Control And Analysis Of Reactive Distillation Columns With Multiple Reactive Sections:The Disproportionation Of Trichlorosilane To Silane

With respect to dealing with the separation and purification of complex reacting mixtures,the traditional industrial processes mainly adopt the columns with single reactive section to produce the target products.The columns are lack of additional degrees of freedom for system synthesis and analysis,resulting in that the whole system only depends on more energy to realize the purification and separation of the target product.As for the reaction system of the disproportionation of trichlorosilane to silane,the columns with multiple reactive sections are employed to elaborate the unique significance of applying multiple reactive sections handling complicated reaction processes.The reaction system is a three-stage consecutive reversible reaction that involves five components and possesses a relatively unfavorable thermodynamic conversion.Based on the reaction system,a series of settings are adopted to simplify the comparison among the columns with single reactive sections,the columns with double reactive sections and the columns with three reactive sections.After simplification,we can determine the performance of the system from reboiler heat duty or condenser heat duty.Through the comprehensive synthesis and comparative analysis of structure design of steady-state performance of three configurations of columns,compared with columns with single reactive section,the columns with double reactive sections and columns with three reactive sections can greatly reduce the energy consumption and capital investment.The attempt to install the intermediate condensers on the columns with multiple reactive sections is also further proved to be the thermodynamic rationality of the application of multiple reactive sections in process.Moreover,in terms of dynamic characteristics and controllability analysis,the columns with multiple reactive sections show smaller peak deviation,shorter settling time,stronger ability of anti-disturbance and set-point tracking ability.