What is the role of acidic water and crude light oil at the outlet of the riser in a catalytic reactor?
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What is the role of acidic water and crude light oil at the outlet of the riser in a catalytic reactor?
A terminator, to prevent the occurrence of a secondary reaction!
Isn’t the riser outlet temperature controlled by a slide valve?
It is controlled by a slide valve, and the purpose of injecting an terminator is to prevent excessive cracking through the catalyst circulation rate.
Used as a terminator. It reduces unnecessary secondary reactions, and can also relatively increase the reaction depth and reagent-to-oil ratio of the reactor after initial feeding.
You mean a temperature drop, but isn’t the temperature controlled by a slide valve?
Terminate unnecessary secondary reactions while ensuring the circulation rate
When a terminator is injected, it causes the reaction to stop, and the reaction temperature drops rapidly, bringing the reaction to an end. Therefore, it inevitably causes the regenerative spool to open, greatly increasing the oil-to-agent ratio. Of course, using a terminator also has its drawbacks; for example, it increases the amount of coking and raises the load on the top of the distillation tower. It can be used in appropriate amounts only when the load at the top of the distillation tower and the capacity of the compressor allow it. Moreover, it’s not true that the larger the terminator, the better – its amount needs to be determined based on the product distribution and the level of coking. In any case, we tried using it at first, but stopped when we saw that it didn’t yield good results.
Yes, it is to prevent secondary reactions; mainly, it is to avoid excessive reactions and to increase the depth of reaction as well as the distribution of the product