Analysis of the lumped and distributed optimal temperature trajectories for packed bed reactors with concentration dependent catalyst deactivation

Abstract

Algorithms published previously by the authors for solving the problem of spatially uniform and non‐uniform temperature optimal control in tubular fixed bed reactors have been applied to three systems with series catalyst deactivation and different ratios between the activation energies of the main and deactivation reactions. The optimal temperature and conversion trajectories as well as the maximum production obtained have been compared at the same final duration of operation. Systems with slow deactivation obtain maximum production with spatially uniform control, whilst for systems with rapid deactivation the temperature trajectory distributed both in space and time improves the production obtained with lumped control.

Infrared absorption sensor for multiple gas sensing. Development of a Fabry–Perot spectrometer with ultrawide wavelength range

“…The catalyst bed has been divided into a series of N differential fixed‐bed subreactors connected to each other. Considering N is large enough, each differential fixed‐bed subreactor can be assumed as a perfectly mixed reactor, following the methodology proposed by González‐Velasco et al24 Thus, the n th subreactor represents the n / N dimensionless position along the integral reactor. The time coordinate could also be divided into τ intervals.…”

“…In the literature, studies treating the problem of optimization of reactors subject to catalyst decay, either tubular21–24 or batch reactors,25–27 as well as isothermal28, 29 or adiabatic30, 31 inclusive of enzymatic reactors,32 may be found. In this paper, an optimization of the industrial adiabatic plug‐flow LTWGS reactor, subject to irreversible poisoning, is presented.…”

Optimization of inlet temperature for deactivating LTWGS reactor performance

“…Considering N is large enough, each differential fixed-bed subreactor can be assumed as a perfectly mixed reactor, following the methodology proposed by González-Velasco et al 24 Thus, the nth subreactor represents the n/N dimensionless position along the integral reactor. The time coordinate could also be divided into intervals.…”

“…In the literature, studies treating the problem of optimization of reactors subject to catalyst decay, either tubular [21][22][23][24] or batch reactors, [25][26][27] as well as isothermal 28,29 or adiabatic 30,31 inclusive of enzymatic reactors, 32 may be found. In this paper, an optimization of the industrial adiabatic plug-flow LTWGS reactor, subject to irreversible poisoning, is presented.…”