Delayed coker antifoam reduced silicon carryover, solved refinery operating problem

A US West Coast refinery using 600,000-cSt antifoam in their delayed coker was experiencing higher than desired silicon carryover in the streams exiting the main fractionator. The base case coker liquid product samples collected at identical periods in the drum cycle showed silicon levels of 20.0, 4.5, and 2.5 ppm in coker naphtha, light coker gas oil (LCGO), and heavy coker gas oil (HCGO), respectively. The silicon carryover was negatively impacting catalyst life in the downstream hydrotreaters.

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