A method for extracting lignin from biomass
A technology of lignin and biomass, applied in papermaking, textile and papermaking, fiber raw material processing, etc., can solve the problems of unfavorable organic solvent recycling, difficulty in lignin extraction, unfavorable lignin depolymerization and modification work, etc. The effect of reducing oxidative condensation reaction, increasing penetration and maintaining integrity
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Embodiment 1
[0033] Take 100 g of pulverized poplar wood powder and add it into a three-necked flask filled with 700 mL of dioxane, place the three-necked flask in an ultrasonic instrument with a power of 20 W, and oscillate ultrasonically at a frequency of 30 kHz for 20 min. Take 10g H 3 PO 4 -AC and 50 mL of dimethyl carbonate were added to the flask. The three-necked flask was heated to 120° C., condensed and refluxed for 1 h, and nitrogen was always fed as a protective gas during this period. After the reaction, solid-liquid separation was achieved by suction filtration. The filtrate is concentrated by rotary evaporation, and the evaporated organic solvent can be recycled, and the concentrated solution is dissolved in 200 mL of acetone solution. Then slowly add the acetone solution into 1L of 5°C cold water to precipitate the lignin. Finally, filter, wash, and vacuum dry to obtain lignin. The extraction rate and properties of lignin are shown in Table 1.
Embodiment 2
[0035] Take 100 g of pulverized poplar wood powder and add it into a three-necked flask containing 1000 mL of dioxane, place the three-necked flask in an ultrasonic instrument with a power of 40 W, and oscillate ultrasonically at a frequency of 30 kHz for 20 min. Take 10g H 3 PO 4 -AC and 70 mL of dimethyl carbonate were added to the flask. The three-necked flask was heated to 120° C., condensed and refluxed for 1 h, and nitrogen was always fed as a protective gas during this period. After the reaction, solid-liquid separation was achieved by suction filtration. The filtrate is concentrated by rotary evaporation, and the evaporated organic solvent can be recycled, and the concentrated solution is dissolved in 200 mL of acetone solution. Then slowly add the acetone solution into 1 L of cold water (1° C.) to precipitate lignin. Finally, lignin was obtained by filtering, washing, and vacuum drying. The extraction rate and properties of lignin are shown in Table 1.
Embodiment 3
[0037] Take 100 g of pulverized poplar wood powder and add it into a three-necked flask filled with 700 mL of dioxane, place the three-necked flask in an ultrasonic instrument with a power of 20 W, and ultrasonically vibrate at a frequency of 20 kHz for 20 min. Take 10g H 3 PO 4 -SiO2 and 50 mL of dimethyl carbonate were added to the flask. The three-necked flask was heated to 120° C., condensed and refluxed for 1 h, and nitrogen was always fed as a protective gas during this period. After the reaction, solid-liquid separation was achieved by suction filtration. The filtrate is concentrated by rotary evaporation, and the evaporated organic solvent can be recycled, and the concentrated solution is dissolved in 200 mL of acetone solution. Then slowly add the acetone solution into 1L of 4°C cold water to precipitate the lignin. Finally, lignin was obtained by filtering, washing, and vacuum drying. The extraction rate and properties of lignin are shown in Table 1.
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