Processes for washing a spent ion exchange bed and for treating biomass-derived pyrolysis oil, and apparatuses for treating biomass-derived pyrolysis oil

A process for treating biomass-derived pyrolysis oil comprising a metal ion component and having an original oxygen content, said process comprising the steps of:

• pyrolyzing a biomass feed in a pyrolysis reactor to form a biomass-derived pyrolysis vapor stream;
• condensing at least a portion of the biomass-derived pyrolysis vapor stream in a condensing system to form a biomass-derived pyrolysis oil stream;
• passing the biomass-derived pyrolysis oil stream through an ion exchange bed to form an ion-depleted pyrolysis oil stream;
• partially hydrotreating the ion-depleted pyrolysis oil stream in a hydrotreating device to reduce the oxygen content thereof, thereby producing a partially hydrotreated pyrolysis oil stream having a residual oxygen content that is less than the original oxygen content;
• passing at least a portion of the partially hydrotreated pyrolysis oil stream through the spent ion exchange bed;
• and
• passing water through the spent ion exchange bed after passing at least the portion of the partially hydrotreated pyrolysis oil stream therethrough.