Polyelectrolytes are water-soluble polymers carrying ionic charge along the polymer chain. Depending upon the charge, these polymers are anionic or cationic. Polyelectrolytes are available in a wide range of molecular weights and charge densities. Homo polymers of acrylamide are also included in the family of polyelectrolytes though they do not carry any charge. These are called nonionic. Polyelectrolytes have got a wide range of applications right from water purification, oil recovery, colour removal, paper making, mineral processing, etc. Polyelectrolytes are both flocculants as well as deflocculants depending upon the molecular weight. A flocculant is essentially a solid liquid separating agent while a deflocculant is a dispersing agent.
|Cationic Polyelectrolyte Powder:|
|Ionic Character (Cationic)||low cationic|
|Use concentration suggested (g/l)||0.5|
|Concentration of Stock Solution (g/l)||3 - 5|
|Stock Solution Viscosity (cps) @5 gpl||300 – 600|
|Rapid settling.||Marked increase in underflow density|
|High filtration rate||Increased throughput|
|Improved filter clarity||Efficient filter cake washing.|
- Effective at low dosages
- Easy to prepare solution and apply
- Completely miscible with water
|Anionic Polyelectrolyte Powder :|
|Dissolution conc||0.05 -0.20|
|Effective pH range||5 – 12|
|Aqueous Solution pH (0.1%)||6 – 8|
|Molecular Weight (x104)||1900|
|Application||mining, coal washing, metal processing, etc|
NON IONIC POLYELECTROLYTE POWDER :
They are used for the same purpose with anionic polyelectrolytes ; however , nonionic polyelectrolytes do not consist of charged polymer structures whereas anionic and cationic polyelectrolytes do. They are chargeless polyelectrolytes and able to perform better than the other type of polyelectrolytes when water composition is compatible with them.
- Chemical composition :Polyacrylamide
- Appearance :White Granule
- Ionicity :Nonionic
- Bulk Density ( gr / ml ) :0.55 ~ 0.65
- pH of solution ( 250C ) :0.1%5.5 ~ 6.5
Economical to use- Effective at very low dosage levels, resulting in reduced handling and storage cost.
Works over a wide pH range and does not alter pH in the system.
Larger, faster-settling flocs are formed in gravity settling operations.
Increased filtration rates and drier cakes are produced in filtration processes. Sludges contain less ash when incinerated.
Higher solids capture, increased clarity, and greater throughput are attained in centrifugation.
Air flotation operations produce clearer underflows and grater throughput.