Polymeric ferric sulfate-poly-dimethyl-diallyl-ammonium chloride composite flocculent, preparation and use method thereof

A technology of polydimethyldiallylammonium chloride and polyferric sulfate, which is applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of inconvenient industrial production, use or complex preparation process, and achieve The method of use is convenient and concise, the effect of ensuring safety and reliability, and the content range is clear

Inactive Publication Date: 2008-12-17
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0013] (2) All organic macromolecules used are prepared by laboratory methods, such as documents 1 and 2, especially the monomers obtained by the two-step process are used as raw materials to prepare PDMDAAC, and the PDMDAAC products are also tested with organic solvents such as acetone. Cleaning and removal of small molecule products, the characteristic viscosity of which reaches a maximum of 1.9dL / g, as document 2, the organic polymers used in the preparation of complexes are not convenient for industrial production
As in Document 2, the use or complex preparation process is more complicated
[0015] (4) The application of existing composite coagulants only involves simulated water, domestic wastewater and farm water
[0016] It can be seen that the above-mentioned various defects have caused the common use of existing polyferric sulfate and polydimethyldiallyl ammonium chloride or the compound used after compounding can not become a class with clear composition structure and production process. It is simple, easy to use, superior in application performance, wide in adaptability, safe and reliable, and can be used in various raw water, especially in combination with micro-polluted, high-temperature and high-turbidity or low-temperature and low-turbidity raw water and various waste and sewage treatment and sludge dehydration processes. coagulant

Method used

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  • Polymeric ferric sulfate-poly-dimethyl-diallyl-ammonium chloride composite flocculent, preparation and use method thereof
  • Polymeric ferric sulfate-poly-dimethyl-diallyl-ammonium chloride composite flocculent, preparation and use method thereof
  • Polymeric ferric sulfate-poly-dimethyl-diallyl-ammonium chloride composite flocculent, preparation and use method thereof

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preparation example Construction

[0035]In conjunction with the accompanying drawings, the polyferric sulfate-polydimethyldiallylammonium chloride composite coagulant of the present invention is prepared by the following method, comprising the following steps:

[0036] (1) The dry powder or solution of polyferric sulfate (PFS) is placed in the mixing tank, and water is added to prepare the PFS solution whose iron salt content is greater than or equal to 11.0% in terms of the mass fraction of total iron;

[0037] (2) Stir the solution at room temperature, add a certain amount of polydimethyldiallylammonium chloride (PDMDAAC) with a mass fraction of 40% to 75% and a characteristic viscosity range of 0.5 to 4.5dL / g colloid, so that the mass ratio of the PFS amount in the mixed solution to the PDMDAAC in terms of total iron is 20.0:1~2.0:1.

[0038] (3) Stir the mixed solution at room temperature until the PDMDAAC colloid is completely dissolved to obtain a stable polyferric sulfate (PFS)-polydimethyldiallylammoni...

Embodiment 1

[0043] Embodiment 1: in conjunction with accompanying drawing, polyferric sulfate (PFS)-polydimethyldiallylammonium chloride (PDMDAAC) composite coagulant of the present invention and its preparation and application method are:

[0044] In the first step, the polyferric sulfate (PFS) whose quality index meets the requirements of the national standard (GB14591-2006) is placed in the mixing reactor, and its structural formula is Wherein: m>1. Add water to make it into a solution with a PFS content of 11.0% to 12.5% ​​in terms of iron mass fraction;

[0045] In the second step, stir the PFS solution at room temperature at 5-25°C, and add (65±5)% mass fraction to the solution, with a characteristic viscosity range of 0.5-4.5dL / g (30.0±0.1°C, 1mol / The polydimethyldiallyl ammonium chloride (PDMDAAC) colloid solution that measures in 1L NaCl solution, make PFS content in the solution be 20.0: 1~2.0: 1 with the mass ratio of total iron meter and PDMDAAC;

[0046] The third step is...

Embodiment 2

[0058] Embodiment 2: in conjunction with accompanying drawing, polyferric sulfate (PFS)-polydimethyldiallylammonium chloride (PDMDAAC) composite coagulant of the present invention and its preparation and application method are:

[0059] In the first step, the polyferric sulfate (PFS) whose quality index meets the requirements of the national standard (GB14591-2006) is placed in the mixing reactor, and its structural formula is Wherein: m>1. Water is added to make it into a solution with a PFS content of (12.5-15.0)% based on the mass fraction of total iron.

[0060] In the second step, stir the PFS solution at room temperature at -5 to 15°C, and add (45±5)% mass fraction to the solution, with a characteristic viscosity range of 0.5 to 4.5dL / g (30.0±0.1°C, 1mol / LNaCl solution) polydimethyldiallyl ammonium chloride (PDMDAAC) colloidal solution, the PFS content in the solution is 20.0: 1~2.0: 1 with the mass ratio of total iron meter and PDMDAAC;

[0061] The third step is to ...

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Abstract

The invention discloses a PFS-PDMDAAC compound coagulant, a corresponding preparation method and an application method. The PFS-PDMDAAC compound coagulant is prepared as the following steps: the PFS dry powder or solution is arranged in a mixing reactor, and water is added to obtain a ferric-salt PFS 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 PFS-PDMDAAC. The application of the PFS-PDMDAAC compound coagulant is to adopt the PFS-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 PFS-PDMDAAC compound coagulant, and the materials on industrial manufacturing are available. The various functions of the PFS-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 belongs to the preparation method of the compound of water-soluble inorganic polymer and organic cationic polymer, in particular to a polymeric ferric sulfate-polydimethyldiallylammonium chloride composite coagulant and its preparation and application method. Background technique [0002] Polyferric Sulfate (Poly Ferric Sulfate, PFS) is a widely used inorganic polymer water treatment agent, and its structural representation is as follows: [0003] (Formula 1) [0004] where m>1. [0005] As a water treatment agent, the advantage of polyferric sulfate is not only that it has a larger relative molecular mass and more effective bridging adsorption capacity than traditional small molecule iron salts, such as ferric sulfate and ferric chloride, but also has flocculation properties than polyaluminum salts. The time is short, the flocs are dense, the sedimentation speed is fast, the price is cheap and non-toxic, and the price is lower ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52
Inventor 张跃军李潇潇赵晓蕾
Owner NANJING UNIV OF SCI & TECH
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