Preparation method for cellulose-based wastewater flocculating agent
A waste water flocculant, cellulose-based technology, applied in the field of pulp and papermaking engineering, can solve the problems of high production cost, non-natural degradation, source dependence, etc., and achieve the effect of reducing dependence on oil resources, important environment, and reducing production costs
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Embodiment 1
[0015] 1) Add softwood bleached pulp to a mixed solution of sodium hydroxide and urea pre-cooled at 4°C for 30 minutes, where the mass fractions of sodium hydroxide and urea are 7wt% and 12wt%, respectively. The mass ratio of bleached pulp is 80:1, stirred evenly, placed at -12°C for 90 minutes, taken out and placed in an ice bath for stirring to obtain a uniform and transparent cellulose solution;
[0016] 2) Put the cellulose solution obtained in step 1) under the action of mechanical stirring, pass nitrogen gas for 30 minutes, add ammonium persulfate at 70 ° C for 15 minutes, the mass ratio of ammonium persulfate to softwood bleached pulp is 0.4:1, add propylene Carry out graft polymerization of amide, the mass ratio of acrylamide and softwood bleached pulp is 4:1, add distilled water to control the mass ratio of whole reaction solution and softwood bleached pulp to be 90:1, react 150min, obtain uniform milky white solution, namely Cellulose-based wastewater flocculant (a)....
Embodiment 2
[0018] 1) Add the hardwood bleached pulp to the mixed solution of sodium hydroxide and urea pre-cooled at 4°C for 30 minutes, wherein the mass fractions of sodium hydroxide and urea are 7wt% and 12wt%, respectively. The mass ratio of bleached pulp is 70:1, stirred evenly, placed at -12°C for 120 minutes, taken out and placed in an ice bath for stirring to obtain a uniform and transparent cellulose solution;
[0019] 2) Put the cellulose solution obtained in step 1) under the action of mechanical stirring, pass nitrogen gas for 30 minutes, add ammonium persulfate at 60 ° C for 20 minutes, the mass ratio of ammonium persulfate to hardwood bleached pulp is 0.3:1, add propylene Carry out graft polymerization of amide, the mass ratio of acrylamide and hardwood bleached pulp is 3:1, add distilled water to control the mass ratio of whole reaction solution and hardwood bleached pulp to be 80:1, react 120min, obtain uniform milky white solution, namely Cellulose-based wastewater floccu...
Embodiment 3
[0021] 1) Add bleached bamboo pulp to a mixed solution of sodium hydroxide and urea pre-cooled at 4°C for 30 minutes, where the mass fractions of sodium hydroxide and urea are 7wt% and 12wt%, respectively. The mass ratio is 60:1, stirred evenly, placed at -12°C for 120 minutes, taken out and stirred in an ice bath to obtain a uniform and transparent cellulose solution;
[0022] 2) Put the cellulose solution obtained in step 1) under the action of mechanical stirring, pass nitrogen gas for 30 minutes, add ammonium persulfate at 50°C for 25 minutes, the mass ratio of ammonium persulfate to bamboo bleached pulp is 0.2:1, add acrylamide Carry out graft polymerization, the mass ratio of acrylamide and bamboo bleached pulp is 2:1, add distilled water to control the mass ratio of whole reaction solution and bamboo bleached pulp to be 70:1, react for 90min, obtain uniform milky white solution, namely cellulose base Wastewater flocculant (c).
[0023] The grafting ratios of the three ...
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