Method for coproducing xylose, white carbon black and active carbon from rice hulls
A technology of white carbon black and activated carbon is applied in the field of co-production of xylose, white carbon black and activated carbon from rice husks, which can solve the problems of high energy consumption, difficult control, and many activated carbon equipment, and achieves high relative yield of carbon, The effect of easy industrial production and maximum use of raw materials
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Embodiment 1
[0029] (1) Wash 40 grams of rice husks and put them in a heating container, add water, stir, heat and boil for 50 minutes, cool and filter to get the filter residue, put the filter residue into a three-necked flask, add 3 times the water (volume ratio), and add 20ml under stirring The concentration is 80% sulfuric acid, heated to boiling, stirred and refluxed for 200 minutes, cooled and filtered. Put the filtrate into a 400ml beaker, heat to 75°C, add calcium hydroxide suspension with a specific gravity of 1.1 under constant stirring, stop adding calcium hydroxide suspension when the pH value of the solution reaches 2.8, and filter Remove calcium sulfate precipitate. Put the filtrate into a rotary evaporator, heat, evaporate and concentrate to 30% of its original volume, cool down to 70°C, add activated carbon to continuously stir and decolorize, filter to obtain a colorless and transparent solution, and use an ion exchange resin to remove organic acids at 25°C. Heating, evap...
Embodiment 2
[0033](1) Wash 40 grams of rice husks and put them in a heating container, add water, stir and boil for 90 minutes, cool and filter to obtain filter residues, put the filter residues into a three-necked flask, add 4 times the water (volume ratio), and add 20ml of concentration under stirring It is 80% sulfuric acid, heated to boiling, stirred and refluxed for 240 minutes, cooled and filtered. Put the filtrate into a 400ml beaker, heat to 85°C, add calcium hydroxide suspension with a specific gravity of 1.7 under constant stirring, stop adding calcium hydroxide suspension when the pH value of the solution reaches 3.0, and filter Remove calcium sulfate precipitate. Put the filtrate into a rotary evaporator, heat, evaporate and concentrate to 40% of its original volume, cool down to 80°C, add activated carbon to continuously stir and decolorize, filter to obtain a colorless and transparent solution, and use an ion exchange resin to remove organic acids at 30°C. Heating, evaporat...
Embodiment 3
[0037] (1) Wash 40 grams of rice husks and put them in a heating container, add water, stir and boil for 70 minutes, cool and filter to obtain a filter residue, put the filter residue in a three-necked flask, add 3.5 times of water, and add 20ml of 80% sulfuric acid under stirring , heated to boiling, stirred and refluxed for 220 minutes, cooled and filtered. Put the filtrate into a 400ml beaker, heat to 80°C, add calcium hydroxide suspension with a specific gravity of 1.4 under constant stirring, stop adding calcium hydroxide suspension when the pH value of the solution reaches 2.9, and filter Remove calcium sulfate precipitate. Put the filtrate into a rotary evaporator, heat, evaporate and concentrate to 35% of its original volume, cool down to 75°C, add activated carbon to continuously stir and decolorize, filter to obtain a colorless and transparent solution, and use an ion exchange resin to remove organic acids at 28°C. Heating, evaporating and crystallizing with a rotar...
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