On the deactivation of propylene-producing additives
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I would like to ask the technical personnel in the catalytic cracking unit of refineries: Most of the propylene-producing additives used in these units are modified ZSM-5, and ZSM-5 does not have good hydrothermal stability. I would like to ask how long this propylene-producing additive typically remains active in a catalytic cracking unit before it becomes deactivated Should inactivated catalysts be discarded directly or recycled?
It doesn’t have any durability; it’s similar to a catalyst. Generally, when the energy consumption is 1 KG per ton, it becomes unusable after just over ten hours, and it’s necessary to keep adding it on a daily basis
The amount of additive added is relatively small, and it cannot be separated out on its own; maintaining a certain level of addition during production is sufficient.