Patent ID: 9556558
Date: 2017-01-31
CPC Classifications: D21B,D21C,D21H

Claim:
1. A process for producing a paper product from biomass, said process comprising: (a) providing lignocellulosic biomass comprising cellulose, hemicellulose, and lignin; (b) digesting said biomass in the presence of steam and/or hot water to generate an intermediate pulp material and a liquid phase, wherein said liquid phase contains extracted hemicelluloses and lignin; (c) evaporating said liquid phase to remove volatile components, thereby generating a solids-enriched liquid phase; (d) mechanically refining said intermediate pulp material, to generate a refined pulp material; and (e) introducing said refined pulp material, said solids-enriched liquid phase, and optionally a separate solid material to a paper machine, to produce a paper product, wherein said process further comprises washing said liquid phase from said intermediate pulp material using an aqueous wash solution, to generate an intermediate pulp material wash filtrate, and evaporating said intermediate pulp material wash filtrate to remove volatile components, thereby generating a solids-enriched intermediate pulp material wash filtrate; wherein said solids-enriched intermediate pulp material wash filtrate is introduced to said paper machine.