Grading is great - overgrading is not

Getting the most out ofwhat you’ve got

Grading is all about getting the most out of the all-important bulk catalyst in your reactor setup. The right grading configuration is the most effective “preventive measure” and the ultimate adjustment knob.

这是一个余额问题，利用您使用的批量催化剂的全部有效性，并使用评分来保护其免受导致成本高昂的污染和堵塞pressure dropor premature catalyst deactivation.

Too little grading – not enough protection

如果您不加载足够的分级（具有正确的规格和配置），您将无法过滤掉原料中的所有讨厌的东西 - 并且您的散装催化剂将迅速受到污染。

不足和/或无效的分级，您可能最终可能会履行昂贵的关闭waytoo soon.

Too much grading – not enough benefit from your bulk catalyst

Conversely, with the kinds of feedstocks that many refineries now have to deal with, e.g. renewable feedstocks or opportunity crudes, featuring large amounts of contaminants difficult to deal with, we see a growing tendency to use more and more grading as a protective measure.

But if you usetoo muchgrading, you’ll end up missing out on the full potential of the unit, as the excess grading material takes up the space from the bulk catalyst.

Finding the right balance for your exact needs

If you are processing an easy straight run and there are no obvious corrosion issues, there is no reason for grading material to take up space that you can put to better use for the workhorse in your reactor – the bulk catalyst.

In order to get the maximum cycle length out of your catalyst loading, the right balance between bulk catalyst and grading is crucial. If too little grading is loaded, the cycle will be shortened by premature catalyst poisoning or too high pressure drop (top). If too much grading is loaded, the unit will be limited by activity of the bulk catalyst before the grading capacity has been fully utilized (middle). With the right balance, you obtain the optimal (bottom).

It’s all a question of balancing the specifics of your operation’s particular feedstocks, budgets, practical challenges, and operating profiles. Our aim is to enable you to maximize catalyst cycle length and make sure the pressure drop across your reactor doesn’t limit throughput until the activity of the bulk catalysts has reached the scheduled End-Of-Run (EOR).