A method for generating a solid wood-based material and a hemicellulose-derived material from a wood raw material, said method comprising; i) steam treating, or steam exploding, the wood raw material whereby to generate a hemicellulose-containing fluid component and a solid wood-based material comprising a steam treated wood material; said method comprising the steps of a) introducing the wood raw material into a pressure vessel; b) heating the wood raw material by injecting steam and keeping the temperature at 150 - 280° C for a period of 60 - 2400 seconds; c) reducing the pressure in one or more steps and removing the exploded wood material out of the vessel; ii) separating said fluid component from said solid component; iii) processing at least a part of said solid component into a solid wood-based material; and iv) processing said liquid component into a hemicellulose-derived material, comprising filtration of the fluids fraction in at least two steps; I) A first separation step removing particles and/or insoluble material, after which the liquid component is retained; and II) A second filtration step comprising ultrafiltration or nanofiltration of said liquid component, in which the concentration of hemicellulose in the filtrate is increased; wherein the concentration of dissolved material in the filtrate after the last filtration is above 10%. i) steam treating, or steam exploding, the wood raw material whereby to generate a hemicellulose-containing fluid component and a solid wood-based material comprising a steam treated wood material; said method comprising the steps of a) introducing the wood raw material into a pressure vessel; b) heating the wood raw material by injecting steam and keeping the temperature at 150 - 280° C for a period of 60 - 2400 seconds; c) reducing the pressure in one or more steps and removing the exploded wood material out of the vessel; a) introducing the wood raw material into a pressure vessel; b) heating the wood raw material by injecting steam and keeping the temperature at 150 - 280° C for a period of 60 - 2400 seconds; c) reducing the pressure in one or more steps and removing the exploded wood material out of the vessel; ii) separating said fluid component from said solid component; iii) processing at least a part of said solid component into a solid wood-based material; and iv) processing said liquid component into a hemicellulose-derived material, comprising filtration of the fluids fraction in at least two steps; I) A first separation step removing particles and/or insoluble material, after which the liquid component is retained; and II) A second filtration step comprising ultrafiltration or nanofiltration of said liquid component, in which the concentration of hemicellulose in the filtrate is increased; wherein the concentration of dissolved material in the filtrate after the last filtration is above 10%. I) A first separation step removing particles and/or insoluble material, after which the liquid component is retained; and II) A second filtration step comprising ultrafiltration or nanofiltration of said liquid component, in which the concentration of hemicellulose in the filtrate is increased; <EOS>