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Introduce
Polyacrylamide referred to as PAM, is a linear polymer and one of the most widely used water-soluble polymer species, PAM and its derivatives can be used as effective flocculants, thickener, paper intensifier and liquid drag reduction agent, etc. It’s also widely used in water treatment, paper making, petroleum, coal, mining and metallurgy, geology, textile, construction and other industrial sectors.
Specifications and Technical data
Index | Anionic polyacrylamide | Non-ionic polyacrylamide | Cationic polyacrylamide |
Appearance |
White powder | ||
Size, mm | ≤ 2 | ||
% Solids content | ≥88 | ||
min Dissolve time | ≤1.5 | ||
% Insoluble | ≤2 | ||
Molecular weight (ten thousand) | 600-2000 | 800-1500 | 10-50% Ion concentration |
% Hydrolyzing degree | 13-30 | 5-15 | 5-50 |
Physical properties and Properties for use:
Physical properties:
Formula (CH2CHCONH2)
PAM is a kind of linear polymers, it is easily soluble in water, almost insoluble in benzene, ethylbenzene, esters, acetone and other general organic solvents, its solution is the almost transparent viscous liquid, is a non-dangerous goods, no toxic, non-corrosive. Solid PAM has hygroscopicity, moisture absorption increases with the increase of ionic degrees. PAM has a thermal stability, the stability also good when heated to 100 ° C, but easy to decomposes of nitrogen above 150 ° C. It would not soluble in water when the role of intermolecular imidization occurs, density (g) ml 23 ° C 1.302. Glass transition temperature is 153 ° C, PAM performance non-Newtonian liquidity under the stress.
Properties for use:
1) Flocculence: PAM allows suspended material through the electrical neutralization, has the effect of bridging adsorption and flocculation.2) Adhesiveness: played the role of adhesion through mechanical, physical, chemical activity.3) Drag reduction: PAM can effectively reduce the fluid friction resistance; add dram of PAM into water can be able to reduce 50-80%.
4) Thickening: PAM has the thickening effect in both neutral and acidic conditions; it’s easily for PAM hydrolyzes when the PH value in more than 10 ° C; the thickening effect will be more obvious when it shows half-mesh structure.
Anionic polyacrylamide can choose different molecular weights for use according to different uses and users of the product performance requirements.
1. For industrial wastewater treatment, especially works well for suspended particles, coarse, high concentrations of particles with a positive charge, PH value of water is neutral or alkaline waste water effluent, such as sewage treatment like steel mills, electroplating plant wastewater, metallurgical waste, and coal washing wastewater.
2. Drinking water treatment. Many sources of China's water plant are the river, so the content of sediment and mineral are really high, compare turbidity. Though filtered through the sediment, it is still failed to reach a desired standard, and mainly in need of dosing flocculant in order to make the water to clear. A lot of water plant using inorganic flocculants, but it doesn’t work well for the large dosage resulting in increased volume of sludge. To make use of anionic polyacrylamide flocculants, inorganic flocculation dosage is one of the 50 points, but the effect of inorganic flocculants to a few times several times, especially my company's production of polyacrylamide, the residual monomer has been reached food-grade (less than 0.05%), close to foreign advanced level, non-toxic, is more appropriate for treatment of drinking water and the effect will be more better for the organic polluting river water and the anionic polyacrylamide used in conjunction.
3. used for the recovery of the loss of starch and the lees of the starch factory and alcohol plant. Now the wastewater of many manufacturers has a high starch content, it’s a pollution of environment and a waste of resources. So we can dose PAMC into the wastewater to make the starch deposition, and then precipitate into a cake through the filter press it can be used for feed. A large number of the distiller's grain of ethanol plant is processed using this technology; one of Asia's largest ethanol plants in Heilongjiang is using PAM as flocculant on the recovery of lees, and has made great economic benefits. 4. Used as oilfield plugging agent and oil displacement agent of tertiary recovery. 5. Used as a paper-making additives, APAM was widely used in the paper-making aspect, can be used as dispersant in making long-fiber paper, wet and dry enhancer, retention, filter aids and paper waste water flocculants, etc.
Cationic polyacrylamide (CPAM):
Main application:
1. For sludge dewatering. This product can be selected according to the nature of the sludge; sewage sludge can be effectively dehydrated before the sludge take into the filter press. The resulting floc is large and non-stick filter cloth when dehydrating, filter press hard when to leave and flow thick mud cake , dehydration with high efficiency, mud cake moisture content of 80% or less.
2. For domestic sewage and organic wastewater treatment. This product showed an electropositive nature in acid or alkaline medium, so the clarification are very effective for sewage coagulation and sedimentation with pairs of particles suspended in water which with negative ion. Such as production of grain alcohol, water, paper waste, urban sewage treatment plant waste water, beer, water, monosodium glutamate factory waste water, sugar waste water, waste water with high organic content, beverage waste, textile printing and dyeing wastewater etc. using cationic polyacrylamide effect several times or several ten times higher than use anionic, non-ionic acrylic acid amine or inorganic salts since such waste generally negatively charged. 3. Used as flocculants for river water to tap water treatment. It has a good effective with less dosage, so the cost is low. It’s especially better to multiple use with inorganic coagulant, it will be the high effectively flocculants for ruling the Yangtze River, Yellow River and other water works. 4. Penetration enhancer for papermaking and other additives. 5. Chemical auxiliary for the oil field, such as the clay anti-swelling agent, thickening agent for oil acidification
Cationic polyacrylamide