Integrated process for hydrotreating a renewable feedstock with improved carbon monoxide management

A process for hydrotreating a renewable feedstock comprising:

• combining a hydrocarbon feedstock and the renewable feedstock to form a combined feed;
• hydrotreating the combined feed in the presence of a hydrogen stream in a hydrotreating reactor under hydrotreating conditions to produce a hydrotreated effluent stream;
• adding water to the hydrotreated effluent stream;
• passing the hydrotreated effluent stream through a hot separator to flash a vapor stream, wherein the water is added to the hydrotreated effluent stream upstream of the hot separator;
• contacting the vapor stream with a water gas shift catalyst under water gas shift reaction conditions located in the hot separator above the inlet to the hot separator to produce a shift catalyst effluent stream, wherein the water gas shift catalyst includes copper and zinc oxide;
• passing the shift catalyst effluent stream to a cold separator to recover a cold vapor stream and a cold liquid stream comprising diesel;
• passing the cold vapor stream to a recycle gas scrubber for the removal of hydrogen sulfide and carbon dioxide to produce a recycle hydrogen stream;
• and
• recycling the recycle hydrogen stream having reduced concentration of hydrogen sulfide and carbon dioxide to the hydrotreating reactor.

A process for hydrotreating a renewable feedstock comprising:

• combining a hydrocarbon feedstock and the renewable feedstock to form a combined feed;
• hydrotreating the combined feed in the presence of a hydrogen stream in a hydrotreating reactor under hydrotreating conditions to produce a hydrotreated effluent stream;
• cooling the hydrotreated effluent stream to provide a cooled hydrotreated effluent stream;
• contacting the entire cooled hydrotreated effluent stream directly with a water gas shift catalyst under water gas shift reaction conditions to produce a shift catalyst effluent stream, wherein the water gas shift reaction is operated at a lower temperature than the hydrotreating reaction;
• passing the shift catalyst effluent stream to a cold separator to recover a cold vapor stream and a cold liquid stream comprising diesel;
• passing the cold vapor stream to a recycle gas scrubber for the removal of hydrogen sulfide and carbon dioxide to produce a recycle hydrogen stream;
• and
• recycling the recycle hydrogen stream having reduced concentration of hydrogen sulfide and carbon dioxide to the hydrotreating reactor.