A catalyst free
organosolv process for a more efficient delignification and bio-product production by fractionating lignocellulosic materials comprises of providing one or more
lignin dissolving chemicals with water and placing it in contact with
lignocellulosic biomass. The process also includes producing used
solvent as a result of placing
biomass in contact with
lignin dissolving chemicals and water, separating it into organic and aqueous
layers, extracting poly
lignin from the
organic layer to produce recyclable lignin dissolving chemicals, and extracting dissolved
solid from the aqueous layer to produce recyclable water. The catalyst free
organosolv process can use any combination of fresh, used, or recyclable water and lignin dissolving chemicals, with or without any pH adjustment and placing them in contact with any
biomass in process, or any new
biomass. The recyclable lignin dissolving chemicals can be further separated to remove any excess or desired
organic chemicals from it. The separated chemicals can be recycled as new lignin dissolving
solvent or sold, while poly lignin can be used as a natural and renewable colorant for other polymers such as poly
lactic acid, or can be mixed with other polymers as an additive and be compounded, co-extruded, injected to make consumable polymeric parts, or can be used as a
natural source of renewable aromatics. Application of the catalyst free
organosolv process helps to preserve
fiber strength which is important for certain applications. At the end, the catalyst free organosolv
fractionation process produces good quality fibers, various
organic chemicals, and poly lignin that together make the process very economically attractive.