Reformulation problem, please help, experts!
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Due to corrosion of the steam heating tube in the chlorine injection tank, water entered the tank, which resulted in hyperchlorination; the temperature dropped significantly, the purity of hydrogen decreased, and the oil turned yellow. Can’t water be used to remove chlorine? How can one undergo chlorination? The octane number of the reformed oil has not decreased, but its specific gravity has increased. What reaction is responsible for this increase in specific gravity? Is the formation of the catalyst’s acidic centers dependent on water? If there is little water, it cannot be formed; moreover, no matter how much chlorine is added, the acidity will not be strong?
The acidic center is OH-, and Cl enhances the acidity of this center; meanwhile, water helps to distribute Cl more evenly. It’s just my personal understanding; I’m not sure if it’s correct
I guess the chlorine that was added earlier didn’t effectively form acidic centers; there was a lack of water, is that correct?
Excessive water presence occurs in two stages: in the initial stage, an increase in water leads to an increase in hydroxyl groups on the catalyst carrier, thereby enhancing acidity, which results in more cracking reactions, an increase in liquefied gas production, a decrease in hydrogen production and reaction temperature, as well as a reduction in the yield of oil products； An increase in water washes away the chlorine on the catalyst, reducing its acidity; as a result, hydrogen production from reforming increases, liquefied gas production decreases, and the yield of reformate increases, but the content of aromatic compounds and the octane number of the produced oil decrease. I believe the increase in specific gravity is caused by the coking reaction.
What generally promotes the coking reaction? Which function, acidic or metallic, promotes coking more?
There is an imbalance in the ratio of water to chlorine. The cause seems to be an excess of water; when it’s too humid, symptoms related to excessive chlorine appear at the initial stage. Later, the water washes away the chlorine, resulting in symptoms of chlorine deficiency
So what should be done in this situation? If chlorine injection is reduced during the period of hyperchlorination, will chlorine deficiency occur again immediately?
The water-chlorine balance is a challenge in reforming; it is a slow adjustment process that takes a long time. It’s not advisable to add water or chlorine too quickly – one must proceed slowly. I can’t explain this clearly either; it’s similar to the situation with the fluidization of catalytic cracking catalysts, which is also difficult to explain clearly
Rebalancing the water-chlorine balance is not free water. It’s water from anhydrous ethanol; I’m not sure if the water content in your gas has increased. If it has, the catalyst will be damaged