## Abstract In the present study, a comprehensive mathematical model is developed for the freeβradical polymerization of styrene to predict the polymerization rate and the molecularβweight distribution of the polymer. The kinetic model accounts for both chemical and thermal radical generation and,
Model reduction and kinetic parameters identification for the methanol conversion to olefins
β Scribed by Gheorghe Maria; Ovidiu Muntean
- Publisher
- Elsevier Science
- Year
- 1987
- Tongue
- English
- Weight
- 833 KB
- Volume
- 42
- Category
- Article
- ISSN
- 0009-2509
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β¦ Synopsis
In order to reduce a complex kinetic model (33 reactions), which describes the methanol conversion to olefins, to a model easier to use, the discretization procedure combined with the integral procedure and ridge regression analysis were used. Because few experimental data are available, new points were generated using either the cubic spline approximation, or the extended mode1 prediction, identified with a nonlinear regression procedure. The latter alternative, although it requires more computational effort, is also recommended for a subsequent kinetic analysis. The final refinement of the simplified model parameters may be accomplished by a multimodal optimization procedure.
π SIMILAR VOLUMES
The thermal degradation of both low-density polyethylene (LDPE) and high-density polyethylene (HDPE) have been investigated under non-isothermal conditions. The weight loss data have been analyzed by Flynn and Wall methods. The activation energies for overall degradation of LDPE and HDPE were determ