TY  - JOUR
AU  - Felischak, Matthias
AU  - Lothar, Kaps
AU  - Christof, Hamel
AU  - Nikolić, Daliborka
AU  - Petkovska, Menka
AU  - Seidel-Morgenstern, Andreas
PY  - 2021
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4139
AB  - It is well known, that forced periodic operation possesses the potential for process improvements. Nevertheless, only a small number of applications is reported, due to complex realization, limited predictability and high inertia of larger units. Nonlinear frequency response (NFR) analysis has proven to predict efficiently time-averaged performance of reactor effluent streams originating from forced periodic changes of one or several input(s).
Focus of this paper was an experimental demonstration of forced periodic operation applied to the hydrolysis of acetic anhydride carried out in an adiabatic CSTR. Theoretical results provided a guideline for experiments exploiting simultaneous sinusoidal modulations of the anhydride inlet concentration and the total volumetric flow-rate. Influences of the forcing parameters (amplitudes and the phase difference) were also studied. Confirming the predictions of NFR analysis a significantly higher time-averaged product yields were experimentally achieved compared to conventional steady-state operation with simultaneous modulation of two inputs using an
optimized phase shift.
PB  - Elsevier
T2  - Chemical Engineering Journal
T1  - Analysis and experimental demonstration of forced periodic operation of an adiabatic stirred tank reactor: Simultaneous modulation of inlet concentration and total flow-rate
VL  - 410
IS  - 128197
DO  - 10.1016/j.cej.2020.128197
ER  - 

@article{
author = "Felischak, Matthias and Lothar, Kaps and Christof, Hamel and Nikolić, Daliborka and Petkovska, Menka and Seidel-Morgenstern, Andreas",
year = "2021",
abstract = "It is well known, that forced periodic operation possesses the potential for process improvements. Nevertheless, only a small number of applications is reported, due to complex realization, limited predictability and high inertia of larger units. Nonlinear frequency response (NFR) analysis has proven to predict efficiently time-averaged performance of reactor effluent streams originating from forced periodic changes of one or several input(s).
Focus of this paper was an experimental demonstration of forced periodic operation applied to the hydrolysis of acetic anhydride carried out in an adiabatic CSTR. Theoretical results provided a guideline for experiments exploiting simultaneous sinusoidal modulations of the anhydride inlet concentration and the total volumetric flow-rate. Influences of the forcing parameters (amplitudes and the phase difference) were also studied. Confirming the predictions of NFR analysis a significantly higher time-averaged product yields were experimentally achieved compared to conventional steady-state operation with simultaneous modulation of two inputs using an
optimized phase shift.",
publisher = "Elsevier",
journal = "Chemical Engineering Journal",
title = "Analysis and experimental demonstration of forced periodic operation of an adiabatic stirred tank reactor: Simultaneous modulation of inlet concentration and total flow-rate",
volume = "410",
number = "128197",
doi = "10.1016/j.cej.2020.128197"
}

Felischak, M., Lothar, K., Christof, H., Nikolić, D., Petkovska, M.,& Seidel-Morgenstern, A.. (2021). Analysis and experimental demonstration of forced periodic operation of an adiabatic stirred tank reactor: Simultaneous modulation of inlet concentration and total flow-rate. in Chemical Engineering Journal
Elsevier., 410(128197).
https://doi.org/10.1016/j.cej.2020.128197

Felischak M, Lothar K, Christof H, Nikolić D, Petkovska M, Seidel-Morgenstern A. Analysis and experimental demonstration of forced periodic operation of an adiabatic stirred tank reactor: Simultaneous modulation of inlet concentration and total flow-rate. in Chemical Engineering Journal. 2021;410(128197).
doi:10.1016/j.cej.2020.128197 .

Felischak, Matthias, Lothar, Kaps, Christof, Hamel, Nikolić, Daliborka, Petkovska, Menka, Seidel-Morgenstern, Andreas, "Analysis and experimental demonstration of forced periodic operation of an adiabatic stirred tank reactor: Simultaneous modulation of inlet concentration and total flow-rate" in Chemical Engineering Journal, 410, no. 128197 (2021),
https://doi.org/10.1016/j.cej.2020.128197 . .

TY  - CONF
AU  - Felischak, Matthias
AU  - Nikolić, Daliborka
AU  - Petkovska, Menka
AU  - Christof, Hamel
AU  - Seidel-Morgenstern, Andreas
PY  - 2016
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3845
AB  - The method of nonlinear frequency response (NFR) attempts to predict the outcome of perturbation for the instructive input variables using nonlinear functions within the model equations. The aim of the derived models is the estimation of optimal frequencies and amplitudes for sinusoidal changes of the total inlet flow, concentration, temperature and the cooling temperature, as well as combinations of several of these inputs. As a model reaction the hydrolysis of acetic anhydride in a continuously stirred tank reactor (CSTR) has been chosen. This exothermal reaction is investigated for the cases of separately and simultaneously modulated inlet concentrations and feed flow rates. For the experimental validation of predicted model-based results at first a verification and adjustment of the kinetic parameters is performed. Based on these results an optimal steady-state is calculated, which is used as an initial state of periodic operations. To estimate the performance of the reaction system mean values of the conversion of acetic anhydride and the yield of acetic acid are compared to the corresponding steady-state values of the reactor. Different forcing frequencies, input amplitudes and, for multiple input parameter, phase shift between them are investigated. The theoretical foundation as well as systematic exploration of the experimental possibilities will be presented.
C3  - 22nd International Congress of Chemical and Process Engineering (CHISA 2016), Prague, Czech Republic
T1  - Evaluation of nonlinear frequency response method for the hydrolysis of acetic anhydride
UR  - https://hdl.handle.net/21.15107/rcub_cer_3845
ER  - 

@conference{
author = "Felischak, Matthias and Nikolić, Daliborka and Petkovska, Menka and Christof, Hamel and Seidel-Morgenstern, Andreas",
year = "2016",
abstract = "The method of nonlinear frequency response (NFR) attempts to predict the outcome of perturbation for the instructive input variables using nonlinear functions within the model equations. The aim of the derived models is the estimation of optimal frequencies and amplitudes for sinusoidal changes of the total inlet flow, concentration, temperature and the cooling temperature, as well as combinations of several of these inputs. As a model reaction the hydrolysis of acetic anhydride in a continuously stirred tank reactor (CSTR) has been chosen. This exothermal reaction is investigated for the cases of separately and simultaneously modulated inlet concentrations and feed flow rates. For the experimental validation of predicted model-based results at first a verification and adjustment of the kinetic parameters is performed. Based on these results an optimal steady-state is calculated, which is used as an initial state of periodic operations. To estimate the performance of the reaction system mean values of the conversion of acetic anhydride and the yield of acetic acid are compared to the corresponding steady-state values of the reactor. Different forcing frequencies, input amplitudes and, for multiple input parameter, phase shift between them are investigated. The theoretical foundation as well as systematic exploration of the experimental possibilities will be presented.",
journal = "22nd International Congress of Chemical and Process Engineering (CHISA 2016), Prague, Czech Republic",
title = "Evaluation of nonlinear frequency response method for the hydrolysis of acetic anhydride",
url = "https://hdl.handle.net/21.15107/rcub_cer_3845"
}

Felischak, M., Nikolić, D., Petkovska, M., Christof, H.,& Seidel-Morgenstern, A.. (2016). Evaluation of nonlinear frequency response method for the hydrolysis of acetic anhydride. in 22nd International Congress of Chemical and Process Engineering (CHISA 2016), Prague, Czech Republic.
https://hdl.handle.net/21.15107/rcub_cer_3845

Felischak M, Nikolić D, Petkovska M, Christof H, Seidel-Morgenstern A. Evaluation of nonlinear frequency response method for the hydrolysis of acetic anhydride. in 22nd International Congress of Chemical and Process Engineering (CHISA 2016), Prague, Czech Republic. 2016;.
https://hdl.handle.net/21.15107/rcub_cer_3845 .

Felischak, Matthias, Nikolić, Daliborka, Petkovska, Menka, Christof, Hamel, Seidel-Morgenstern, Andreas, "Evaluation of nonlinear frequency response method for the hydrolysis of acetic anhydride" in 22nd International Congress of Chemical and Process Engineering (CHISA 2016), Prague, Czech Republic (2016),
https://hdl.handle.net/21.15107/rcub_cer_3845 .