Organic phosphine series scale inhibitor, organic phosphonate scale inhibitor, polycarboxylic acid scale inhibitor and dispersant, composite scale inhibitor, RO scale inhibitor
The role of scale inhibitors:
1. Organic phosphine series scale inhibitor
ATMP has good chelation, low-limit inhibition and lattice distortion. It can prevent the formation of scale, especially calcium carbonate scale, from scale-forming salts in water. ATMP is chemically stable in water and is not easily hydrolyzed. When the concentration in water is high, it has a good corrosion inhibition effect.
HEDP is an organic phosphonic acid scale and corrosion inhibitor. It can form stable complexes with various metal ions such as iron, copper and zinc, and can dissolve oxides on metal surfaces. It can still play a good role in corrosion inhibition and scale inhibition at 250 ° C. It is stable at high pH and is not easy to be hydrolyzed. It is not easy to decompose under normal photothermal conditions. Acid and alkali resistance and chlorine oxidation resistance are better than other organic phosphonic acids (salts).
EDTMPS is a nitrogen-containing organic polyphosphonic acid, which is a cathodic corrosion inhibitor. Compared with inorganic polyphosphates, the corrosion inhibition rate is 3 to 5 times higher. It is miscible with water, non-toxic and non-polluting, and has good chemical stability and temperature resistance. It still has good scale inhibition effect at 100 °C. EDTMPS can be dissociated into 8 positive and negative ions in aqueous solution, so it can chelate with a plurality of metal ions to form a plurality of monomer structure macromolecular network complexes, which are loosely dispersed in water, so that the normal crystal of calcium scale is destroyed. EDTMPS has good scale inhibition effect on calcium sulfate and barium sulfate scale.
EDTMPA has a strong ability to chelate metal ions, and the complexation constant with copper ions is the largest of all chelators including EDTA. EDTMPA is a high-purity reagent and non-toxic. It can be used as a cleaning agent for semiconductor chips in the electronics industry to manufacture integrated circuits. It is a carrier for radioactive elements in the pharmaceutical industry for the detection and treatment of diseases. The chelation ability of EDTMPA far exceeds that of EDTA. With DTPA, EDTMPA can be used in almost all places where EDTA is used as a chelating agent.
2. Organic phosphonate scale inhibitor ATMP? Na4
It is a neutral sodium salt of ATMP, which prevents the formation of scale, especially calcium carbonate scale, in scale-forming salts in water. ATMP? Na4 is suitable for circulating cooling water in thermal power plants, refineries, and oilfield refilling systems. ATMP? Na4 also has good compatibility with other additives. ATMP? Na4 is especially suitable for neutral to acidic formulations with no ammonia odor.
ATMP?Kx is a partial potassium salt solution of ATMP. Compared with the same amount of sodium salt, ATMP?Kx has higher solubility and can prevent scale formation of scale minerals in water, especially the formation of calcium carbonate scale. ATMP?Kx is especially suitable for oilfield refill systems.
HEDP? Na4 is widely used in industrial, circulating cooling water, low-pressure boilers, oilfield water injection and oil pipelines for electric power, chemical industry, metallurgy, fertilizer and other scale inhibition and corrosion inhibition.
3. Polycarboxylic acid scale inhibitor and dispersant
PAAS is non-toxic, soluble in water, and can be operated under alkaline and medium concentration conditions without scaling. PAAS can disperse crystallites or sediments of calcium carbonate, calcium sulfate and other salts in water without precipitation, thereby achieving scale inhibition purposes.
AA/AMPS is a copolymer of acrylic acid and 2-acrylamide-2-methylpropanesulfonic acid (AMPS). Because the molecular structure contains a carboxylic acid group with good scale inhibition and dispersion property and a strong sulfonic acid group, it can improve the calcium tolerance, and has significant scale inhibition effect on calcium phosphate, calcium carbonate and zinc scale in water, and is dispersed. Excellent performance. Combined with organic phosphine, the synergistic effect is obvious. It is especially suitable for water with high pH, ​​high alkalinity and high hardness. It is one of the most ideal scale inhibitors and dispersants for high concentration multiple operation.
PESA is a non-phosphorus, non-nitrogen "green" environmentally friendly multi-scale scale inhibitor. PESA has good scale inhibition and dispersion properties for calcium carbonate, calcium sulfate, barium sulfate, calcium fluoride and silicon scale in water, and the scale inhibition effect is better than the common organic phosphine scale inhibitor. PESA has a good synergistic effect with phosphonate compounding. At the same time, PESA has a certain corrosion inhibition effect and is a multi-component scale inhibitor.
PASP is a water-soluble polymer and is a new type of green water treatment agent with phosphorus-free, non-toxic, pollution-free and fully biodegradable properties. It has strong chelating ability to ions, has the dual effects of corrosion inhibition and scale inhibition, and has good scale inhibition effect on scale-forming salts such as calcium carbonate, calcium sulfate, barium sulfate and calcium phosphate, and the scale inhibition rate of calcium carbonate. Up to 80%.
4, composite scale inhibitor
TH-503, a special corrosion and scale inhibitor for boilers, is a composite of high-polymers such as organic phosphonic acid and polycarboxylic acid. It has high corrosion and scale inhibition properties, and its temperature resistance is particularly good, which can be effectively applied. Water treatment in the furnace of a low pressure boiler.
The special scale inhibitor for heat network is mainly composed of high-efficiency dispersant, phenolic hydroxyl group, sulfonic acid group, etc. It has lattice distortion effect on scale-forming factors such as calcium carbonate and calcium sulfate in water, so that the scale is not easily adsorbed on the wall. , loosely dispersed in water, showing excellent scale inhibition.
The corrosion and scale inhibitor TH-601 consists of organic phosphonic acid, polycarboxylic acid, carbon steel corrosion inhibitor, etc. It has good chelation and dispersion effect on calcium carbonate and calcium phosphate in water and has good properties for carbon steel. Corrosion inhibition effect, mainly used for corrosion and scale inhibition of circulating cooling water system in steel plants, with good corrosion inhibition effect and strong scale inhibition.
The corrosion and scale inhibitor TH-604 is compounded with organic phosphonic acid, polycarboxylic acid, carbon steel corrosion inhibitor and copper corrosion inhibitor. It has good chelation to calcium carbonate, calcium sulfate and calcium phosphate in water. It has a dispersion effect and has a good corrosion inhibition effect on carbon steel and copper.
The corrosion and scale inhibitor TH-604 is mainly used for corrosion and scale inhibition of circulating cooling water systems, such as power plant, chemical plant, petrochemical, steel and other circulating cooling water systems. Corrosion and corrosion inhibitor TH-604 has good corrosion inhibition effect and scale inhibition. Strong.
This product is mainly composed of a variety of organic phosphine carboxylic acids, polycarboxylic acids, sulfonate-containing copolymers, corrosion inhibitors, special surfactants, etc. It is suitable for circulation of high concentration ratio of Ca2++ alkalinity requirement of 1500 ppm in circulating water. Cooling water system.
5, RO scale inhibitor
Reverse Osmosis Scale Inhibitor and Dispersant TH-0100 is a high-efficiency scale inhibitor suitable for reverse osmosis (RO) systems and nanofiltration (NF) and ultrafiltration (UF) systems to prevent fouling of membrane surfaces. Improve water production and water quality, and reduce operating costs.
Reverse osmosis scale inhibitor and dispersant TH-2000 is a high-efficiency scale inhibitor and dispersant. It is especially suitable for reverse osmosis system with high content of bismuth and antimony in reverse osmosis feed water, and high tendency for scale formation of barium sulfate and barium sulfate. It effectively prevents fouling from occurring over a wide range of concentrations of fouling materials. Reverse osmosis scale inhibitors are used in reverse osmosis systems (RO), nanofiltration systems (NF) or ultrafiltration systems (UF).
6, special scale inhibitor
Sodium benzotriazole (BTA): BTA (Na) can adsorb a thin film on the surface of metal to protect copper and other metals from atmospheric and harmful media; BTA (Na) in circulating cooling water system It can be used together with a variety of scale inhibitors and bactericidal algaecides. It has good corrosion inhibition effect on circulating cooling water system, and the dosage in circulating water is 2-4mg/L. BTA (Na) can also be used as a copper-silver anti-tarnishing agent, automotive coolant, and lubricating oil additive.
Sodium mercaptobenzothiazole (MBT): MBT (Na) can be used as a copper corrosion inhibitor in circulating cooling water systems. MBT (Na) corrosion inhibition mainly relies on the chemical adsorption of active copper atoms or copper ions on the surface of metallic copper; or further chelation to form a dense and strong protective film, so that the copper equipment can be obtained. Good protection, the amount is generally 4mg / L, MBT (Na) can also be used as a plasticizer, acid copper plating agent.
Methyl benzotriazole (TTA): TTA can be used as a corrosion inhibitor for non-ferrous metals such as copper and copper alloys, and also has a corrosion inhibition effect on ferrous metals. TTA adsorbs a thin film on the metal surface to protect copper and other metals from harmful media in the atmosphere and water. The film is more uniform in film formation, and it is better combined with mercaptobenzothiazole sodium. TTA is dissolved in alcohol or alkali and added to circulating water. The concentration of this product in water is 2-10mg/L. If the non-ferrous metal in the water system is seriously corroded, it can be added 5-10 times of normal concentration to make the system passivate quickly. .
Hydrochloric acid pickling inhibitor: Pickling corrosion inhibitor is a series of products, which are imidazolines. When the metal is washed with hydrochloric acid, the acid corrosion inhibitor is added to inhibit the corrosion of the steel by hydrochloric acid. The pretreatment of the pickling inhibitor is that the cleaning medium is hydrochloric acid, sulfuric acid or sulfamic acid, and the substrate to be cleaned is ferrous metal. Pickling corrosion inhibitors are suitable for pickling of various types of high, medium and low pressure boilers, as well as pickling of large equipment and pipes. Corrosion performance in acid solution (dosing amount is 1-3‰) Corrosion speed ≤1g/m2?h
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