The ethanol organosolv process was simulated using ASPEN Plus. The Non-Random Two Liquid (NRTL) model was chosen to handle non-idealities and the Redlich-Kwong-Soave (RKS) equation of state (EoS) was applied to account for high operating pressures. EFB was specified as per its estimated chemical composition expressed in terms of feedstocks (cellulose, lignin, hemicellulose) specified in Table in Section 3.3 in the results. The National Renewable Energy Laboratory (NREL) database and technical reports were utilised to obtain thermodynamic properties of these feedstock biopolymers. For lignin and cellulose it was assumed that the molecular formula is unchanged after dissolution. Hemicellulose is hydrolysed to xylose due to its thermochemical sensitivity. Furfural degradation products and oligomers of each biopolymer are also expected but are not integrated due to the lack of data.