Cellulose-based cationic flocculant, preparation method thereof and sludge precipitation method
A cellulose and flocculant technology, which is applied in flocculation/sedimentation water/sewage treatment, sludge treatment, chemical instruments and methods, etc., can solve the problems of poor flocculation effect of cellulose-based flocculation materials, etc. and flocculation, reducing effluent impurities, and accelerating the effect of sludge settling.
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[0029] figure 1 For the process flow diagram of the preparation method of the cellulose-based cationic flocculant provided in the examples of this application, please refer to figure 1 , the preparation method comprises the steps:
[0030] S110, prepare cyanoethyl cellulose: disperse the swollen cellulose in acrylonitrile and react to obtain cyanoethyl cellulose; wherein, the degree of substitution of the cyanoethyl group is 1.5-2.5. Illustratively, the degree of substitution of the cyanoethyl group is 1.5, 1.7, 2.0, 2.3 or 2.5.
[0031] S111, preparing swollen cellulose: immersing cellulose with a degree of polymerization not higher than 1000 in a mixed aqueous solution of sodium hydroxide and potassium thiocyanate and swelling for at least 20min to obtain swollen cellulose; wherein, the concentration of sodium hydroxide is 3- 10mol / L, the concentration of potassium thiocyanate is 0.5-2 mol / L.
[0032] As an example, the degree of polymerization of cellulose is 500, 600, 7...
Embodiment 1
[0055] A preparation method of a preparation method of a cellulose-based cationic flocculant, comprising
[0056] (1) At room temperature, immerse 2g of microcrystalline cellulose (DP=100~200) into an appropriate amount of mixed aqueous solution of sodium hydroxide (6mol / L) and potassium thiocyanate (1mol / L) to swell for 30min, then Squeeze to remove the alkaline solution, resulting in swollen cellulose. Continue to disperse the swollen cellulose in acrylonitrile, heat to 35° C., and stir for 70 min. After neutralization with 1 mol / L acetic acid, washed with distilled water and ethanol until no trace of iron ion was detected in the filtrate. The final solid product was dried under vacuum at 60°C to obtain cyanoethyl cellulose. The degree of cyanoethyl substitution is 1.5.
[0057] (2) Dissolve cyanoethyl fiber in dimethyl sulfoxide solvent, add a large amount of hydroxylamine hydrochloride / sodium hydroxide (molar ratio 1:1) solution, stir, and place in a 50°C oil bath for 1...
Embodiment 2
[0060] A preparation method of a preparation method of a cellulose-based cationic flocculant, comprising
[0061] (1) At room temperature, immerse 2g of microcrystalline cellulose (DP=100~200) into an appropriate amount of mixed aqueous solution of sodium hydroxide (6mol / L) and potassium thiocyanate (1mol / L) to swell for 30min, then Squeeze to remove the alkaline solution, resulting in swollen cellulose. Continue to disperse the swollen cellulose in acrylonitrile, heat to 35° C., and stir for 180 min. After neutralization with 1 mol / L acetic acid, washed with distilled water and ethanol until no trace of iron ion was detected in the filtrate. The final solid product was dried under vacuum at 60°C to obtain cyanoethyl cellulose. The degree of cyanoethyl substitution is 2.5.
[0062] (2) Dissolve cyanoethyl fiber in dimethyl sulfoxide solvent, add a large amount of hydroxylamine hydrochloride / sodium hydroxide (molar ratio 1:1) solution, stir, and place in a 50°C oil bath for ...
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