Nonlinear Dynamics of Reactive Distillation Processes for the Production of Fuel Ethers

Mohl, K. D.; Kienle, Achim; Gilles, Ernst Dieter; Rapmund, P.; Sundmacher, Kai; Hoffmann, Ulrich

doi:10.1016/s0098-1354(97)00178-6

Cited by 22 publications

(11 citation statements)

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“…Fig. 5 shows the output multiplicity for a range of boil-up ratio, and the stable solution branches found here are different from previous papers [15,16] . Here, four distinct stable solution branches based on four different initial guesses of boil-up ratio are compared as example, which are 0.0001, 0.1, 0.7 and 1.0.…”

Section: Multiplicity Analysis For Eg Synthesiscontrasting

confidence: 91%

Multiplicity Analysis in Reactive Distillation Column Using ASPEN PLUS

Yang¹,

Wu²,

Guo³

et al. 2006

Chinese Journal of Chemical Engineering

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Reactive distillation processes for synthesis of ethylene glycol (EG) and ethyl tert-butyl ether (ETBE) were modeled with the simulation package ASPEN PLUS. The input multiplicity and output multiplicity were discussed with the method of sensitivity analysis for both cases. In EG production process, steady state multiplicities were studied in terms of effective liquid holdup volume and boil-up ratio. In ETBE synthesis process, the user kinetic subroutine was supplied into ASPEN PLUS firstly, and then the composition, temperature and reaction-rate profiles within the reactive distillation column were presented in detail. A set of stable solution branches based on distinct initial guesses for a range of boil-up ratio were found in EG synthesis. Input multiplicities were observed for a range of reboiler duty at several values of reflux ratio for ETBE synthesis process. These results can be used to avoid excessive energy consumption and achieve optimum design of reactive distillation column.

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Section: Multiplicity Analysis For Eg Synthesiscontrasting

confidence: 91%

Multiplicity Analysis in Reactive Distillation Column Using ASPEN PLUS

Yang¹,

Wu²,

Guo³

et al. 2006

Chinese Journal of Chemical Engineering

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“…They defined the multiplicity regions for the reflux ratio, with respect to both the pressure and the reboil ratio. The first multiplicity experimental evidence on CDCs was presented by Bravo et al 24 sand later by Mohl and co-workers [25][26][27] sfor the TAME synthesis. For both the MTBE and TAME syntheses, they identified the multiplicity region for the reflux ratio, the bottom flow rate, and the reboiler duty.…”

Section: Reactive Systems Multiplicitiesmentioning

confidence: 98%

On the Multiplicities of a Catalytic Distillation Column for the Deep Hydrodesulfurization of Light Gas Oil

Rosales-Quintero

Vargas-Villamil

2009

Ind. Eng. Chem. Res.

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Catalytic distillation integrates the reaction and separation into a single unit. Nevertheless, this integration leads to complex open-loop behaviors, as a consequence of nonlinear interactions. As a result, multiplicities and trajectories with complex attracting sets may arise. Multiplicities must be considered during design, operation, and control, because a process with multiplicities may be difficult to control and operate. In this work, the changes in the topological structure of the solutions of a light-gas-oil deep-hydrodesulfurization one-bed catalytic distillation column are studied. A cost-optimal operating point is chosen as a base case. It is obtained by minimizing the total annual cost, while keeping the total sulfur concentration less than 15 ppm. This design is studied to identify the operating region where multiplicities arise. A connection between operability (pressure) and design (catalyst mass) was made and a rich nonlinear behavior was found (i.e., isola branches, criss-cross patterns, cusp bifurcations, input multiplicities, output multiplicities, and input-output multiplicities). Bifurcation diagrams are presented for the most important design and control/operating variables. Yet, no multiplicity was found near the cost-optimal operating point; thus, its operation and control should not be a problem.

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“…Recently, Mohl et al (1997) did bifurcation calculations for the Nijhuis column and showed that MSS disappear at low reflux values but still exist at high reflux. However, no oscillations were observed in the dynamic transitions between the different steady states in the multiplicity interval.…”

Section: Multiple Steady States In Reactive Distillationmentioning

confidence: 99%

“…This contradicts the previous results because both studies used step disturbances in the feed composition. MSS have further been demonstrated for the industrial production of TAME (Bravo et al, 1993;Mohl et al, 1997). The effect of different thermodynamic models and parameters on the existence of MSS for the Nijhuis and Clausthal columns was studied by Pilavachi et al (1997).…”

Section: Multiple Steady States In Reactive Distillationmentioning

confidence: 99%

Predicting Multiple Steady States in Equilibrium Reactive Distillation. 1. Analysis of Nonhybrid Systems

Güttinger

Morari

1999

Ind. Eng. Chem. Res.

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During the last few years, multiple steady states (output multiplicities) have been discovered for reactive distillation processes, for example, for the production of fuel ethers and for some esterification processes. Using the transformation of Ung and Doherty (Chem. Eng. Sci. 1995e, 50 (1), 23−48), a method is presented to predict the existence of output multiplicities based on the reactive vapor−liquid equilibrium for the limiting case of reactive columns of infinite length operated at infinite internal flows. This graphical method rests upon the ∞/∞ analysis for azeotropic distillation columns by Bekiaris et al. (Ind. Eng. Chem. Res. 1993, 32 (9), 2023−2038). It is directly applicable to systems where the reactions take place in the entire column (“nonhybrid” columns). When all possible profiles and products are located through a bifurcation analysis, qualitative and quantitative predictions are obtained. The region of feed compositions leading to multiple steady states can be constructed graphically by applying a necessary and sufficient geometrical condition. The prediction results are shown to carry over to finite columns by application to the methyl tert-butyl ether process and are verified by simulation.

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Nonlinear Dynamics of Reactive Distillation Processes for the Production of Fuel Ethers

Cited by 22 publications

References 0 publications

Multiplicity Analysis in Reactive Distillation Column Using ASPEN PLUS

Multiplicity Analysis in Reactive Distillation Column Using ASPEN PLUS

On the Multiplicities of a Catalytic Distillation Column for the Deep Hydrodesulfurization of Light Gas Oil

Predicting Multiple Steady States in Equilibrium Reactive Distillation. 1. Analysis of Nonhybrid Systems

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