Methods for deoxygenating biomass-derived pyrolysis oil

A method for deoxygenating a biomass-derived pyrolysis oil, the method comprising the steps of:

• combining a biomass-derived pyrolysis oil stream that has an initial temperature of about 100° C. or less with a heated low-oxygen-pyoil diluent recycle stream to form a heated diluted pyoil feed stream that has a feed temperature of about 150° C. or greater;
• and
• introducing the heated diluted pyoil feed stream to a hydroprocessing reactor that contains a deoxygenating catalyst in the presence of hydrogen including contacting the heated diluted pyoil feed stream with the deoxygenating catalyst at hydroprocessing conditions that include a reaction temperature of about the feed temperature effective to partially deoxygenate the heated diluted pyoil feed stream and form a low-oxygen biomass-derived pyrolysis oil effluent.

A method for deoxygenating a biomass-derived pyrolysis oil, the method comprising the steps of:

• combining a biomass-derived pyrolysis oil stream with a heated low-oxygen-pyoil diluent recycle stream to form a heated diluted pyoil feed stream that has a feed temperature of about 150° C. or greater, wherein the biomass-derived pyrolysis oil stream comprises a first organic phase that has a first residual oxygen content of about 10 wt. % or greater of the first organic phase, and wherein the heated low-oxygen-pyoil diluent recycle stream comprises a second hydroprocessed organic phase that has a second residual oxygen content of from about 5 to about 25 wt. % of the second hydroprocessed organic phase;
• and
• introducing the heated diluted pyoil feed stream to a first hydroprocessing reactor that contains a first deoxygenating catalyst in the presence of hydrogen at first hydroprocessing conditions effective to partially deoxygenate the heated diluted pyoil feed stream and form a low-oxygen biomass-derived pyrolysis oil effluent that comprises a third hydroprocessed organic phase that has a third residual oxygen content of from about 5 to about 25 wt. % of the third hydroprocessed organic phase.