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Method for preparing dewatered modified cation flocculating agent

A cationic flocculant, hydrophobic modification technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of small molecular weight of flocculant, long flocculation time, uneven molecular weight distribution, etc., to improve the relative molecular weight and enhance the adsorption capacity. , the effect of increasing the solubility

Inactive Publication Date: 2008-09-24
MAOMING POLYTECHNIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the preparation methods currently used for this type of flocculant initiate polymerization above 30°C, and a few initiate polymerization at 5-10°C. These temperatures cannot guarantee the rapid release of the polymerization heat generated by the polymerization reaction itself during polymerization, making the polymerization temperature biased. High, the polymerization reaction is rapid, the molecular weight of the obtained polymer flocculant is small, and the molecular weight distribution is uneven. Various literatures show that the flocculant product turns yellow, or even dark yellow, which is the appearance of high temperature during the polymerization process.
Due to the small molecular weight of the flocculant, when the flocculant is used, the flocculation time is long, the dosage is large (generally greater than 100mg / L), the turbidity removal rate and COD removal rate are not high, and the water purification treatment effect is not ideal.

Method used

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  • Method for preparing dewatered modified cation flocculating agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] a. Add 12g of acrylamide and 0.2g of cetyltrimethylammonium bromide to a 250mL flask equipped with a stirrer, a thermometer, a feeding dropping funnel, and a nitrogen inlet and outlet, stir and dissolve with a small amount of water, and put In the ice-water mixture, pass nitrogen to remove oxygen, then add 9.2 mL of acryloyloxyethyltrimethylammonium chloride, and adjust the pH to 4 with HCl;

[0033] b. Add 1.2 g of butyl acrylate, add 36 mL of water, and continue stirring with nitrogen for 25 min;

[0034] c. Add 2.5 mL each of 1% sodium bisulfite, potassium persulfate, and urea aqueous solution, and 1.2 mL of 1% azobisisobutyronitrile, respectively, and seal it after stirring rapidly under nitrogen;

[0035] d. Freeze at -18°C until the solution freezes completely;

[0036] e. After completely dissolving at 30±2°C, let it stand for 4 hours to obtain a colorless colloidal flocculant;

[0037] The temperature of steps a, b, c is controlled at 1°C.

[0038] The intrin...

Embodiment 2

[0040] a. Add 6g of acrylamide and 0.5g of cetyltrimethylammonium bromide to a 250mL flask equipped with a stirrer, a thermometer, a feeding dropping funnel, and a nitrogen inlet and outlet, add a small amount of water and stir to dissolve, and put In the ice-water mixture, pass nitrogen to remove oxygen, then add 60 mL of acryloyloxyethyltrimethylammonium chloride, stir well, and adjust to pH = 5 with HCl;

[0041] b. Add 0.6g of butyl acrylate, add 70mL of water, and continue stirring with nitrogen for 30min;

[0042] c. Add 5.5mL each of 1% sodium bisulfite, potassium persulfate, and urea aqueous solution, and 3.0mL of 1% azobisisobutyronitrile respectively, stir rapidly under nitrogen, and then seal;

[0043] d. Freeze at -17°C until the solution freezes completely;

[0044] e. After completely dissolving at a room temperature of 30±2°C, let stand for 3.5 hours to obtain a colorless colloidal flocculant.

[0045] The temperature of steps a, b, c is controlled at 2°C.

...

Embodiment 3

[0048] a. Add 6g of acrylamide and 0.5g of cetyltrimethylammonium bromide to a 250mL flask equipped with a stirrer, a thermometer, a feeding dropping funnel, and a nitrogen inlet and outlet, add a small amount of water and stir to dissolve, and put In the ice-water mixture, pass nitrogen to remove oxygen, then add 60 mL of acryloyloxyethyltrimethylammonium chloride, stir well, and adjust to pH = 5 with HCl;

[0049] b. Add 1.2 g of butyl acrylate, add 70 mL of water, and continue stirring with nitrogen for 25 min;

[0050] c. Add 5.8mL each of 1% sodium bisulfite, potassium persulfate, and urea aqueous solution, and 3.2mL of 1% azobisisobutyronitrile, stir rapidly under nitrogen, and then seal;

[0051]d. Freeze at -16°C until the solution freezes completely;

[0052] e. After completely dissolving at room temperature 30±2°C, let stand for 3 hours to obtain a colorless colloidal flocculant.

[0053] The temperature of steps a, b, c is controlled at 3°C.

[0054] The intrins...

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Abstract

The invention relates to a preparation method of a lyophobic modification cation flocculating agent, which includes the procedures that: a, acrylamide, acryloyl oxygen ethyl trimethyl lammonium chloride and cation surface active agent are dissolved by a little water, and nitrogen is led and oxygen is removed; b, butyl acrylate and quantitative water are added to prepare the solution with the total mass concentration being 20-40 percent, and the nitrogen is led and the oxygen is removed; c, evocating agent is added, and the solution is sealed; d, the solution is cooled under the condition of minus 18 to minus 12 DEG C till being completely frozen; e, under the condition of 30-35 DEG C, the frozen solution is fully dissolved, and then is set for 2-4 h for obtaining the flocculating agent, wherein, the mol ratio of the three monomers of the acrylamide, the acryloyl oxygen ethyl trimethyl lammonium chloride and the cation surface active agent is 4:1 to 3:0.2 to 0.2:0.3, the procedures a, b, and c are performed under the condition of mixing and the temperature being controlled between 0-3 DEG C. The lyophobic modification cation flocculating agent has the advantages of small unit volume consumption and good treatment effect.

Description

technical field [0001] The invention relates to a preparation method of an organic polymer compound, in particular to a preparation method of a hydrophobically modified cationic flocculant. Background technique [0002] The flocculation and sedimentation method is one of the important methods for treating all kinds of sewage at present. It removes the colloid, solid suspended matter and dissolved organic matter in the water through the bridging flocculation and sweeping action of the flocculant added to the polluted water body. To achieve the purpose of water purification. Sedimenty water, algae-containing sewage, oil refining, papermaking wastewater, etc., mostly contain colloids or suspended solids with anions on the surface, which are stable in nature and difficult to flocculate and settle. Cationic polyacrylamide flocculants are widely used in such sewage processing. Most of the preparation methods currently used for this type of flocculant initiate polymerization abov...

Claims

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Application Information

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IPC IPC(8): C02F1/52
Inventor 王春晓董利梁志
Owner MAOMING POLYTECHNIC
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