How to address catalyst sticking to the wall in continuous reforming
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Our plant is planning to implement continuous reforming; how can the problem of catalyst sticking to the wall be effectively resolved, and is it possible to eliminate this issue entirely?
Mainly, soft coke forms on the catalyst; the reaction depth is too high, resulting in excessive carbon formation on the catalyst； In actual production, by continuously adding a small amount of sulfiding agent over the long term to suppress the catalyst’s activity, it is possible to **reduce the formation of soft coke**. During short interruptions in the operation of the regeneration system, the lower hopper of the last reactor is opened to check for the formation of soft coke, thereby assessing the condition of the catalyst’s soft coke layer. This allows for adjustment of the amount of sulfurizing agent injected; since sulfurizing agents only cause temporary poisoning of the catalyst and reduce the depth of reaction, it is not possible to inject large amounts of them, as this would affect the reaction process and damage the equipment.
Review the design drawings to check whether a sulfur injection facility is installed in the feed to the reforming reaction system; if not, it is recommended to add one. Use high-octane gasoline to dilute the sulfiding agent.
By \"adhesion\" as mentioned by LZ, does it refer to the catalyst being attached to the reactor wall? If such a situation occurs, I agree with what was said above. DMDS is a good vulcanizing agent. Generally, about 1-1.5 ppm mixed into the feed oil should be sufficient. Of course, the specific injection amount also depends on factors such as your feed composition and sulfide content, as well as the reaction temperature and pressure.
I heard that in the material of the vessel wall, Ni needs to be sulfided; otherwise, dehydrogenation will occur, leading to the formation of coke on the vessel wall.
Excluding the factor of coking, the catalyst will not stick to the wall; typical designs include a certain margin of safety. Catalyst sticking to the wall is an issue that must be taken into account when increasing the processing capacity of the plant. The solution is that both UOP and IFP can provide high-density catalysts for modification in order to improve fluidity.
Yes, pass 1PPM of sulfur content in the feed to passivate the reactor surface.