Table 2 Pre-treatment conditions and outcomes for the supercritical fluid pre-treatment of corn stover
Types of biomass | Pre-treatment condition | Outcomes of pre-treated corn stover | Year | Refs |
|---|---|---|---|---|
Corn stover | 160–200 °C, 13–17 MPa, 40–80 min, water:ethanol as co-solvent | Removal of lignin reached to 90.05% and increased the enzyme accessibility | 2013 | [69] |
Corn stover | 120 °C, 1450 psi, 30 min, ethanol as co-solvent | Increased sugar yield of 2 mm and 4 mm particles at a higher pressure, but decreased sugar yield of 1 mm as pressure increased | 2018 | [70] |
Corn stover, corn cob, and sorghum stalk (75% moisture) | 50–80 °C, 17.5–25 MPa, 12–60 h | Pre-treatment significantly reduced the temperature from 160–170 to 50–80 °C and increased the enzyme accessibility 3- or fourfold compared to unpretreated | 2019 | [68] |
Corn straw (10.7% moisture) | 170 °C, 5 MPa, 40 min | Enhanced enzyme hydrolysis with little lignin degradation | 2019 | [71] |