Control of Quaternary Ideal Endothermic Reactive Distillation with and without Internal Heat Integration

Abstract

Decentralized control system design is evaluated for a basic and an internally heat-integrated generic, ideal, double-feed, two-product reactive distillation system. The internally heat-integrated reactive distillation column (HiRDC) is obtained via catalyst redistribution into the rectifying zone and feed tray relocation. For basic regulatory control, three two-point control structures with a fixed reflux rate or a fixed reflux ratio operation policy are synthesized and evaluated for their closed-loop disturbance rejection characteristics using rigorous dynamic simulations. To eliminate the purity offsets for on-target product purities, product purity composition controllers manipulating the reflux ratio and stripping tray temperature set point are implemented. Reactive tray section composition control is necessary for on-target product purity operation of HiRDC.

Kinetics and catalytic distillation simulation for the heterogeneously catalytic synthesis of imine

“…In the whole catalytic distillation column, the vapour rise of the top of the column is critical to the conversion of the entire reaction. [ 4,44 ] Figure 6D shows the effect of distillation rate on the conversion rate and reboil duty. As the amount of vapour rise increases, the conversion rate increases remarkably, but the conversion rate basically does not change when the distillation rate rises to 300 kg/h.…”

Reaction‐separation interaction on the control of ideal two‐feed, two‐product exothermic reactive distillation columns

“…A quantitative comparison of the performance of the five control structures for the two designs for the throughput changes is given here. It is also necessary to appraise the performance of the control structures for feed composition changes . Control structures CS2 and CS6 are selected for this purpose.…”

Conventional Proportional‐Integral Control of a Dividing‐Wall Distillation Column with Discrete Measurements

“…1 are those reported by Ling and Luyben 10. Also, it is important to mention that other pairings in the control loops can be considered; e.g., in the work of Mathew et al 20, regarding the control of an ideal endothermic reactive distillation column with and without heat integration, the composition of the distillate was controlled by manipulating the reflux rate and the bottom's composition was controlled by adjusting a tray temperature in the stripping section. The selection of the pairings in the control loops can be done by using the relative gain array, or this selection can be carried out in terms of exergy analysis 21.…”