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Polyaluminum sulfate-branched poly(dimethyl diallyl ammonium chloride) composite coagulant and preparation method and application method thereof

A technology of dimethyl diallyl ammonium chloride and polyaluminum sulfate, which is applied in the direction of flocculation/precipitation water/sewage treatment, dehydration/drying/thickened sludge treatment, etc., to achieve uniform system, clear content range, water solubility Good results

Inactive Publication Date: 2011-07-06
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the mixing of various inorganic aluminum salt coagulants and organic polymers or the preparation and use of composite coagulants so far have not involved PAS, which is especially suitable for low-temperature, low-turbidity and micro-polluted river networks and lake water treatment. Study on Preparation of Composite Coagulant by Modification of Organic Macromolecule

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  • Polyaluminum sulfate-branched poly(dimethyl diallyl ammonium chloride) composite coagulant and preparation method and application method thereof
  • Polyaluminum sulfate-branched poly(dimethyl diallyl ammonium chloride) composite coagulant and preparation method and application method thereof
  • Polyaluminum sulfate-branched poly(dimethyl diallyl ammonium chloride) composite coagulant and preparation method and application method thereof

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preparation example Construction

[0039] In conjunction with the accompanying drawings, the polyaluminum sulfate-branched polydimethyldiallylammonium chloride composite coagulant of the present invention is prepared by the following method, that is, (1) will meet the national chemical industry standard (HG2227-2004 ) The required aluminum sulfate AS dry powder or solution is placed in the mixing tank, and water is added to prepare the AS content in Al 2 o 3 Calculate the AS solution whose mass fraction is greater than 6.0%, stir the AS solution, continuously drop alkali or alkaline earth metal compound or active aluminum hydroxide to carry out polymerization reaction, and control the pH value. When the pH value is greater than 3.5, stop feeding, filter and remove insoluble matter after reacting for 30 minutes, and obtain a transparent PAS solution with a certain degree of basicity;

[0040] (2) Put the prepared PAS solution in a mixing reactor, and add a branched chain with a solid content of 20% to 75% by ma...

Embodiment 1

[0057] Embodiment 1: in conjunction with accompanying drawing, polyaluminum sulfate-branched polydimethyldiallylammonium chloride composite coagulant of the present invention and its preparation and application method are:

[0058] In the first step, the aluminum sulfate AS dry powder or solution whose quality meets the requirements of the national chemical industry standard (HG2227-2004) is placed in the mixing reactor, and water is added to prepare the AS content in the range of Al 2 o 3 Calculate the AS solution whose mass fraction is greater than 6.0%, stir the AS solution, continuously drop alkali or alkaline earth metal compound or active aluminum hydroxide to carry out polymerization reaction, when the pH value is greater than 3.5, control the basicity to be (50 ± 5) %, stop feeding, and filter to remove insoluble matter after another 30 min of reaction to obtain a transparent PAS solution. The relative mass density of the PAS solution is greater than or equal to 1.15 ...

Embodiment 2

[0066] Embodiment 2: in conjunction with accompanying drawing, polyaluminum sulfate-branched polydimethyldiallylammonium chloride composite coagulant of the present invention and its preparation and application method are:

[0067] In the first step, the aluminum sulfate AS dry powder or solution whose quality meets the requirements of the national chemical industry standard (HG2227-2004) is placed in the mixing reactor, and water is added to prepare the AS content in the range of Al 2 o 3 Calculate the AS solution whose mass fraction is greater than 6.0%, stir the AS solution, continuously drop alkali or alkaline earth metal compound or active aluminum hydroxide to carry out polymerization reaction, when the pH value is greater than 3.5, control the basicity to be (40 ± 5) %, stop feeding, and filter to remove insoluble matter after another 30 min of reaction to obtain a transparent PAS solution. The relative mass density of the PAS solution is greater than or equal to 1.15 ...

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Abstract

The invention discloses a polyaluminum sulfate-branched poly (dimethyl diallyl ammonium chloride) composite coagulant and a preparation method and an application method thereof. The preparation method comprises the following steps: the step 1: aluminum sulfate (AS) dry powders or liquids, which meet the requirements for national chemical industry standards, are loaded to a mixing reactor, water is added to make an aluminum sulfate (AS) solution, the aluminum sulfate (AS) solution is stirred while an alkali or an alkaline earth metal compound or an active aluminum hydroxide is added dropwise to allow a polymerization reaction, the pH value or the alkalization degree is controlled, the materials are not added when the pH value exceeds a preset value, the insoluble substances are filtered off after the reaction carries out for a certain time period, and a transparent polyaluminum sulfate (PAS) solution is prepared; the step 2: the polyaluminum sulfate (PAS) solution is loaded to another mixing reactor, and branched poly(dimethyl diallyl ammonium chloride) (PDMDAAC) colloids or dry powders are added at a room temperature or under a heating condition; and the step 3: the mixed liquid is stirred under room temperature until branched PDMDAAC colloids are thoroughly dissolved, so as to obtain the final product. The final product of polyaluminum sulfate-branched poly (dimethyl diallyl ammonium chloride) composite coagulant is applied to the flocculation treatment of waste water and sewage.

Description

technical field [0001] The invention relates to a compound preparation technology of an inorganic polymer and an organic cationic polymer, especially a polyaluminum sulfate-branched polydimethyldiallylammonium chloride composite coagulant and its preparation and application method. Background technique [0002] Polyaluminum sulfate (Poly Aluminum Sulfate, PAS) is a widely used inorganic polymer water treatment agent, and its structural representation is as follows: [0003] Al n (OH) m (SO 4 ) [(3n-m) / 2] (Formula 1) [0004] Among them, 0<m<3n. [0005] As a water treatment agent, the advantage of PAS is that it has a larger relative molecular mass than traditional low-molecular aluminum salts, such as aluminum sulfate and aluminum chloride, and more effective bridging and adsorption capacity, and it is cheaper than organic polymer coagulants. Low. Compared with polyaluminium chloride, it has the characteristics of fast h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/56C02F11/14
Inventor 张跃军李潇潇赵晓蕾
Owner NANJING UNIV OF SCI & TECH
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