A lignin-based flocculant
A lignin-based flocculant technology, applied in flocculation/sedimentation water/sewage treatment, natural water treatment, water treatment parameter control, etc., can solve problems such as low molecular weight, environmental hazards, molecular structure difficult to design or control, etc., to achieve The effect of rich sources, low prices, large market space and price advantages
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Embodiment 1
[0035] Preparation of flocculant A:
[0036] (1) Activation of lignin: Dissolve 1 g of lignin with deionized water, add 0.03 g of Fe(OH) 3 Catalyst and 1.2g concentration of 30% H 2 O 2 solution, the reaction temperature was controlled at 60 ° C, and the reaction was stirred for 60 min. When the reaction is over, the reaction solution is cooled and centrifuged to remove the catalyst, and excess absolute ethanol is added to precipitate the modified lignin. After centrifugation again, the effluent was washed 4 times with absolute ethanol, and the product was dried at 60-70 °C to obtain hydroxylated lignin-2.
[0037] (2) Preparation of phosphorylated lignin: Weigh 1 g of hydroxylated lignin-2 and dissolve it in deionized water, add 1.5 g of phosphorous acid to a three-necked flask, and shake well. It was placed in a constant temperature water bath equipped with a reflux condensing device and a magnetic stirring device, the water temperature was adjusted to 95°C to 98°C, and ...
Embodiment 2
[0047] Preparation of flocculant B:
[0048] (1) Activation of lignin: the activated lignin is prepared in the same step (1) as in Example 1;
[0049] (2) Preparation of Phosphorylated Lignin: Phosphorylated lignin was prepared in the same step (2) as in Example 1;
[0050] (3) Synthesis of quaternary ammonium salt intermediate: prepare quaternary ammonium salt intermediate with step (3) in Example 1;
[0051] (4) Preparation of Lignin Phosphate Quaternary Ammonium Salt: The same step (4) of Example 1 was used to obtain the quaternary ammonium phosphate lignin salt;
[0052] (5) Preparation of Pluronic cross-linked lignin phosphate quaternary ammonium salt: Weigh 17.5 g of Pluronic F-68 and dissolve it with 25 g of a mixed solvent of DMF and THF in an equal volume ratio, and place it in a reflux condensing device and a magnetic stirring device. In the constant temperature oil bath pot, adjust the temperature to 15 ℃, and pass argon gas. When the temperature is stable, add 0...
Embodiment 3
[0054] Preparation of flocculant C:
[0055] (1) Activation of lignin: The activated lignin was prepared in the same step (1) as in Example 1
[0056] (2) Preparation of Phosphorylated Lignin: Phosphorylated lignin was prepared in the same step (2) as in Example 1
[0057] (3) Synthesis of quaternary ammonium salt intermediate: same as Example 1 step (3) to obtain quaternary ammonium salt intermediate
[0058] (4) Preparation of Lignin Phosphate Quaternary Ammonium Salt: The same step (4) of Example 1 was used to obtain the quaternary ammonium phosphate lignin salt
[0059] (5) Preparation of Pluronic cross-linked lignin phosphate quaternary ammonium salt: Weigh 17.5 g of Pluronic F-68 and dissolve it with 50 g of a mixed solvent of DMF and THF in an equal volume ratio, and place it in a reflux condensing device and a magnetic stirring device. In the constant temperature oil bath pot, adjust the temperature to 15 ℃, and pass argon gas. When the temperature is stable, add 0....
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