Several issues regarding pre-hydrogenation in catalytic reforming units
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In a catalytic reforming unit, the top of the desulfurization tower in the pre-hydrogenation unit should operate in full reflux mode. Currently, however, a large amount of vapor is discharged from the top of the tower, and the temperature there is high; as a result, full reflux cannot be achieved. What is the reason for this? Moreover, the water content and chlorine content in the refined naphtha remain above the specified limits; sometimes they even exceed those in the feed material. I would appreciate some advice from those with more experience
By how much are the water content and chlorine content of the refined oil higher than those of the feedstock? Are there any specific analysis data?
From the perspective of processes and equipment, the process relates to whether there are any deviations in the feeding used for sample preparation; if the feeding is normal, then the issue lies in the activity of the reaction catalyst. Another possibility is a problem with the operation of the stripping tower, and these factors can all be checked one by one. The issue with the equipment angle is usually an internal leak in the heat exchanger.
Failure in dechlorination is due to the inactivation of the high-temperature dechlorinating agent used in the reaction; an excessive amount of water usually indicates that the temperature at the bottom of the stripping tower is too low. To ensure that the reforming feed meets the required standards, it is essential first to ensure proper operation of the stripping tower, with the distillation tower being of secondary importance.
The sampling process has a significant impact on the water content in the refined oil; it is essential to ensure that the sampler circulates properly and that the sampling bottles are airtight, otherwise they are prone to being affected during summer or in humid weather
What does it mean that full reflux cannot be achieved? What about the load at the bottom of the tower?
Is it necessary to configure the desulfurization stripping tower with full reflux? It is relatively difficult to operate, and it easily leads to excessive levels of light naphtha and sulfur in the refined oil