• Silicon carryover into coker naphtha
  • Reduced catalyst life
  • Reduced silicon carryover approximately 75%
  • Decreased silicon defoamer usage by 70%
  • Improved refinery operations
  • Extended catalyst life
  • Maintained coke drum foam control

Case study details

A Gulf Coast refinery experienced high silicon antifoam usage (approximately 1 lb [0.5 kg] of silicon per thousand barrels) at the coker while using 60,000-cSt antifoam. This usage rate was well above the refining group’s other locations, which used approximately 0.25 lb of silicon per thousand barrels.

As a result, a higher than desired amount of silicon was being carried over into the coker naphtha. In addition, high concentrations of silicon were also found in the coker scrubber slop streams that were reprocessed at the pipestills.

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