Patent ID: 7214720

Claim:
A process for the production of liquid fuels starting from a solid feedstock containing biomass in which: a) the solid feedstock is subjected to a gasification stage so as to convert said feedstock into synthesis gas comprising carbon monoxide and hydrogen, b) the synthesis gas that is obtained in stage a) is subjected to a purification treatment that comprises an adjustment to increase the molar ratio of hydrogen to carbon monoxide, H 2 /CO, up to a predetermined value, c) the purified synthesis gas that is obtained in stage b) is subjected to a conversion stage that comprises the implementation of a Fischer-Tropsch-type synthesis so as to convert said synthesis gas into a liquid effluent and a gaseous effluent, d) the liquid effluent that is obtained in stage c) is fractionated so as to obtain at least two fractions that are selected from the group that consists of: a gaseous fraction, a naphtha fraction, a kerosene fraction and a gas oil fraction, and e) at least a portion of any naphtha fraction obtained in step d) is recycled in gasification stage a).