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Catalyst Grading and Regeneration
Type/Size
graded catalyst reactor loading schemes are more and more used to optimize
reactor performances (improvement of liquid distribution, decreasing the
risk of delta P occurrence, specific reactions sections) and to extend
the catalyst life (guard beds).
Reactor loading schemes are becoming more and more complex, and particular
care must be taken when drawing a new reactor loading scheme.
Because the various catalyst types can be mixed up during reactor unloading, it is recommended to carefully study the size grading scheme in order to avoid irreversible catalyst mixtures, that could prevent the catalyst to be regenerated, or lead to poorer performances after regeneration.
| Examples of mixture | Effects |
| Inert material mixture | Poorer feed distribution |
| Inerts/catalyst | Less activity/poorer distribution/delta P |
| Contaminated catalyst/clean catalyst | Activity decrease |
| NiMo/CoMo | Overall performance decrease/gum formation |
| Mixture between beds | Performance/catalyst life decrease |
EURECAT offers various services/advises around catalyst loading, unloading, selection to prevent unwanted mixtures of catalyst.
On the other hand, EURECAT also offers second hand make up catalyst from different sizes that can be sent back together with regenerated catalyst main batch to re-compose original loading schemes.