An examination of the isothermal pellet assumption relative to the design of nonadiabatic fixed bed catalytic reactors
✍ Scribed by Thomas Gordon Smith
- Publisher
- Elsevier Science
- Year
- 1977
- Tongue
- English
- Weight
- 992 KB
- Volume
- 32
- Category
- Article
- ISSN
- 0009-2509
No coin nor oath required. For personal study only.
✦ Synopsis
The accuracy of the Isothermal pellet assumption was evaluated by using this assumption to solve a two dimensional nonadlabatlc fixed bed catalytic reactor model for typical sets of Inlet operatmg conditions Subsequently, for a series of axlal pomts along the reactor centerline, local reactor condmons were recorded and applred to the solution of the complete pellet matenal and energy balance equations Local effectiveness and point yields were then compared for the two methods Results mdlcate that the Isothermal pellet assumption LS vahd for small pellets (-0 15 cm) regardless of the magmtude of the dtiuslvdy For large pellets on the order of 0 5 cm, particularly those havmg low surface areas, the use of the Isothermal pellet assumption can lead to s~gmticant errors m converSIon and yield The results also suggest that the occurrence of multiple steady states m the catalyst of an mdustrlal non-adlabatlc fixed bed reactor 1s unhkely The conclusions are shown to be fairly general, encompassing a range of feasible operating conditions INTRODUCTlON