Method for recycling cyanuric acid from cyanuric acid waste residue
A cyanuric acid and waste residue technology, applied in organic chemistry and other directions, can solve the problems of insufficient white color, low purity, and difficulty in direct reuse of cyanuric acid, achieving low production cost, high decolorization efficiency, high purity and high yield effect
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Embodiment 1
[0023] (1) Wooden activated carbon was washed with HCl solution with a molar concentration of 0.01 mol / L, and after suction filtration, it was washed with deionized water until neutral, and dried at 80°C.
[0024] (2) Place a 250mL three-neck flask with a thermometer in a water bath, add 50mL of Mn(NO 3 ) 2 solution and 10 g of pretreated wood activated carbon. Keep stirring in a water bath at 60°C. After 12 hours, filter, wash with 15 mL of deionized water, and then dry at 90°C for 5 hours.
[0025] (3) 9 g of the obtained woody activated carbon was put in a tubular reaction furnace and roasted at 400° C. in a nitrogen atmosphere, and kept at a constant temperature for 3 hours to obtain a decolorizing agent.
[0026] (4) Place a 500 mL three-neck flask with a thermometer in an oil bath, add 100 mL of deionized water and 50 g of cyanuric acid waste residue. After stirring in an oil bath at 105°C for 10 minutes, add 7.5 g of a decolorizing agent, stir for 15 minutes, filter...
Embodiment 2
[0029] (1) The coal-based activated carbon was washed with HCl solution with a molar concentration of 0.01 mol / L, and after suction filtration, it was washed with deionized water until neutral, and dried at 80°C.
[0030] (2) Put a 250mL three-neck flask with a thermometer in a water bath, add 50mL of NH with a molar concentration of 0.5mol / L 4 VO 3 solution and 10 g of pretreated coal-based activated carbon. Keep stirring in a water bath at 80°C. After 18 hours, filter, wash with 15 mL of deionized water, and then dry at 90°C for 5 hours.
[0031] (3) 9 g of the obtained coal-based activated carbon was put in a tubular reaction furnace and roasted at 550° C. in a nitrogen atmosphere, and kept at a constant temperature for 4 hours to obtain a decolorizing agent.
[0032] (4) Place a 500 mL three-necked flask with a thermometer in an oil bath, add 150 mL of deionized water and 50 g of cyanuric acid waste residue. After stirring in an oil bath at 120° C. for 20 minutes, add ...
Embodiment 3
[0035] (1) Wash the coconut shell activated carbon with HCl solution with a molar concentration of 0.01mol / L, wash it with deionized water until neutral after suction filtration, and dry it at 80°C.
[0036] (2) Place a 250mL three-neck flask with a thermometer in a water bath, add 50mL of ZrOCl with a molar concentration of 0.5mol / L 2 ·8H 2 O solution and 10 g of pretreated coconut shell activated carbon. Keep stirring in a 90°C water bath. After 24 hours, filter, wash with 15 mL of deionized water, and then dry at 90°C for 5 hours.
[0037] (3) 9 g of the obtained coconut shell activated carbon was put in a tubular reaction furnace and roasted at 700° C. in a nitrogen atmosphere, and after constant temperature for 6 hours, a decolorizing agent was obtained.
[0038] (4) Place a 500 mL three-neck flask with a thermometer in an oil bath, add 250 mL of deionized water and 50 g of cyanuric acid waste residue. After stirring in an oil bath at 155°C for 25 minutes, add 3 g of ...
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