Homogeneous preparation method of cationic flocculant from bacterial cellulose
A cationic flocculant and bacterial cellulose technology, applied in the field of wastewater treatment, can solve the problems of refractory degradation, high price, environmental impact of waste, etc., and achieve the effects of improving reactivity, improving accessibility, and being easy to recycle and reuse.
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Embodiment 1
[0019] Embodiment 1: Dissolve 1g bacterial cellulose in 60 g of mass concentration 5% ethylenediamine solution, treat at room temperature for 30 min, then wash, filter, and dry to obtain activated bacterial cellulose; add the obtained activated bacterial cellulose to Put it into a mixed solution composed of 8 g dimethylacetamide and 2 g lithium chloride, react at 95°C for 24 hours, then cool, wash with water, and dry to obtain regenerated bacterial cellulose; add the regenerated bacterial cellulose to -5°C for pre-cooling 7wt% sodium hydroxide and 12wt% urea mixed solution (100 g), stir evenly, freeze at -20°C for 1 h, take it out, and stir at room temperature at high speed to obtain a uniform and transparent bacterial cellulose solution; the bacterial cellulose Under the action of mechanical stirring, the solution was fed with nitrogen gas for 30 minutes, then 6 g of 3-chloro-2 hydroxypropyltrimethylammonium chloride was added at 25 °C for etherification reaction, and the reac...
Embodiment 2
[0020] Embodiment 2: 20 g bacterial cellulose is dissolved in 100 g mass concentration 15% propylene diamine solution, room temperature process 120 min, then wash with, filter, dry, obtain activated bacterial cellulose; The activated bacterial cellulose obtained Add it to a mixed solution composed of 475 g dimethylacetamide and 5 g lithium chloride, react at 120°C for 2 h, then cool, wash with water, and dry to obtain regenerated bacterial cellulose; add the regenerated bacterial cellulose to 5°C for pre- Stir evenly in a cold 7wt% sodium hydroxide and 12wt% urea mixed solution (400 g), freeze at -20°C for 24 h, take it out, and stir at room temperature at high speed to obtain a uniform and transparent bacterial cellulose solution; the bacterial cellulose Under the action of mechanical stirring, nitrogen gas was introduced into the solution for 30 minutes, and then 120 g of glycidyltrimethylammonium chloride was added at 70°C for etherification reaction. After 24 hours of react...
Embodiment 3
[0021] Embodiment 3: Dissolve 10 g bacterial cellulose in 100 g mass concentration 10% dimethylamine solution, treat at room temperature for 60 min, then wash, filter, and dry to obtain activated bacterial cellulose; the activated bacterial cellulose obtained Add it to a mixed solution composed of 225 g dimethylacetamide and 25 g lithium chloride, react at 110°C for 12 h, then cool, wash with water, and dry to obtain regenerated bacterial cellulose; then add the regenerated bacterial cellulose to 0°C In the pre-cooled 7wt% sodium hydroxide and 12wt% urea mixed solution (200 g), stir evenly, freeze at -20°C for 12 h, take it out, place it at room temperature and stir at high speed to obtain a uniform and transparent bacterial cellulose solution; Under the action of mechanical stirring, the cellulose solution was fed with nitrogen gas for 30 minutes, and then 115 g of dimethyldiallyl ammonium chloride was added at 60°C for etherification reaction. After 12 hours of reaction, a un...
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