Method for preparation of aromatic aldehyde by means of waste biomass pretreated with dilute acid and through acetylation
A technology for pretreatment of biomass and acetylation, applied in the fields of environmental protection and new energy, can solve the problems of low utilization efficiency of non-fibrous compounds, and achieve the effect of improving application potential and simple process
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[0021] Example 1
[0022] Pretreatment steps: dry the waste straw, shear and grind it to a size of 180 mesh, take 5g of biomass powder and 25mL of 0.5% phosphoric acid solution, mix and stir to prepare a slurry, and pour it into a 250mL airtight high-pressure reactor. While stirring, the temperature was raised to 50° C., kept for 0 min, tap water was passed to cool to room temperature, and the reaction mixture was poured out. The reaction mixture was suction filtered, and the solid phase was collected and dried. Weigh 3g of the solid phase pretreated with phosphoric acid, acetic acid / acetic anhydride (18ml / 18ml), and 4wt% sulfuric acid, mix them thoroughly and add them to a three-necked flask. The temperature was raised to 60°C, and the reaction was carried out for 4 hours. After the reaction was completed, it was cooled to room temperature. Pour the reacted mixture into a centrifuge tube, centrifuge in a centrifuge, separate the supernatant from the precipitate, discard the su...
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[0024] Example 2
[0025] Pretreatment steps: dry the discarded pine branches, shear and grind them to a size of 120 mesh, take 10g of biomass powder and 100mL of 3% phosphoric acid solution, mix and stir to prepare a slurry, and pour it into a 250mL airtight autoclave. While stirring, the temperature was raised to 100° C., kept for 150 min, tap water was passed to cool to room temperature, and the reaction mixture was poured out. The reaction mixture was suction filtered, and the solid phase was collected and dried. Weigh 1g of the solid phase pretreated with phosphoric acid, acetic acid / acetic anhydride (10ml / 10ml), and 0.5wt% sulfuric acid, and add them to a three-necked flask. Raise the temperature to 10°C, react for 1 hour, and cool to room temperature after the reaction is complete. Pour the reacted mixture into a centrifuge tube, centrifuge in a centrifuge, separate the supernatant from the precipitate, discard the supernatant, and the resulting precipitate is the solid ...
Example Embodiment
[0027] Example 3
[0028] Pretreatment steps: dry greening waste willow leaves, shear and grind them to 80 mesh size, take 15g of biomass powder and 60mL of 8% acetic acid solution, mix and stir to prepare a slurry, and pour it into a 250mL airtight autoclave , While stirring, the temperature was raised to 150°C, kept for 300 minutes, and cooled to room temperature by running tap water, and the reaction mixture was poured out. The reaction mixture was suction filtered, and the solid phase was collected and dried. Weigh 5g of the solid phase pretreated with acetic acid, acetic acid / acetic anhydride (30ml / 30ml), and 6wt% sulfuric acid after fully mixing and adding them into a three-necked flask. The temperature was raised to 90°C, and the reaction was conducted for 8 hours. After the reaction was completed, it was cooled to room temperature. Pour the reacted mixture into a centrifuge tube, centrifuge in a centrifuge, separate the supernatant from the precipitate, discard the supe...
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