Patent ID: 8623102

Claim:
Process for hydroliquefaction of biomass selected from algae, lignocellulosic biomass and/or of one or more constituents of lignocellulosic biomass selected from the group comprising cellulose, hemicellulose and/or lignin for producing fuel bases comprising a) a stage of preparation of a suspension of particles of biomass in a solvent, b) a first stage of hydroconversion in the presence of hydrogen of said suspension in at least one reactor containing an ebullating bed catalyst and operating at a temperature comprised between 300° C. and 440° C., at a total pressure comprised between 15 and 25 MPa, at an hourly mass velocity comprised between 0.1 and 5 h −1 and at a hydrogen/feed ratio comprised between 0.1 and 2 Nm 3 /kg, c) a second stage of hydroconversion in the presence of hydrogen of at least a proportion of effluent obtained in stage b) in at least one reactor containing an ebullating bed catalyst and operating at a temperature comprised between 350° C. and 470° C., at a total pressure comprised between 15 and 25 MPa, at an hourly mass velocity comprised between 0.1 and 5 h −1 and a hydrogen/feed ratio comprised between 0.1 and 2 Nm 3 /kg, and wherein the temperature of the second hydroconversion stage is at least 10° C. higher than that of the first hydroconversion stage.