PESA antiscalant dispersant is a nitrogen-free, non-phosphorus organic compound that combines the functions of scale inhibition and corrosion inhibition. The PESA polycarboxylic has good biodegradability and is suitable for high alkali and high metal content water systems. PESA is a green water treatment chemical.
The PESA antiscalant dispersant here refers to polyepoxysuccinic acid sodium. The abbreviation of this antiscalant dispersant is PESA. The molecular formula is HO(C4H2O5M2)nH, where M can be replaced by H, Na, K, where n=2~10.
1. PESA Scale Inhibition Performance
Experiments show that PESA polycarboxylic has a solubility limiting effect on the deposition of calcium sulfate scale. The scale inhibition rate increases with the increase of the dosage. When reaches a certain concentration, the scale inhibition ability no longer significantly increases.
The effect of PESA on calcium carbonate scale is better than some commonly used polycarboxylic acid, sulfonate and polyphosphate scale inhibitors.
The main scale inhibition mechanism of PESA is as follows:
Some of the reactive groups in the scale inhibitor have a certain chelating power to the cations in the scale. Therefore, chelation can occur. So after joining PESA polycarboxylic. It can block some of the cations in the scale. The reaction of the cation with the anion is inhibited, thereby preventing fouling.
(2) Low Dose Effect
It means that the addition of a small amount of PESA antiscalant dispersant can inhibit the crystallization of a large amount of scale ions. The scale inhibition effect shown by this.
This is because in supersaturated solutions, there are a large amount of small crystal scale smaller than the critical radius. Since the added scale inhibitor has a special adsorption capacity for the crystal nucleus and the active point of the crystal in the small crystal. It can be adsorbed on it by physical or chemical action. The interface can be greatly increased. The higher the interface energy, the larger the critical radius of the crystal. The more difficult it is for small crystals to precipitate out of the water. Thereby achieving a macroscopic low dose effect.
(3) Lattice Distortion
When the crystal grows, the crystal lattice is first grown at the kinked position of the crystal. Moreover, the kink position is the most stable position on the crystal interface. When the solution is a supersaturated solution, the probability of the slightly soluble salt molecules reaching the kink position is greatest. Thus the crystal can grow normally.
When the PESA antiscalant dispersant in the solution, it will adsorb in the crystal kink position. The crystal growth is inhibited due to the lattice position occupying the normal growth of the crystal. Thereby greatly destroying the regularity of the crystal and deforming the crystal lattice.
The shape of the crystal due to distortion is very irregular. It is difficult to form a hard scale by an orderly close arrangement. Even if the scale is generated, it can only be loose soft scale. PESA thus achieves the purpose of scale inhibition.
2. PESA Corrosion Inhibition Performance
When PESA polycarboxylic is used alone, the lower amount has a certain inhibition effect on carbon steel. As the concentration of PESA increases, its corrosion inhibition also increases. The corrosion rate of carbon steel is gradually reduced and the corrosion inhibition rate is increased.
To achieve better corrosion inhibition, the required concentration of PESA is higher. When PESA chemical is used as a corrosion inhibitor alone, its performance is inferior to other organic phosphoric acid corrosion inhibitors. However, because it does not contain phosphorus, it can be compounded with other agents to form a low-phosphorus or phosphorus-free organic corrosion inhibitor.
The study found that PESA has a good synergistic effect with inorganic phosphates, organic phosphates, benzotriazoles and the like. The corrosion inhibition effect after compounding is obviously enhanced.
|Appearance||Colorless or amble transparent liquid|
|Solid Content, %||≥ 40|
|Density (20℃), g/cm3||≥ 1.28|
|pH (1% water solution)||9.0-12.0|