In an earlier report, made some years ago:
Exxon Co-Gasifies Coal and Carbon-Recycling Biomass | Research & Development | News; concerning: "United States Patent Application 20100083575 - Co-gasification Process for Hydrocarbon Solids and Biomass; April, 2010; Inventors: Ramesh Varadaraj, et. al., NJ; Assignee: ExxonMobil Research and Engineering Company, NJ; Abstract: A process for the co-gasification of carbonaceous solids (coal) and biomass in which the biomass material is pyrolyzed to provide a biomass pyrolysis oil and biomass char or coke which are then mixed with the carbonaceous solid to form a slurry. This slurry is then heated if necessary to achieve a viscosity which can be processed conveniently in the gasifier. The heat required for pyrolyzing the biomass can conveniently be obtained from the heat exchanger used to cool the hot synthesis gas product emerging from the gasifier. Claims: A process for forming a slurry feed for the gasification to synthesis gas of solid carbonaceous particles and solid biomass ... wherein the solid carbonaceous particles comprise coal (or) a coke derived from coal (and) wherein the biomass comprises biological matter selected from wood, plant matter, municipal waste, green waste, byproducts of farming or food processing waste, sewage sludge, black liquor from wood pulp, and algae";