Removing diolefins from coker naphtha necessary before hydrotreating

Syncrude Canada Ltd.'s Edmonton Research centre carried out hydrotreating pilot plant tests with coker naphtha over a typical alumina-based NiMo catalyst to investigate process variables for removal of olefins, diolefins, aromatics, sulfur, and nitrogen.The removal of diolefins from the coker naphtha before naphtha hydrotreating is essential to making a high quality product.At high reactor-bed temperatures such as those found in hydrotreating, diolefins tend to polymerize and cause fouling.Tests were also conducted on increasing the reactor temperature stepwise until the reactor plugged due to polymerization of diolefins. It was found that diolefins and aromatics can be removed at rel...

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