Patent ID: 7901663

Claim:
A process for transforming heavy carbonaceous material comprising lignocellulosic biomass, said process comprising the following steps: a) a stream of said biomass in the form of initial solid fragments with a characteristic dimension in the range of 1 to 20 mm is introduced into a liquid L 1 comprising more than 60% by weight of carbon and hydrogen to obtain a polyphase mixture comprising at least one liquid/solid mixture; b) said liquid/solid mixture undergoes a maturation step at a temperature in the range 250° C. to 320° C. for a residence time of at least 10 minutes, to obtain a mixture of solid heat-treated fragments in a liquid L 2 , and optionally a gas G 2 ; c) said solid heat-treated fragments mixed with at least a fraction of liquid L 2 are milled to obtain a suspension of solids having a characteristic dimension of less than 150 micrometres; d) at least a fraction of said suspension of solids undergoes partial entrained bed oxidation (PDX) to produce a synthesis gas (SG).