Cationic Polyacrylamide

Polyacrylamide Physico-chemical Properties

Molecular Formula：[CH2CH(CONH2)]n

Molar Mass：71.0785

Density：1.3

Water Solubility：SOLUBLE

Solubility：is a water-soluble polymer

Appearance：White or milk-colored flowable powder

Storage Condition：Room Temprature

Sensitive：Easily absorbing moisture

MDL：MFCD00084392

Physical and Chemical Properties：density 1.3
water SOLUBLE

Cationic polyacrylamide (CPAM) is a linear polymer compound, because it has a variety of active groups, can be affinity with many substances, adsorption to form hydrogen bonds. It is mainly flocculated negatively charged colloid, with turbidity removal, decolorization, adsorption, bonding and other functions, suitable for dyeing, paper making, food, construction, metallurgy, mineral processing, coal powder, oil fields, aquatic processing and fermentation industries with high organic colloid content of wastewater treatment, especially suitable for urban sewage, urban sludge, paper sludge and other industrial sludge dewatering treatment.

Product characteristics

1, good water solubility, can also be completely dissolved in cold water.

2, add a small amount of cationic polyacrylamide products, can be subjected to great flocculation effect. Generally, it only needs to add 0.01~10ppm(0.01~10g/m) to fully play its role.

3, the use of cationic polyacrylamide products and inorganic flocculants (polyferric sulfate, polyaluminum chloride, iron salts, etc.), can show greater results.

Degree of hydrolysis

The degree of hydrolysis of the so-called polyacrylamide refers to the ability of weak ions in the polyacrylamide solution to combine with water to form a weak alkali or weak acid, or the strength of the formation of weak acid and the ability to form a weak base in the polyacrylamide solution. For strong acids and bases, the greater the degree of ionization, the stronger the corresponding acid and base, and the weaker their degree of hydrolysis. For some soluble polyacrylamides, the greater the degree of ionization corresponds to the more ionized ions, and the weaker their degree of hydrolysis. In general, the greater the degree of ionization, the weaker their degree of hydrolysis, on the contrary, the smaller the degree of ionization, the greater the degree of hydrolysis.

Cationic polyacrylamide has the following functions:

1, clarifying and purifying effect;

2, settlement promotion;

3, filtration promotion;

4, thickening and other effects.

Therefore, it can fully meet the requirements of waste liquid treatment, sludge concentration and dehydration, mineral processing, coal washing, paper making and other aspects.

Product performance

1, PAM has a unique decolorization ability, mainly used in dye plant high chroma wastewater decolorization treatment, applicable dyes for reactive, acidic and disperse dyes.

2, can also be used for textile, printing and dyeing, ink and other industrial wastewater treatment.

3. The decolorization rate of wastewater can reach more than 95%, and the removal rate of COD is between 40-70%.

1) Polyacrylamide is an organic polymer compound, can be divided into anionic polyacrylamide, cationic polyacrylamide and non-ionic polyacrylamide, for white powder or particles, soluble in water, but the dissolution rate is very slow;

2) Anionic polyacrylamide is generally used for wastewater treatment flocculant, cationic type is generally used for sludge dehydration;

3) The amount of drug used as a flocculant is generally 1-2ppm, that is, the amount of drug used for each treatment of 1 ton of wastewater is about 1-2G;

4) When used, anionic type is generally prepared into an aqueous solution of about 0.1%, and cationic type can be prepared into 0.1%-0.5%;

5) When preparing the solution, you should first add water in the dissolving tank, then turn on the mixer, and then add PAM slowly along the vortex, PAM can not be quickly put in at one time, otherwise PAM will caked to form "fish eyes" and cannot be dissolved;

6) After adding PAM, generally continue to stir for more than 30 minutes to ensure that it is fully dissolved;

7) Dissolved PAM should be used as soon as possible, anionic type generally do not exceed 36h, cationic type is easily hydrolyzed after dissolution, should be used within 24h.

solubility

As a polymer cationic polyacrylamide dissolution rate factors mainly involve the following two factors:

1. Molecular diffusion

The dissolution process of a substance is the interpenetration and diffusion process of solute and solvent molecules, so the movement ability of solute and solvent molecules is an important factor affecting the solvent time. Because the solute molecule is much larger than the solvent molecule in size, the diffusion rate of the two is very different. In the initial phase of dissolution, there is actually only the unilateral diffusion of water molecules to polyacrylamide, and polyacrylamide molecules cannot be diffused in the direction of water, so the first swelling is the necessary stage of dissolution.

2. Hydrogen bonding and entanglement

Hydrogen bonds can be formed between the amide side groups within and between the molecular chains of polyacrylamide. Hydrogen bond is the strongest intermolecular force, and there are a lot of hydrogen bonds in high molecular weight polyacrylamide chains. At the same time, the molecular chain of high molecular weight polyacrylamide is very long, and the long molecular chain must be curled, and they must be entangled together. Therefore, the rapid dissolution of polyacrylamide depends on the rapid infiltration and attack of solvent water molecules, net hydrogen bond dissociation and molecular chain unentanglement.

The dissolution rate of polyacrylamide is related to its molecular weight, ionic degree, molecular geometry, dissolution temperature, stirring and feeding method.

The dissolution rate slows down with the increase of molecular weight and the degree of chemical crosslinking, and the overall cross-linking will make the polyacrylamide first swell and not dissolve. In the manufacturing process of powder production, high drying temperature and long drying time can make the product branch or slightly cross-linked, and prolong the dissolution time and even some insoluble matter. Some manufacturers due to the immature production process, there will be a very slow dissolution rate, dissolve a certain amount of insoluble matter after a certain time.

The increase of dissolution temperature and stirring rate is conducive to molecular diffusion, while the dissolution rate. However, the higher dissolution temperature (above 50 degrees Celsius) and the strong stirring rate will degrade the polyacrylamide and deteriorate the performance. This is particularly prominent for powder type products.

use

1) For sludge dewatering according to the nature of the sludge can choose the corresponding model of this product, can effectively dehydrate the sludge before the sludge enters the filter press, dewatering, the production of large floc, non-stick filter cloth, not dispersed during the filter press, thick mud cake, high dehydration efficiency, mud cake moisture content below 80%.

2) For the treatment of domestic sewage and organic wastewater, this product in the coordination or alkaline medium are positive, so the sewage suspended particles with negative charge flocculation precipitation, clarification is very effective. Such as the production of food alcohol wastewater, paper waste water, urban sewage treatment plant wastewater, beer wastewater, monosodium glutamate wastewater, sugar wastewater, organic content of high wastewater, feed wastewater, textile printing and dyeing wastewater, cationic polyacrylamide than anionic, non-ionic polyacrylamide or inorganic salt effect is several times or tens of times higher, because such wastewater is generally negative charge.

3) It is used as a treatment flocculant for tap water with river water as the source of water, with small dosage, good effect and low cost, especially when combined with inorganic flocculant, it will become an efficient flocculant for the treatment of water works in the Yangtze River, Yellow River and other basins.

4) Reinforcing agents and other auxiliaries for paper making. Increase the retention rate of fillers, pigments, etc., and the strength of paper.

5) For oil field economic additives, such as clay anti-swelling agent, oil field acidification thickening agent.

6) Used for textile sizing agent, stable slurry performance, less pulp, low fabric breakage rate, clean cloth.