General algorithm for evaluation of the kinetic scheme and corresponding kinetic parameters of heterogeneous processes. Applications
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BUDRUGEAC, Petru. General algorithm for evaluation of the kinetic scheme and corresponding kinetic parameters of heterogeneous processes. Applications. In: Central and Eastern European Conference on Thermal Analysis and Calorimetry, Ed. 4, 28-31 august 2017, Chişinău. Germany: Academica Greifswald, 2017, Editia 4, p. 110. ISBN 978-3-940237-47-7.
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Central and Eastern European Conference on Thermal Analysis and Calorimetry
Editia 4, 2017
Conferința "Central and Eastern European Conference"
4, Chişinău, Moldova, 28-31 august 2017

General algorithm for evaluation of the kinetic scheme and corresponding kinetic parameters of heterogeneous processes. Applications


Pag. 110-110

Budrugeac Petru
 
National Institute for Research and Development in Electrical Engineering ICPE-CA, Bucharest
 
Disponibil în IBN: 26 august 2019


Rezumat

The critical analysis of the procedures for evaluation of the kinetic scheme and corresponding kinetic parameters of heterogeneous processes leads us [1, 2] to a general algorithm, which keeps into account the conclusion of ICTAC – 2000 Project [3] and is in agreement with the Workshop at ICTAC 13 [4], and the recent ICTAC Kinetics Committee recommendations for performing kinetic computations of thermal analysis data [5]. According to these, the correct kinetic analysis of nonisothermal data corresponding to a heterogeneous process can be only performed by making use of the experimental data recorded at several heating rates. The algorithm involves the following two steps: (1) the evaluation of the dependence of the apparent activation energy on the conversion degree that is performed by model-free methods, and the use some procedures for determination of the kinetic scheme of investigated process and corresponding kinetic parameters. Additionally, for complex processes (consecutive, parallel, reversible reactions), the results obtained by “multivariate non-linear regression method” should be checked for conversion degree versus temperature or time curves in some temperature programs, other than used in assessing of the kinetic scheme and kinetic parameters. This algorithm has been applied for kinetic analysis of the following processes: thermal dehydrochlorination of PVC, and thermal degradation of HDPE. It has been obtained that dehydrochlorination of the investigated sort of PVC is a single step process, while the thermal degradation of HDPE is a complex process which is satisfactory described from kinetic point of view by three consecutive decomposition reactions. The corresponding values of activation parameters and the analytical form of differential conversion functions have been determined.