Preparation method of modified sodium alginate polymeric flocculant
A polymer flocculant, sodium alginate technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of complicated preparation process and low flocculation efficiency, and achieve the effect of abundant sources, enhanced flocculation performance, and simple preparation method
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Embodiment 1
[0032] Step 1, esterification modification process;
[0033] In a three-necked flask, add 30 mL of ethanol solvent, dissolve 1 mL of dimethyl sulfate in it, then add 200 g of sodium alginate powder, and react at 50 °C for 2 hours to obtain an esterified product;
[0034] Step 2, oximation modification process;
[0035] Prepare 10% hydroxylamine hydrochloride-methanol solution, then neutralize to pH=7 with 10% sodium hydroxide-methanol solution, filter, add 20 mL of the filtrate dropwise to the three-necked flask containing the esterification product in step 1, and then Use an appropriate amount of NaOH solution to adjust the pH value of the reaction system to 7, and stir the reaction at a reaction temperature of 25°C for 2 hours;
[0036] Step 3, suction filtration drying process;
[0037] After the reaction in step 2 is terminated, filter with suction, wash with methanol-water mixture, place the obtained filter cake in a vacuum drying oven, and dry at 50°C for 12 hours to o...
Embodiment 2
[0040] Step 1, esterification modification process;
[0041] In a three-necked flask, add 30 mL of ethanol solvent, dissolve 2 mL of dimethyl sulfate in it, then add 300 g of sodium alginate powder, and react at 60°C for 3 hours to obtain an esterified product;
[0042] Step 2, oximation modification process;
[0043] Prepare 10% hydroxylamine hydrochloride-methanol solution, then neutralize to pH=7 with 10% sodium hydroxide-methanol solution, filter, add 30 mL of the filtrate dropwise to the three-necked flask containing the esterification product in step 1, and then Adjust the pH value of the reaction system to 7 with an appropriate amount of NaOH solution, and stir the reaction for 4 hours at a reaction temperature of 35°C;
[0044] Step 3, suction filtration drying process;
[0045] After the reaction in step 2 is terminated, filter with suction, wash with methanol-water mixture, place the obtained filter cake in a vacuum drying oven, and dry at 50°C for 12 hours to obta...
Embodiment 3
[0048] Step 1, esterification modification process;
[0049] In a three-neck flask, add 60 mL of ethanol solvent, dissolve 3 mL of dimethyl sulfate in it, then add 250 g of sodium alginate powder, and react at 70°C for 3 hours to obtain an esterified product;
[0050] Step 2, oximation modification process;
[0051] Prepare 10% hydroxylamine hydrochloride-methanol solution, then neutralize to pH=7 with 10% sodium hydroxide-methanol solution, filter, add 40 mL of the filtrate dropwise to the three-necked flask containing the esterified product in step 1, and then Use an appropriate amount of NaOH solution to adjust the pH value of the reaction system to 7, and stir the reaction for 3 hours at a reaction temperature of 35°C;
[0052] Step 3, suction filtration drying process;
[0053] After the reaction in step 2 is terminated, filter with suction, wash with methanol-water mixture, place the obtained filter cake in a vacuum drying oven, and dry at 50°C for 12 hours to obtain w...
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