Preparation method of high-polymer flocculatant EA-g-SA (ethyl acrylate-g-succinic anhydride) esterificaiton-oxidation cassava starch
A polymer flocculant and cassava starch technology, applied in chemical instruments and methods, descaling and water softening, water/sludge/sewage treatment, etc., can solve problems such as unsatisfactory flocculation effect, achieve excellent flocculation effect, process Safe, easy-to-operate results
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[0052] Examples:
[0053] (1) Weigh 9.0 g of tapioca starch and place it in a vacuum drying oven at 60° C. and dry it for 24 hours to constant weight to obtain a dry base tapioca starch.
[0054] (2) Weigh 6 g of dry-based tapioca starch obtained in step (1) into a 250 mL four-necked flask, add 120 mL of distilled water as a reaction solvent, and stir at room temperature for 15 minutes until uniform to obtain a tapioca starch suspension.
[0055] (3) Raise the temperature of the system in step (2) to 55°C, add 0.1 g of ferrous sulfate heptahydrate to the system; stir for 10 minutes and then add 1.8 mL of 30% hydrogen peroxide solution, react for 2 hours, and cool To room temperature, the crude oxidized starch product is obtained.
[0056] (4) Centrifuge the crude product obtained in step (3) at a centrifugal speed of 2500 r / min for 15 minutes; then filter through a Buchner funnel, and wash the filter cake 3 times with 25 mL of 95% ethanol, and then place it Drying in a vacuum drying ...
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