Preparation method for high molecular weight cationic polyacrylamide

A polyacrylamide and high molecular weight technology, which is applied in the field of water-soluble polymer synthesis, can solve the problems of restricted production capacity, low molecular weight, poor solubility, etc., and achieve the effect of smooth and slow process, narrow molecular weight distribution and low production cost

Active Publication Date: 2012-09-26
ANHUI JUCHENG FINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The feature of this process is that cationic flocculants with different ionicity can be produced by adjusting the ratio of cationic monomer and acrylamide, but generally the redox initiation system reacts faster. Polyacrylamide itself is prone to cross-linking, resulting in poor solubility of the product and unsatisfactory application effect. The cationic polyacrylamide produced by this process generally has a molecular weight of 6 million to 8 million, with poor solubility and low molecular weight.
In the water treatment industry, poor solubility and low molecular weight will reduce the flocculation effect. In practical applications, increasing the dosage of chemicals to enhance the flocculation and sedimentation effect will increase the cost of water treatment
On the other hand, in order to ensure the solubility, the quality of the initiating polymerization solution should not be too much, generally 2, which restricts the improvement of production capacity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) at 7m 3 In the batching tank, prepare 4m 3 A homogeneous solution containing 280kg acrylamide, 1100kg acryloyloxyethyltrimethylammonium chloride (concentration 80%), less than 4m 3 Make up the part with deionized water, mix the three evenly, then add 32g of pentasodium ethylenediamine tetramethylene phosphonate (complexing agent), 600g of silicone oil (defoamer), and fully mechanically stir until the solution is clear , adjusted to pH=3.9 with 60kg oxalic acid to obtain a homopolymer solution without solid insolubles;

[0018] (2) After cooling the homopolymerization solution to 0.5-1°C, pump it into the polymerization kettle, add 1200g of azobisisobutyronitrile, and feed high-purity nitrogen (purity 99.9%, flow rate 80 m 3 / h) for 30 minutes, sequentially add the following solutions with a concentration of 5%: potassium thiosulfate solution, potassium thiosulfate content 48g, azodicarbonamide solution, azodicarbonamide content 80g, sodium sulfite solution, sodium...

Embodiment 2

[0021] (1) at 7m 3 In the batching tank, prepare 4m 3 A homogeneous solution containing 400kg of acrylamide, 950kg of acryloyloxyethyltrimethylammonium chloride (concentration of 80%), less than 4m 3 Make up the part with deionized water, mix the three evenly, then add 32g sodium gluconate (complexing agent), 600g silicone oil (defoamer), fully mechanically stir until the solution is clear, and obtain a homopolymer solution without solid insolubles , Adjust to pH=4.8 with 55kg acetic acid.

[0022] (2) After circulating the homopolymer solution to cool down to 1-1.5°C, pump it into 4m 3 In the polymerization kettle, add 1200g of azobisisobutyronitrile, and feed high-purity nitrogen for 30 minutes, and then add the following solutions with a concentration of 5% in turn: potassium thiosulfate solution, potassium thiosulfate content 48g, azo Formamide solution, the content of azodicarbonamide is 80g, sodium sulfite solution, the content of sodium sulfite is 240g, ferrous sulfa...

Embodiment 3

[0025] (1) at 7m 3 In the batching tank, prepare 4m 3 A homogeneous solution containing 400kg of acrylamide, 950kg of acryloyloxyethyltrimethylammonium chloride (concentration of 80%), less than 4m 3 Make up the part with deionized water, mix the three evenly, then add 32g of complexing agent sodium alginate and 600g of antifoaming agent silicone oil, fully mechanically stir until the solution is clear, and obtain a homopolymer solution without solid insolubles, use 48kg of phosphoric acid was adjusted to pH=5.3.

[0026] (2) After cooling the homopolymer solution to 1-2°C, pump it into 4m 3 In the polymerization kettle, add 1200g of azobisisobutyronitrile, and feed high-purity nitrogen for 30 minutes, and then add the following solutions with a concentration of 5% in turn: potassium thiosulfate solution, potassium thiosulfate content 48g, azo Formamide solution, the content of azodicarbonamide is 80g, sodium sulfite solution, the content of sodium sulfite is 240g, ferrous ...

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Abstract

A preparation method for high molecular weight cationic polyacrylamide includes following steps: uniformly mixing acrylamide, acryloyloxyethyl trimethylammonium chloride and deionized water to obtain homogeneous solution, then sequentially adding complexant and defoamer, stirring well until the solution is clear and adjusting the pH value with weak acids to obtain homopolymerized solution; pumping the homopolymerized solution into a polymerizer after cooling, adding azodiisobutyronitrile, feeding high-purity nitrogen, sequentially adding solutions respectively prepared by oxidant, azo-oxidant, reductant and auxiliary reductant, continuing to feed high-purity nitrogen and stopping after all the solutions are added, and controlling the temperature for polymerization reaction and aging reaction for hours to obtain transparent elastic rubber brick; and taking out the rubber brick, cutting, pelleting, drying, smashing and screening to obtain white powdery cationic polyacrylamide. The high molecular weight cationic polyacrylamide prepared by the method can be widely applicable to fields of organic wastewater treatment, papermaking auxiliaries and dispersant, oil field auxiliaries and the like.

Description

technical field [0001] The invention relates to a preparation method of high molecular weight cationic polyacrylamide, which belongs to the field of water-soluble polymer synthesis. Background technique [0002] Cationic polymer flocculant P (DAC-AM) is a copolymer of cationic monomer acryloyloxyethyltrimethylammonium chloride (DAC) and acrylamide (AM). It is a linear polymer with cationic charge, which has the characteristics of high charge density and good water solubility. At present, the preparation method of cationic polyacrylamide is generally a redox reaction system initiated polymerization process. This process combines cationic monomers with propylene Amides are mixed in proportion and then added to a redox system to initiate polymerization, thereby producing cationic polyacrylamide. The feature of this process is that cationic flocculants with different ionicity can be produced by adjusting the ratio of cationic monomer and acrylamide, but generally the redox init...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/34
Inventor 方晖陆海徐强段百军王青伟梁丰登
Owner ANHUI JUCHENG FINE CHEM
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