Theoretical modelling of Amoco's gas phase horizontal stirred bed reactor for the manufacturing of polypropylene resins
✍ Scribed by Mike Caracotsios
- Book ID
- 103007908
- Publisher
- Elsevier Science
- Year
- 1992
- Tongue
- English
- Weight
- 478 KB
- Volume
- 47
- Category
- Article
- ISSN
- 0009-2509
No coin nor oath required. For personal study only.
✦ Synopsis
Rigorous theoretical treatment of Amoco's gas phase horizontal stirred bed reactor has led to the development of a mathematical model that closely follows the behavior of the commercial reactor over a wide range of operating conditions. The modeling equations derive from a fund+ mental kinetic mechanism of the propylene/ethylene polymerization over Amoco's proprietary Ziegler-Natta based supported catalyst. The primary outputs of the model are the continuous polymerization yield and the number average molecular weight of the resin. The model accounts for the effects of catalyst deactivation, cocatalyst and chain transfer agents, in this case hydrogen and aluminum alkyl. The flow pattern of the powder inside the horizontal reactor is modelled by a series of continuous stirred tank reactors of equal volume but unequal mean residence times. Constant powder level operation forces the mean residence times to form a strictly monotonically decreasing sequence. This results in an enhancement of the polymerization yield which is expressed as a finite sum of the batch polymerization yield appropriately convolved with the exit age distribution of the poIymer powder inside the horizontal reactor.