| 摘要 |
Disclosed is a method for producing methane from biomass comprising the steps of: a) hydropyrolyzing biomass in a hydropyrolysis reactor vessel containing molecular hydrogen and a deoxygenating catalyst, producing a hydropyrolysis product comprising char and vapors; b) separating said char from said hydropyrolysis product, producing a reduced char hydropyrolysis product; c) hydroconverting said reduced char hydropyrolysis product in a hydroconversion reactor vessel using a hydroconversion catalyst, producing a hydroconversion product; d) separating from said hydroconversion product condensed liquid water and a gaseous mixture comprising CO2, H2, and methane, wherein said gaseous mixture is free from char; and e) introducing at least a first portion of said gaseous mixture as a feed to a steam reformer, producing reformer CO2 and reformer H2, and f) introducing at least a second portion of said gaseous mixture to a methanation reactor, forming additional methane, wherein both hydropyrolyzing step a) and hydroconverting step c) are exothermic. Further disclosed is a hydropyrolysis process comprising: a) hydropyrolyzing biomass in a fluidized bed hydropyrolysis reactor in the presence of a deoxygenating catalyst and using a hydrogen-containing gas for fluidization to produce a hydropyrolysis product; b) hydroconverting the hydropyrolysis product in a hydroconversion reactor in the presence of a hydroconversion catalyst and hydrogen to produce a hydroconversion product; c) separating condensed liquid water and a gaseous mixture comprising CO2, H2, and methane from the hydroconversion product; and d) introducing at least a first portion of said gaseous mixture to a methane hydrate recovery process to produce a purified methane stream and hydrogen that is recycled to the hydropyrolysis reactor, wherein both hydropyrolyzing step a) and hydroconverting step b) are exothermic. |
