Reasons for insufficient temperature drop in catalytic reforming
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This post was last edited by Final Fantasy on 2010-11-3 at 18:03. After replacing the catalyst in my vehicle this year, the temperature drop doesn’t occur once I start driving! I seek the advice of experts.
There are many factors that influence the temperature drop during reforming. For example, the potential aromatic content of the feedstock used in reforming (different compositions of aromatic compounds result in different temperature drops), the hydrogen-to-oil molecular ratio, the reaction temperature, as well as the cut point for the distillates. In fact, the technical performance of a reforming process cannot be evaluated based solely on the temperature drop; other indicators such as the yield of pure hydrogen, the octane number or aromatic content of the produced oil, the conversion rate of aromatics, and the yield of aromatics are also important.
The main reasons may be as follows: 1. Catalyst poisoning and deactivation. 2. The catalyst components have changed. 3. Severe catalyst carbon deposition. 4. Changes in reaction temperature, pressure, hydrogen-to-oil ratio, space velocity, environment, etc. 5. Changes in the composition of raw materials. 6. Imbalance of water and chlorine. This post was last edited by A Lone Star in the Desert on 2009-1-19 23:23.]
Fixed bed or moving bed, what catalyst, and by how much is the temperature drop?
In my opinion: 1. There is a problem with the quality of the catalyst； ⒉The catalyst is not being used properly; please seek guidance from the catalyst manufacturer.
Well, the most likely issue is related to the catalyst – its activity has decreased. An increased amount of hydrogen used in the reforming process can also lead to a smaller temperature drop
Most are due to an imbalance in catalyst activity (metallic activity and acidic functionality).
Check the purity of your recycled hydrogen; if it decreases, it’s definitely a catalyst issue – the metal’s functional activity has declined. It could be due to problems with regeneration, or it might be poisoning caused by heavy metals or arsenic. Hopefully it’s the former
There is a high likelihood of sulfur shock during the startup process of the new catalyst; a gradual recovery of temperature can indicate this
If it is a catalyst of the same type, check indicators such as aromatic conversion rate and liquid yield; as long as these meet the requirements, there is no need to keep focusing on the temperature drop.
Changes in raw material composition, sulfur poisoning, catalyst carbon deposition, loss of active components, water-chlorine balance, excessively high dry point of the feed, as well as intentional reduction of reaction severity, can all result in insufficient temperature drop