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Nonionic Polyacrylamide Reaction Principle
Sep 27, 2017

Non-ionic polyacrylamide is a water-soluble polymer or polyelectrolyte. Due to its molecular chain contains a certain number of polar groups, it can through the adsorption of solid particles suspended in water, make the bridge between particles or by charge neutralization condensed to form large floc particles. Therefore, it can accelerate the sedimentation of particles in suspended fluid, and it is very obvious to accelerate solution clarification and promote the effect of filtration. It is mainly used in flocculation and settling of various industrial wastewater. Such as waste water treatment of paper and pulp waste water, waste water treatment of mineral and metal smelting process, waste water treatment of steel plant and stone processing plant etc.

Nonionic polyacrylamide mainly depends on the physical properties of the behavior in aqueous solution, due to the molecular chain containing amide or ion gene, so its salient features are high hydrophilicity, can be all kinds of proportion of soluble in water, PAM aqueous solution of electrolyte has good tolerance, such as ammonium chloride, sodium sulfate and so on are not sensitive to the surfactant are incompatible.

Reaction principle

Nonionic polyacrylamide molecular chain on the side of the base for active amide group, it can produce various chemical reaction can have a variety of derivatives, but as a result of nearby genes effect, often can't completely reaction.

Because of nonionic polyacrylamide (NPAM) is a polymer or polymer electrolyte, its molecular chain contains a certain amount of polarity gene can adsorption of solid particles suspended in water, to make the bridge between particles to form the floc. It accelerates the settlement of particles in the suspended fluid, and has a very obvious acceleration of the clarification of the solution and the effect of filtration.

Application field

1, as flocculating agent, mainly used in industrial solid-liquid separation process, including settlement, clarification, concentration and sludge dewatering technology, application of the main industries are: urban sewage treatment, paper industry, food processing, petrochemical industry, metallurgical industry, processing industry, dyeing industry and sugar industry and all kinds of industrial wastewater treatment. Used in urban sewage and meat, poultry, food processing wastewater treatment process of sludge precipitation and sludge dewatering by its organic colloid electrical group of sludge negative charge neutralization and excellent polymer bridging coagulation function, prompting colloid particles gathered into large pieces of floc, separated from the slurry. The effect is obvious, the amount is less.

2. In the paper industry, it can be used as a paper drying agent, a retention agent and a filter, which can improve the quality of paper, save cost and improve the production capacity of the paper mill. Can be directly with inorganic salt ions, fiber, and other organic polymer electrostatic bridge so as to enhance the physical strength of paper, and reduce the loss of fiber or filler to accelerate the filtering, enhancement and retention, leaching effect, can also be used for water treatment, at the same time, in the deinking process can a obvious flocculation effect.

3. The fiber mud (asbestos - cement products) can improve the water quality of the forming asbestos - cement products and improve the strength of asbestos slab materials. In the insulation board, the combination of additive and fiber can be improved.

4. In mining and selecting coal, it can be used as a clarifier for mining wastewater and coal washing wastewater.

5. It can be used for treatment of dyeing wastewater, leather wastewater and oily waste water, so as to remove turbidity and discoloration to meet the emission standards.

6. In phosphate purification, the separation of gypsum in the process of wet phosphoric acid is helpful.

7. Water treatment flocculant used in waterworks with rivers and rivers.

Method of operation

1. When used, a water solution of 0.1% concentration should be used for the use of water with neutral non-saline debris.

2. When dissolved, the non-ionic polyacrylamide is sprinkled into the stirred water, and the speed is controlled at 100~ 300rpm. Appropriate heating (< 60 ° C), can accelerate dissolution.

3. Adjust the PH value of the treated liquid to make the non-ionic polyacrylamide play a full role (through the experiment, the optimum PH value and the dosage of non-ionic polyacrylamide) are selected.

4. When the non-ionic polyacrylamide solution is added, the mixture of the treated liquid should be accelerated and the flocculation will be followed, and the mixing rate will be slowed down, and the flocculation will increase and the settlement will be accelerated.