Co-processing solid biomass in a conventional petroleum refining process unit
View Patent ↗Preparing solid biomass particles for catalytic conversion includes agitating solid biomass particles and providing a biomass-catalyst mixture to a conventional petroleum refinery process unit. The biomass-catalyst mixture includes the solid biomass particles and a catalyst. Agitating solid biomass particles includes flowing a gas to provide a velocity to at least a portion of the solid biomass particles sufficient to reduce their sizes. Co-processing a biomass feedstock and a conventional petroleum feedstock includes liquefying at least a portion of a biomass-catalyst mixture and co-processing at least a portion of the liquefied biomass feedstock and a conventional petroleum feedstock in a conventional petroleum refinery process unit. The biomass feedstock includes a plurality of solid biomass particles and a catalyst, which is liquefied to produce a liquefied biomass feedstock.
1. A method for co-processing a biomass feedstock and a conventional petroleum feedstock comprising:
liquefying at least a portion of a biomass-catalyst mixture comprising a plurality of solid biomass particles and a catalyst in a first reaction vessel, wherein the plurality of solid biomass particles are substantially characterized by individual sizes below about 1500 microns, to produce a liquefied biomass feedstock; and
co-processing at least a portion of the liquefied biomass feedstock and a conventional petroleum feedstock in a conventional refinery unit.
2. The method of claim 1 , wherein the plurality of solid biomass particles are substantially characterized by individual sizes below about 1000 microns.
3. The method of claim 1 , wherein the plurality of solid biomass particles are substantially characterized by individual sizes below about 500 microns.
4. The method of claim 1 , further comprising:
providing the biomass-catalyst mixture using a first feed system; and
providing the conventional petroleum feedstock using a second feed system.
5. The method of claim 1 , wherein liquefying at least a portion of a biomass-catalyst mixture comprises operating the first reaction vessel at a temperature between about 450 and 250° C.
6. The method of claim 1 , further comprising retaining oxygen in a product stream resulting from the processing of the biomass feedstock, without substantially converting the oxygen to H 2 O, CO, or CO 2 .
7. The method of claim 1 , further comprising selectively converting oxygen in the biomass feedstock, as processed, to H 2 O, CO, or CO 2 by controlling at least one of catalyst type and reaction temperature.
8. The method of claim 1 wherein the liquefied biomass feedstock is between about 5 and about 50 wt % of the combination of the liquefied biomass feedstock and the conventional petroleum feedstock co-processed in the conventional refinery unit.
9. The method of claim 1 wherein the liquefied biomass feedstock is between about 10 and about 20 wt % of the combination of the liquefied biomass feedstock and the conventional petroleum feedstock co-processed in the conventional refinery unit.
10. The method of claim 1 wherein the catalyst is a crystalline alumino-silicate.
11. The method of claim 1 wherein the plurality of solid biomass particles are pre-treated prior to the liquefying step to remove minerals and metals.
12. The method of claim 1 wherein a portion of the solid biomass particles are suspended in either or both of the liquefied biomass feedstock and the conventional petroleum feedstock, and introduced to the conventional refinery unit for co-processing.