NOVELTY - Producing synthesis gas and organic liquid or liquefiable material of value, comprises: providing and subjecting a biomass starting material (1) to decomposition; optionally separating decomposed material into aromatics-enriched fraction (4) (C1) and aromatics-depleted fraction (3) (C2); feeding and reacting the decomposition product (2) or (C1) into dealkylation zone (6) in presence of hydrogen and/or water vapor; separating the discharge to give organic material and stream enriched in components; and partly using the stream enriched in components for producing synthesis gas.    USE - The process is useful for producing synthesis gas.    ADVANTAGE - The process provides: synthesis gas having a high content of carbon monoxide and hydrogen; higher phenol formation, which is more valuable material than oxygen-free aromatics e.g. benzene, and also retains more of the mass of the starting material lignin, hence the process is economical.    DETAILED DESCRIPTION - Producing synthesis gas and at least one organic liquid or liquefiable material of value, comprises: (a) providing a biomass starting material (1); (b) subjecting the biomass starting material to a decomposition; (c) optionally separating the decomposed material obtained in step (b) into at least one aromatics-enriched fraction (4) (C1) and at least one aromatics-depleted fraction (3) (C2); (d) feeding the decomposition product (2) from step (b) or (C1) from step (c) into a dealkylation zone (6) and reacting in the presence of hydrogen and/or water vapor; (e) subjecting a discharge taken from the dealkylation zone to a separation to give at least one organic liquid or liquefiable material of value and at least one stream enriched in components which are more volatile than the organic material of value; and (f) partly using the stream enriched in components which are more volatile than the organic material of value obtained in step (e) for producing synthesis gas.    DESCRIPTION OF DRAWING(S) - The figure shows the process of producing the synthesis gas.    Biomass starting material (1)    Decomposition product (2)    Aromatics-depleted stream (3)    Aromatics enriched stream (4)    Dealkylation zone (6)