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Mercaptans are acidic sulfur compounds which are naturally present in crude oil. Moreover, a large amount of mercaptans results from the decomposition of other sulfur compounds during crude distillation and cracking operations.

Mercaptans are undesirable for the two following reasons:

  • In order to respect EuroV specification, mercaptans quantities shall be limited.
  • Mercaptans are acidic corrosive compounds which have to be neutralized to protect engines.

This process will selectively convert the acidic mercaptans to neutral disulfides in order to pass the copper strip, doctor test. Heavy sulfur molecules like thiophenes cannot be efficiently removed or transformed by caustic. As a consequence, light naphtha notably from FCCU and H-Oil® are usual feedstocks for a Sweetn'G  process. As a result, the unit scheme is adapted for each client and associated objectives such as meeting gasoline pool sulfur constraints.

Sweetn'G  combines advantages of Sulfrex  and Sweetn'K  technologies thanks to an optimized caustic management and without mandatory proprietary equipment. This results in a lower initial investment as well as low operating cost.

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