The effect of adsorption on mass transfer in fluidized bed catalytic reactors

2001-02-01
Aksahin, I
Eroğlu, İnci
Yucel, H
Tracer gas residence time distributions (RTD) in a laboratory scale fluidized bed system have been measured for pulses of three different tracer gases (methane, ethane and propane) at different temperatures in the range 323 to 435 K. The fluidized solid was a commercial zeolite based FCC catalyst (CBZ-2), and measurements were carried out in a superficial air velocity range of 0.01 to 0.04 m/s. The data were interpreted with two-phase dense phase dispersion models for adsorptive tracers, available in the literature. In addition, modified models were considered by assuming a stationary dense phase and neglecting axial dispersion in this phase. Mean residence time, mu (1), and the variance of the residence time, sigma (2), of RTD data were calculated for each experimental run. Applying the moment technique in the Laplace domain, the differential equations for all models considered were analytically solved.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING

Suggestions

The method of lines solution of discrete ordinates method for Nongray media experimental
Çayan, Fatma Nihan; Selçuk, Nevin; Department of Chemical Engineering (2006)
A radiation code based on method of lines (MOL) solution of discrete ordinates method (DOM) for the prediction of radiative heat transfer in nongray absorbing-emitting media was developed by incorporation of two different gas spectral radiative property models, namely wide band correlated-k (WBCK) and spectral line-based weighted sum of gray gases (SLW) models. Predictive accuracy and computational efficiency of the developed code were assessed by applying it to the predictions of source term distributions ...
Detecting stability of conical spouted beds based on information entropy theory
Savari, Chiya; Sotudeh-Gharebagh, Rahmat; Külah, Görkem; KÖKSAL, MURAT; Mostoufi, Navid (Elsevier BV, 2019-02-01)
Effects of particle size, particle density, gas inlet diameter and static bed height on the stability of operation in conical spouted beds were investigated through analyses of information entropy of pressure fluctuations. In this respect, the maximum information entropy of pressure fluctuations was used as a stability criterion. The results showed that stability of the bed increases with an increase in the maximum entropy. The maximum information entropy of pressure fluctuations increases with increasing p...
The effects of containment on detonation velocity
Souers, PC; Vitello, P; Esen, S; Kruttschnitt, J; Bilgin, Hasan Aydın (Wiley, 2004-02-01)
Reactive flow cylinder code runs on six explosives were made with rate constants varying from 0.03 to 70 mus(-1). Six unconfined/steel sets of original ANFO and dynamite data are presented. A means of comparing confinement effects both at constant radius and at constant detonation velocity is presented. Calculations show two qualitatively different modes of behavior. For U-s/C-0 greater than or equal to 1.2, where U-s is the detonation velocity and C-0 the zero-pressure sound speed in steel, we find a sharp...
EVALUATION OF SECOND VIRIAL COEFFICIENTS FROM SATURATION DATA
Orbey, H.; Orbey, N. (Informa UK Limited, 1989-3)
A data reduction technique is introduced for the evaluation of second virial coefficients of gases at subcritical temperatures. The method makes use of the vapor-liquid equilibrium data, i.e., temperature, saturation pressure, liquid and vapor molar volumes and can be used to obtain second virial coefficients of a wide variety of fluids including polar, associating and quantum gases. The calculated second virial coefficients are in good agreement with their counterparts from literature, which are obtained f...
The use of non-parametric tests between subsamples and particle population for the assessment of minimum number of particles in microscopic analysis
Camalan, Mahmut (Informa UK Limited, 2020-08-01)
The use of small and reliable samples in a microscopic analysis can decrease the time to estimate the particle size and mineral grade distributions in a population of particles. This paper attempts to assess the minimum reliable sample size for the above-mentioned distributions, by implementing non-parametric tests on the subsamples taken from a specific population of 2800 particles. The Kolmogorov-Smirnov tests show that the subsamples which contain more than 800 particles (29% of the population) cannot gi...
Citation Formats
I. Aksahin, İ. Eroğlu, and H. Yucel, “The effect of adsorption on mass transfer in fluidized bed catalytic reactors,” CANADIAN JOURNAL OF CHEMICAL ENGINEERING, pp. 42–53, 2001, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/56799.