Dynamical and technological consequences of multiple isolas of steady states in a catalytic fluidised-bed reactor

Open access


Steady-state characteristics of a catalytic fluidised bed reactor and its dynamical consequences are analyzed. The occurrence of an untypical steady-state structure manifesting in a form of multiple isolas is described. A two-phase bubbling bed model is used for a quantitative description of the bed of catalyst. The influence of heat exchange intensity and a fluidisation ratio onto the generation of isolated solution branches is presented for two kinetic schemes. Dynamical consequences of the coexistence of such untypical branches of steady states are presented. The impact of linear growth of the fluidisation ratio and step change of the cooling medium temperature onto the desired product yield is analyzed. The results presented in this study confirm that the identification of a region of the occurrence of multiple isolas is important due to their strong impact both on the process start-up and its control.

Abba I.A., Grace J.R., Bi H.T., 2002. Variable-gas-density fluidized bed reactor model for catalytic processes. Chem. Eng. Sci., 57, 4797-4807. DOI: 10.1016/S0009-2509(02)00289-0.

Ajbar A., Alhumazi K., Elnashaie, S.S.E.H., 2001. Classification of static and dynamic behaviour in a fluidized-bed catalytic reactor. Chem. Eng. J., 84, 503-516. DOI: 10.1016/S1385-8947(00)00373-9.

Balakotaiah V., West D.H., 2014. Thermal effects and bifurcations in catalytic partial oxidations. Curr. Opin, Chem, Eng., 5, 68-77. DOI: 10.1016/j.coche.2014.05.002.

Berezowski M., 2000. Method of determination of steady-state diagrams of chemical reactors. Chem. Eng. Sci., 55, 4291-4295. DOI: 10.1016/S0009-2509(00)00058-0.

Berezowski M., 2002. Złożona struktura stanów stacjonarnych układu równolegle połączonych reaktorów zbiornikowych. Inż. Chem. Proc., 23, 415-423.

Berezowski M., 2010. The application of the parametric continuation method for determining steady state diagrams in chemical engineering. Chem. Eng. Sci., 65, 5411-5414. DOI: 10.1016/j.ces.2010.07.003.

Bizon K., 2016. Autothermicity, multiplicity, yield and selectivity of catalytic processes in a polytropic fluidized bed reactor. Chem. Eng. J., 288, 834-844. DOI: 10.1016/j.cej.2015.12.061.

Pinto J.C., Ray W.H., 1995. The dynamic behavior of continuous solution polymerization reactors – VIII. A full bifurcation analysis of a lab-scale copolymerization reactor. Chem. Eng. Sci., 50, 1041-1056. DOI: 10.1016/j.cej.2015.12.061.

Seydel R., 1994. Practical bifurcation and stability analysis. From equilibrium to chaos. Springer-Verlag, New York.

Tabiś B., 2001. Methanol synthesis in a fluidized-bed reactor coupled with an external heat exchanger. The effect of feedback deformation. Chem. Eng. J., 83, 191-200. DOI: 10.1016/S1385-8947(00)00254-0.

Uppal A., Ray W.H., Poore A.B., 1976. The classification of the dynamic behavior of continuous stirred tank reactors - Influence of reactor residence time. Chem. Eng. Sci., 31, 205-214. DOI: 10.1016/0009-2509(76)85058-0.

Westerink E.J., Westerterp K.R., 1990. Stable design and operation of catalytic fluidized-bed reactors for multiple reactions: Uniqueness and multiplicity. Chem. Eng. J., 45, 317-332. DOI: 10.1016/0009-2509(90)87103-Y.

Zahn V.M, 2012. Adiabatic simulated moving bed reactor – principle, nonlinear analysis and experimental demonstration. Shaker Verlag GmbH, Herzogenrath.

Chemical and Process Engineering

The Journal of Committee of Chemical and Process of Polish Academy of Sciences

Journal Information

IMPACT FACTOR 2016: 0.971

CiteScore 2016: 1.03

SCImago Journal Rank (SJR) 2016: 0.395
Source Normalized Impact per Paper (SNIP) 2016: 0.873


All Time Past Year Past 30 Days
Abstract Views 0 0 0
Full Text Views 51 51 16
PDF Downloads 21 21 6