scholarly journals Aromatization of light naphtha fractions on zeolites 1: Kinetic model

2003 ◽  
Vol 57 (9) ◽  
pp. 399-403 ◽  
Author(s):  
Svetlana Rovenskaja ◽  
Nikolaj Ostrovski
Keyword(s):  
Experimental Data ◽  
Kinetic Model ◽  
Rate Constants ◽  
Reaction Rate ◽  
Reaction Scheme ◽  
Activation Energies ◽  
Modeling And Optimization ◽  
Light Naphtha ◽  
Reaction Rate Constants

On the basis of analyzing kinetic experimental data performed in laboratory integral reactors a lumping kinetic model of the "Zeoforming" process was developed. A reaction scheme of the lumped components was proposed, that was adapted to the technological requirements. The reaction rate constants and activation energies were estimated, that are valid for certain feed compositions. The model is intended for further modeling and optimization of the process.

Simulation of Crosslink and Graft Mechanism of Hydrogenated-NBR/ZINC Di-Methacrylate Composites by Moving Die Rheometer

2002 ◽  
Vol 75 (5) ◽  
pp. 943-954 ◽  
Author(s):  
Takashi Sato ◽  
Akio Fujino ◽  
Sachio Hayashi ◽  
Motofumi Oyama ◽  
Katsumichi Ono
Keyword(s):  
Experimental Data ◽  
Genetic Algorithm ◽  
Rate Constants ◽  
Reaction Rate ◽  
Addition Reaction ◽  
Algorithm Optimization ◽  
Reaction Rate Constants ◽  
Data Comparison ◽  
Graft Reaction ◽  
Comparison With Experimental Data

Abstract This paper studies the crosslink and graft mechanism of hydrogenated-NBR/zinc di-methacrylate (HNBR/ZDMA) composites. The experiments to determine the rate constants of crosslink and graft reaction formulas are from Moving Die Rheometer (MDR) data. Comparison with experimental data and the solution of simultaneous ordinary differential equations for the crosslink and graft reactions are performed. Genetic algorithm optimization of the reaction rate constants allowed for simulation of crosslinking and graft reaction process. This simulation predicts that the HNBR/peroxide cure system will contain 0.1052-mole/l crosslink between matrix HNBR polymer at 2 phr.-peroxide concentration. The crosslink concentration of 0.1052-mole/l is composed of 0.0308-mole/l-addition reaction and 0.0744-mole/l-termination reaction. Moreover, the HNBR/ZDMA cure system contains 0.0148-mole/l graft of poly-ZDMA to HNBR and 0.0903-mole/l crosslink between matrix HNBR polymer at a 2 phr.-peroxide concentration.

STUDIES ON THERMOKINETIC METHODS (Ⅰ) DETERMINATION OF REACTION RATE CONSTANTS AND ACTIVATION ENERGIES BY CALORIMETRY

1986 ◽  
Vol 2 (04) ◽  
pp. 363-370 ◽  
Author(s):  
Xie Changli ◽  
◽  
Xu Quiduan ◽  
Qu Songsheng ◽  
Richard K. Owusu.
Keyword(s):  
Rate Constants ◽  
Reaction Rate ◽  
Activation Energies ◽  
Reaction Rate Constants

scholarly journals Kinetics of the catalytic cracking of naphtha over ZSM-5 zeolite: effect of reduced crystal size on the reaction of naphthenes

2014 ◽  
Vol 4 (12) ◽  
pp. 4265-4273 ◽  
Author(s):  
Hiroki Konno ◽  
Ryota Ohnaka ◽  
Jun-ichi Nishimura ◽  
Teruoki Tago ◽  
Yuta Nakasaka ◽  
...  
Keyword(s):  
Rate Constants ◽  
Atmospheric Pressure ◽  
Catalytic Cracking ◽  
Reaction Rate ◽  
Crystal Size ◽  
Activation Energies ◽  
Reaction Rate Constants ◽  
Kinetics Of

The catalytic cracking of model naphthenes over ZSM-5 zeolites of different crystal sizes was examined at reaction temperatures ranging from 748 to 923 K under atmospheric pressure, focusing on the associated reaction rate constants and activation energies.

Étude expérimentale et modélisation théorique de la décomposition du radical éthyle

1988 ◽  
Vol 66 (9) ◽  
pp. 2142-2150 ◽  
Author(s):  
Yves Simon ◽  
Jean François Foucaut ◽  
Gérard Scacchi
Keyword(s):  
Experimental Data ◽  
Rate Constants ◽  
Critical Analysis ◽  
Reaction Rate ◽  
Closed Vessel ◽  
Reaction Rate Constants ◽  
Theoretical Approaches ◽  
Lower Limits ◽  
Low Pressures ◽  
Good Agreement

A bibliographical study of the thermal decomposition of the ethyl radical shows that the kinetic parameters for the upper and lower limits of the pressure are rather scattered. This observation explains why we have carried out a new study of this elementary process in the pyrolysis of ethane, around 800 K, in a closed vessel and at pressures of the hydrocarbon varying from 1 to 300 Torr. The experimental results have been treated according to three theoretical approaches: the RRKM theory and two methods proposed by Troe. In each case, an excellent fit of the theoretical curves with the experimental data is obtained, as well as Arrhenius expressions for the reaction rate constants at high and low pressures. A detailed critical analysis of our results as well as those found in the literature shows that as yet there is no good agreement between recent studies on this subject. However, it is possible to present two Arrhenius expressions for the reaction rate constants at high and low pressures; these expressions represent a good compromise for the results obtained by various authors:[Formula: see text][Journal translation]

scholarly journals Aromatization of light naphtha fractions on zeolites: 2. Model of catalyst deactivation

2004 ◽  
Vol 58 (3) ◽  
pp. 104-108 ◽  
Author(s):  
Nikolaj Ostrovski ◽  
Svetlana Rovenskaja ◽  
Genadij Echevski
Keyword(s):  
Rate Constants ◽  
Catalyst Deactivation ◽  
Activation Energies ◽  
Modeling And Optimization ◽  
Light Naphtha ◽  
Deactivation Rate ◽  
Deactivation Kinetics

A model of catalyst deactivation in the "Zeoforming" process was developed. The deactivation rate constants and activation energies were estimated. The role of adsorbed oligomers in the reaction and the deactivation kinetics were examined. The model is intended for further modeling and optimization of the process.

Measurement of the OH Reaction Rate Constants for CF3CH2OH, CF3CF2CH2OH, and CF3CH(OH)CF3

1999 ◽  
Vol 103 (15) ◽  
pp. 2664-2672 ◽  
Author(s):  
Kazuaki Tokuhashi ◽  
Hidekazu Nagai ◽  
Akifumi Takahashi ◽  
Masahiro Kaise ◽  
Shigeo Kondo ◽  
...  
Keyword(s):  
Rate Constants ◽  
Reaction Rate ◽  
Reaction Rate Constants
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