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• 1) Increasing of the water content (H2O) of the Heavy Naphtha in the Storage Tanks .. and the moisture in the Recycle Gas . What are the causes??

  2) If the required concentration of chlorine (Cl) in the feed is (2 ppm).
  Provided that: Unit capacity (Reforming Unit) = 40 m³/hr (Density of Heavy Naphtha= 0.742 gm/cc ; Density of PDC (Propelene Dichloride C3H5Cl2) added = 1.15 gm/cc )

  So, what's the amount of PDC to be added so that we obtain the above concentration (2 ppm)??

  Dec-2022

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Answers

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• Marcio Wagner da Silva, Petrobras, marciows@petrobras.com.br

  I'm understanding that the heavy naphtha is fed to a catalytic reforming unit and was observed higher water content in the feedstock tank of the unit recently. About this issue it's recommended to check the separation quality in the top vessels of the crude distillation unit, especially the straight run naphtha split column in order to ensure that water is not being dragged to the heavy naphtha and accumulating in the storage tank. The water excess in the naphtha feed can be raising the moisture in the recycle gas.

  Regarding the second question, based on informed data it's necessary to feed close to 95 ml/h of PDC (Propylene Dichloride) to ensure the desired chloride concentration in the feedstock of the catalytic reforming unit.

   

  Jan-2023