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Polyaluminium chloride e-poly-dimethyl-diallyl-ammonium chloride composite flocculent, preparation and use method thereof

A technology of polydimethyldiallyl ammonium chloride and polyaluminum chloride, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problem of unclear composition and content, unclear polymer structure, and unfavorable drinking water safety. and other problems, to achieve the effect of convenient and simple use, ensuring safety and reliability, and clear content range

Inactive Publication Date: 2008-12-17
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0017] (1) The composition and structure of the active ingredient of the main raw material inorganic aluminum salt is not clear, such as Document 1, Document 3, Document 6-8; or the composition of other important components in the main raw material such as various metal salts, especially heavy metal salts, harmful impurities And the content is not clear, such as literature 1~8
[0018] (2) The polymer structure of the main raw material organic cationic polymer is not clear, such as Document 3, Document 6-8, or the structure contains other non-dimethyl diallyl ammonium chloride structural units, especially acrylamide units, Used as a coagulant, it is not conducive to drinking water safety, such as literature 4, literature 6-8
Therefore, it limits its wide application and processing effectiveness when it is mixed with inorganic salts or used as a coagulant.
[0019] (3) Inorganic salt organic cationic polymer composite coagulant is mixed and added before and after use, including adding immediately after mixing, adding at the same time and putting in successively, etc. It is not clearly proposed to make a stable composite coagulation first or the preparation of composite coagulant, but the preparation method used is not clear, such as Document 1, or the preparation method of the compound is cumbersome, such as Document 4, Document 5
[0020] (4) There are certain restrictions on the target water body to be treated. For example, the method in Document 1 is suitable for the treatment of low turbidity raw water, the method in Document 2 is only suitable for the treatment of algae-containing water, and the method in Document 3 is suitable for the treatment of alkalinity less than 30mg / L, or raw water with a turbidity greater than 150NTU, the method in Document 4 is limited to the treatment of waste water
[0021] It can be seen that the above-mentioned various shortcomings have caused the existing mixtures or composite coagulants of various inorganic aluminum salts and organic cationic polymers to be unable to become a class with clear composition structure, simple production process, stable product storage properties, Easy to use, superior application performance, wide applicability, safe and reliable, can be used in various raw water, especially micro-polluted, high-temperature high-turbidity or low-temperature low-turbidity raw water treatment and sludge, composite coagulant for sludge dehydration process

Method used

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  • Polyaluminium chloride e-poly-dimethyl-diallyl-ammonium chloride composite flocculent, preparation and use method thereof
  • Polyaluminium chloride e-poly-dimethyl-diallyl-ammonium chloride composite flocculent, preparation and use method thereof
  • Polyaluminium chloride e-poly-dimethyl-diallyl-ammonium chloride composite flocculent, preparation and use method thereof

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preparation example Construction

[0040] In conjunction with the accompanying drawings, the polyaluminum chloride-polydimethyldiallylammonium chloride composite coagulant of the present invention is prepared by the following method, that is, (1) the polyaluminum chloride PAC dry powder or solution is placed in the mixing In the kettle, add water to adjust the content of aluminum salt PAC to Al 2 o 3 Calculate the PAC solution whose mass fraction is 10.5% to 20.5%;

[0041] (2) Stir the PAC solution at room temperature, add polydimethyldiallyl ammonium chloride PDMDAAC with a solid content of 40% to 75% by mass fraction and a characteristic viscosity value in the range of 0.5 to 4.7dL / g Colloid, so that Al in the mixed solution 2 o 3 The mass ratio with PDMDAAC is 20.0:1~2.0:1;

[0042] (3) Stir the mixed solution at normal temperature until the PDMDAAC colloid is completely dissolved to obtain a stable polyaluminum chloride-polydimethyldiallylammonium chloride composite coagulant.

[0043] In the above me...

Embodiment 1

[0047] Embodiment 1: in conjunction with accompanying drawing, polyaluminum chloride (PAC)-polydimethyldiallylammonium chloride (PDMDAAC) composite coagulant of the present invention and its preparation and application method are:

[0048] In the first step, polyaluminum chloride (PAC) whose quality index meets the international (GB15892-2003) requirements is placed in the mixing reactor, and its structural formula is Al n (OH) m Cl (3n-m) , where: 02 o 3 The mass fraction is 10.5% to 11.0% solution;

[0049] In the second step, the PAC solution is stirred at room temperature at 5-25°C, and the solid content is (65±5)% in terms of mass fraction, and the characteristic viscosity range is 0.5-4.7dL / g (30.0±0.1 ℃, measured in 1mol / L NaCl solution) polydimethyldiallylammonium chloride (PDMDAAC) colloid solution, so that the PAC content in the solution is expressed as Al 2 o 3 The mass ratio of meter to PDMDAAC is 20.0:1~2.0:1;

[0050] The third step is to stir and mix the a...

Embodiment 2

[0068] Embodiment 2: in conjunction with accompanying drawing, polymeric ammonium chloride (PAC)-polydimethyldiallylammonium chloride (PDMDAAC) composite coagulant of the present invention and its preparation and application method are:

[0069] In the first step, polyaluminum chloride (PAC) whose quality index meets the requirements of the national standard (GB15892-2003) is placed in the mixing reactor, and its structural formula is Al n (OH) m Cl (3n-m) , where: 02 o 3 The mass fraction is calculated as (19.5±1)% solution.

[0070] In the second step, the PAC solution is stirred at room temperature at -5 to 15°C, and the mass fraction of the solid content is (45±5)% added to the solution, and the characteristic viscosity value ranges from 0.5 to 4.7dL / g (30.0±5)%. 0.1 ℃, 1mol / LNaCl solution) polydimethyldiallyl ammonium chloride (PDMDAAC) colloid solution, so that the PAC content in the solution is expressed as Al 2 o 3 The mass ratio of meter to PDMDAAC is 20.0:1~2.0:...

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Abstract

The invention discloses a PAC-PDMDAAC compound coagulant, a corresponding preparation method and an application method. The PAC-PDMDAAC compound coagulant is prepared as the following steps: the PAC dry powder or solution is arranged in a mixing reactor, and water is added to obtain a PAC solution which is stirred under normal temperature and a PDMDAAC colloid is added into the solution; the mixed solution is stirred under normal temperature till the PDMDAAC colloid is completely dissolved to obtain a stable PAC-PDMDAAC. The application of the PAC-PDMDAAC compound coagulant is to adopt the PAC-PDMDAAC compound coagulant for the coagulation treatment to raw water and waste water and sewage and the dehydration treatment to sludge or silt directly or after dilution with water by any proportion. The component structure and content scope of the invention are distinct to guarantee the capability and stability of the obtained PAC-PDMDAAC compound coagulant, and the materials on industrial manufacturing are available. The various functions of the PAC-PDMDAAC compound coagulant can be adjusted during water treatment with high adaptability so as to reduce cost, reinforce coagulation effect and dramatically enhance the quality of obtained water.

Description

a technical field [0001] The invention relates to a composite preparation technology of a water-soluble inorganic polymer and an organic cationic polymer, in particular to a polyaluminum chloride-polydimethyldiallylammonium chloride composite coagulant and its preparation and application methods. Two background technology [0002] Polyaluminum chloride (Poly Aluminum Chloride, PAC) is a widely used inorganic polymer water treatment agent, and its structural representation is as follows: [0003] Al n (OH) m Cl (3n-m) (Formula 1) [0004] Among them, 0<m<3n. [0005] As a water treatment agent, the advantage of polyaluminum chloride is that it has a larger relative molecular mass than traditional low-molecular aluminum salts, such as aluminum sulfate and aluminum chloride, and has more effective bridging and adsorption capabilities, and is more effective than organic polymer coagulation. The price of the agent is low. However, due to the limitations of its mo...

Claims

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Application Information

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IPC IPC(8): C02F1/52
Inventor 张跃军赵晓蕾李潇潇
Owner NANJING UNIV OF SCI & TECH
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