Solid super acid and application thereof in preparing 4,4'-diaminodiphenylmethane
A technology of diaminodiphenylmethane and solid super acid, applied in the preparation of amino compounds, preparation of organic compounds, molecular sieve catalysts, etc., can solve the problem of small annual consumption of fly ash, human and biological hazards, and easy generation of dust problem, to achieve the effect of good reuse, no corrosion of equipment, and increased wear and tear of equipment
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Embodiment 1
[0025] Fly ash SO 4 2- The solid superacid is prepared from waste fly ash of coal-fired power plants, and its preparation method includes the following steps:
[0026] (1) Treatment of fly ash: Fly ash waste from coal-fired power plants is decarbonized by flotation, washed 3 times with deionized water, dried at 120°C for 5 hours, cooled, dispersed, passed through 200 sieves, and kept under the sieve thing;
[0027] (2) Treatment of undersize: Take 10g of undersize and put it into 40ml of hydrochloric acid and stir to fully dissolve the soluble matter that can dissolve in hydrochloric acid in the undersize, then heat to boiling and keep for 1 hour, cool, and use ammonia water Adjust the pH value to 9.7, then lower it to 10°C and keep it for 24 hours for low-temperature aging, filter, and wash the filter cake to be free of Cl - After detection, the filter cake was dried at 120°C for 12 hours and cooled to room temperature to obtain A;
[0028] (3) Put A into 50ml of sulfuric...
Embodiment 2
[0030] Fly ash SO 4 2- The solid superacid is prepared from waste fly ash of coal-fired power plants, and its preparation method includes the following steps:
[0031] (1) Treatment of fly ash: The fly ash of coal-fired power plant waste is decarbonized by flotation, washed 5 times with deionized water, dried at 120°C for 5 hours, cooled, dispersed, passed through 200 sieves, and kept under the sieve thing;
[0032] (2) Treatment of undersize: Take 10g of undersize and put it into 35ml of hydrochloric acid and stir to fully dissolve the soluble matter in the undersize that can dissolve in hydrochloric acid, then heat to boiling and keep for 4 hours, cool, and use ammonia water Adjust the pH value to 9.2, then lower it to 0°C and keep it for 3 hours for low-temperature aging, filter, and wash the filter cake to be free of Cl - After detection, the filter cake was dried at 120°C for 12 hours and cooled to room temperature to obtain A;
[0033] (3) Put A into 65ml of sulfuric...
Embodiment 3
[0035] Fly ash based zeolite SO 4 2- The solid superacid is prepared from waste fly ash of coal-fired power plants, and its preparation method includes the following steps:
[0036] (1) Treatment of fly ash: Fly ash waste from coal-fired power plants is decarbonized by flotation, washed 3 times with deionized water, dried at 120°C for 5 hours, cooled, dispersed, passed through 200 sieves, and kept under the sieve thing;
[0037] (2) Treatment of undersize: Put 10 g of undersize into 60 ml of 35% aqueous sodium hydroxide solution and stir to fully dissolve the soluble matter in the undersize that can be dissolved in aqueous sodium hydroxide solution. Then heated to boiling and kept for 2 hours, cooled to 5°C and kept for 18 hours for low-temperature aging, filtered, washed the filter cake until the pH value of the filtrate was 9.0, dried the filter cake at 120°C for 12 hours, cooled to room temperature, and obtained B ;
[0038] (3) Immerse B in 20ml of sulfuric acid soluti...
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