程强化设计了一种双隔壁反应精馏塔(R-DDWDC),左隔壁集成反应操作和分离操作,右隔壁集成2个常规分离操作,二者的有效协作能够显著降低过程的设备投资成本和操作能耗。在稳态设计的基础上,提出了一种R-DDWDC的5点温度控制策略。该温度控制策略能够抑制较大的进料流量和浓度干扰,且具有很小的稳态误差。研究结果验证了采用R-DDWDC可分离具有最不利热力学特性和不利动力学特性的四元反应物系。

A reactive double dividing-wall distillation column(R-DDWDC) is derived through the intensification of a multi-unit system involving in a reactive distillation column followed by two conventional distillation columns.While the left dividing-wall integrates the reaction operation and separation operation involved, and the right one integrates two conventional separation operations involved.The effective collaboration between two walls can secure potentially a considerable reduction in capital investment and operating cost.For the R-DDWDC,a five-point temperature control strategy is developed on the basis of steady state design, which can reject large disturbances from feed flow rate and feed concentration, and has small steady-state errors.These outcomes highlight that the R-DDWDC can be potentially a competitive option for the separations of quaternary reactive mixtures with the most unfavorable thermodynamic properties and unfavorable reaction kinetics.