Mixing effects on performance and stability of low-density polyethylene reactors
| Autor: | Gary J. Wells, W. Harmon Ray |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
Work (thermodynamics)
Engineering drawing Environmental Engineering Chain propagation business.industry Chemistry General Chemical Engineering Mechanics Computational fluid dynamics Stability (probability) Autoclave Low-density polyethylene Volume (thermodynamics) business Mixing (physics) Biotechnology |
| Zdroj: | AIChE Journal. 51:3205-3218 |
| ISSN: | 0001-1541 |
| DOI: | 10.1002/aic.10544 |
| Popis: | Imperfect initiator mixing greatly affects the stability and efficiency of low density polyethylene (LDPE) autoclave reactors. A combined simulation technique utilizing compartment models and computational fluid dynamics extends previous work in the literature by providing a physically detailed picture of imperfect mixing. Analysis indicates that the effective volume for chain propagation in the autoclave reactor can expand and contract in a continuous fashion as operating conditions change. As mixing becomes poor, the effective reactive volume decreases, causing a reduction in initiator efficiency, but an expansion in the stable operation region. Examples demonstrate that accurate prediction of the effective reaction volume is crucial for predicting LDPE autoclave reactor behavior. A new mixing model that represents the feed plume by a series of interconnected tanks with geometrically increasing volumes provides a favorable tradeoff between accuracy and model complexity. © 2005 American Institute of Chemical Engineers AIChE J, 2005 |
| Databáze: | OpenAIRE |
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