Dehydrator issues in hydrocracking
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The VGO from the irrigation area in our plant needs to pass through a dehydrator, whereas the VGO from the pressure reduction unit does not need to go through a dehydrator. Why is that?
The VGO temperature in the tank area is not high enough, and water tends to accumulate in the tanks (due to the condensation of various steam used for cleaning). In contrast, the VGO temperature in the pressure reduction unit is high enough, so there is basically no water present.
Oh, thank you! I’ve learned a little more
So that’s how it is; I’ve learned it! ! ! :handshake
It should be the difference between dissolved water and free water; free water is generated after the VGO in the tank area is cooled, while the VGO in the atmospheric and vacuum distillation units contains dissolved water. What the hydrocracking reaction system fears is free water; a concentration of a few hundred ppm of dissolved water is acceptable.