The principle of cracking catalyst selection

The principle of cracking catalyst selection:

There are many types of cracking catalysts. How to choose the appropriate catalyst according to the needs and specific conditions is a problem that must be carefully considered. 

Generally speaking, there are several principles to refer to:

(1) When the proportion of blending residue oil increases, REHY or even USY type catalyst should be used. 

If the heavy metal content of the feed oil is high, a USY type catalyst with a substrate with a small surface area should be used.

(2) When the required product scheme changes from the maximum light oil yield to the maximum octane number-barrel and even the maximum gasoline octane number, 

the catalyst selection also changes from REY to REHY and even USY type catalysts accordingly.

(3) The catalyst is selected according to the specific conditions of the existing device, especially the restrictive conditions. 

For example, when the load of the regenerator is relatively tight, REHY or USY catalysts with excellent coke selectivity should be used; 

when the catalyst circulation is restricted, that is, when the ratio of catalyst to oil is restricted, REHY or even REY with high activity should be used. type catalyst.