Axit Polyamino Polyether Methylene Phosphonic PAPEMP Polyamino Polyether Methylene Phosphonate CAS 130668-24-5

Tree Chem manufactures PAPEMP with stable composition and consistent performance for applications requiring strong scale inhibition and dispersion. PAPEMP effectively controls carbonate, sulfate, phosphate, and silica scales while maintaining strong calcium compatibility. It also chelates Fe, Mn, Zn and stabilizes metal ions in complex circulating systems.

As a light yellow to yellow transparent liquid, PAPEMP is suitable for RO pretreatment, industrial cleaning formulations, oilfield water injection chemicals, and high-hardness cooling systems. Its multifunctional chelating, dispersing, and stabilizing properties make it an excellent alternative to traditional chelating agents. For specifications or cooperation, reach us at info@cntreechem.com.

Specification

Basic Information

Technical Specification

Applications

Water treatment industry

• Polyamino polyether methylene phosphonic acid (PAPEMP) is primarily used in industrial water treatment as a high-performance scale inhibitor and corrosion inhibitor, especially under harsh conditions of high hardness, high alkalinity, high pH and high salinity. Its structure, containing multiple amino, ether and phosphonic acid groups, gives PAPEMP an extremely strong threshold effect, very high calcium tolerance and excellent chelation–dispersion ability. In industrial circulating cooling-water systems, PAPEMP controls calcium carbonate, calcium sulfate and other inorganic scales by binding Ca²⁺ and Mg²⁺, distorting crystal lattices and dispersing microcrystals so that deposits remain non-adherent and easy to carry away with the water flow. Field cases show that under continuous dosing, heat-exchanger surfaces can maintain near-design heat-transfer efficiency over long operating periods and shutdown frequency for mechanical cleaning is significantly reduced.
• A major advantage of PAPEMP in cooling-water treatment is that its performance actually improves with dosage within the normal industrial range; typical application spans 5–100 mg/L, and high-dosage programs support high-concentration cycles in recirculating systems. PAPEMP’s calcium tolerance can reach several thousand milligrams per liter, far exceeding conventional phosphonates, so it is particularly suited to high-hardness source waters and systems operating at high concentration ratios. In practice, PAPEMP is almost always combined with polycarboxylate dispersants such as AA/AMPS copolymers and sometimes with HPA or ATMP to achieve synergistic control of CaCO₃, CaSO₄ and mixed-metal oxides. Such composite formulations are widely used in chemical plants, coal-chemical circulating water, power-plant cooling towers and other large industrial installations where fouling and corrosion directly impact energy consumption and production stability.
• In boiler-water treatment, PAPEMP protects internal surfaces of boilers and economizers from scale and corrosion in high-temperature environments. Its good thermal stability allows it to resist hydrolysis at typical boiler temperatures, so it can continuously chelate Ca²⁺ and Mg²⁺ and hinder formation of dense adherent scales like calcium carbonate and calcium sulfate on tube walls. At the same time, it participates in forming a protective film on steel surfaces, reducing corrosion rates and extending inspection and cleaning cycles. These features make PAPEMP attractive for medium- and high-pressure boilers that run with high load factors and demand long-term reliability.
• PAPEMP is also widely used in oilfield water treatment, especially in injection water and produced-water recycling. In injection systems, it effectively suppresses carbonate and sulfate scaling in wellbores, pipelines and formation pores, even when total hardness exceeds 1500 mg/L as CaCO₃ and total dissolved solids are above several thousand milligrams per liter. Industrial data show that after switching to PAPEMP, the amount of scaling in injection pipelines and downhole equipment can drop dramatically, improving injection efficiency and reducing the frequency of mechanical descaling or chemical cleaning. In some oilfields, PAPEMP-containing inhibitors are also used to reduce yellowing and deposition issues in crude-handling and produced-water systems, supporting more stable long-term operation.
• In reverse-osmosis (RO) and other membrane systems, PAPEMP is recognized as a powerful antiscalant, especially for high-salinity, high-turbidity and high-temperature feeds. In complex processes such as coal-gasification wastewater treatment with “UF + RO” or multi-effect desalination, PAPEMP-based formulations suppress CaCO₃ and CaSO₄ scaling and show excellent dispersion of iron and other oxides on membrane surfaces. An example from a steel plant shows that replacing a conventional HEDP + polyacrylate program with a PAPEMP + AA/AMPS formulation significantly reduced differential pressure rise, limited flux decline to only a few percent over six months and extended cleaning intervals from a few months to nearly three times that period. These results illustrate how PAPEMP can lengthen membrane life, stabilize permeate quality and reduce overall treatment costs in brackish-water RO and high-salt wastewater reuse.

Pulp and paper industry

• In pulp and paper production, PAPEMP is used mainly as a chelating agent, dispersant, deposit controller and brightness stabilizer. Process waters, recycled fibers and fillers often introduce hardness ions and trace metals such as Ca²⁺, Mg²⁺, Fe and Mn, which can cause scale on equipment, reduce bleaching efficiency and lead to spots or discoloration in finished paper. PAPEMP complexes these metal ions, thereby reducing their catalytic activity and preventing the formation of carbonate and sulfate scale on stock pumps, headboxes, white-water lines and heat exchangers. This control of inorganic deposits helps maintain smooth machine operation, reduces unplanned downtime for cleaning and contributes to consistent sheet properties across production campaigns.
• As a dispersant and retention aid, PAPEMP improves the behavior of suspended solids, fibers, fillers and additives in the pulp slurry. By dispersing fine particles and stabilizing their distribution, it supports uniform sheet formation and enhances retention of fines and fillers on the forming wire. This leads to improved strength, opacity and printability while reducing fiber loss in white water. PAPEMP can also function as an anti-yellowing agent, slowing color reversion of certain papers during storage and use by chelating metals that would otherwise catalyze oxidative discoloration. Typical dosing levels in papermaking are in the range of 0.01–1% based on dry pulp, with the exact amount determined by water quality, furnish composition and target performance.

Textile printing and dyeing industry

• In textile printing and dyeing, PAPEMP is valued as a multifunctional auxiliary that acts as a chelating dispersant, stabilizer, anti-flocculation aid and color-fixing enhancer. Dyeing and printing systems often involve high electrolyte concentrations, variable water quality and complex formulations of dyes, thickeners and auxiliaries, all of which can promote aggregation or precipitation of dyestuffs. PAPEMP helps to uniformly disperse dyes or pigments in printing pastes and dye baths, preventing particle agglomeration and improving color levelness on fabrics. This is especially important in disperse, reactive and direct dye systems where even small degrees of non-uniformity can result in visible shade defects.
• PAPEMP also stabilizes dye or pigment dispersions during storage and processing, reducing sedimentation or creaming and maintaining consistent color strength from batch to batch. Its anti-flocculation effect is particularly valuable in high-electrolyte environments, where many conventional dispersants struggle to keep particles separated. In addition, PAPEMP improves wetting and leveling on the fiber surface, helping the colorant penetrate more uniformly and reducing streaks, barre and other unevenness in solid shades. By chelating metal ions in dye baths, it prevents undesired dye–metal complex formation that can shift color or reduce fixation, thus supporting better reproducibility and fastness.

Metal processing and surface treatment industry

• In the metal-processing sector, PAPEMP is used as a chelating component in metal cleaners, as an auxiliary in surface treatment and as a complexing agent in non-cyanide electroplating. For metal cleaning, PAPEMP is incorporated into acidic and alkaline formulations designed to remove rust, oxide scale and water-scale deposits from steel and non-ferrous surfaces. Its strong metal ion complexation enhances dissolution of oxides and mineral scales, while its dispersing action helps keep detached particles suspended, preventing re-deposition on the metal surface. This results in cleaner, more reactive surfaces for subsequent coating, plating or painting steps with reduced risk of underfilm corrosion.
• PAPEMP also participates in rust prevention and surface modification systems. Its phosphonic groups can interact with metal ions at the surface, contributing to the formation of compact, adherent films that shield the substrate from moisture and oxygen. In metal surface-treatment formulations, PAPEMP-containing cleaners and conversion coatings provide improved anti-corrosion performance and a smoother, more uniform appearance. In cyanide-free copper plating and related processes, PAPEMP may serve as part of the main complexant system to coordinate copper and other metal ions, control deposition rate, and promote uniform, dense and fine-grained deposits. This supports safer and more environmentally acceptable plating technologies without sacrificing coating quality.

Daily chemical and detergent industry

• In the daily chemical and detergent industry, PAPEMP is mainly used as a chelating and stabilizing ingredient in industrial and household cleaning products. In liquid laundry detergents, PAPEMP softens water by binding Ca²⁺ and Mg²⁺, thus enhancing the cleaning power of anionic and nonionic surfactants and reducing the formation of insoluble salts that would otherwise lead to graying, redeposition or filming on fabrics. It also protects formulations from instability caused by metal-catalyzed oxidation of dyes, perfumes and other sensitive components, helping maintain appearance and performance throughout product shelf life.
• In dishwashing detergents and household cleaners, PAPEMP plays a similar role: it complexes metal ions to prevent precipitates and supports removal of limescale and metallic soils from dishes, glassware and hard surfaces. PAPEMP-containing formulations exhibit improved clarity and reduced clouding or sedimentation over time, which is important for consumer perception. In personal-care products such as shampoos, soaps and shower gels, low levels of PAPEMP help maintain clarity, viscosity and color by controlling trace metals in both formulation and tap water, and they support consistent foam and rinse performance even in hard-water conditions. PAPEMP is also noted as a chelant and stabilizer in hair dyes and bleaching products, where it protects peroxide components from premature decomposition and contributes to predictable color-development behavior.

Pharmaceutical and other industries

• In pharmaceutical and fine chemical applications, PAPEMP is described as having certain bioactivity and potential utility in drug synthesis and modification. By forming complexes with drug molecules or metal ions, PAPEMP can influence solubility, stability and possibly biological activity, offering a route to improve drug performance or safety in targeted systems. While these applications are still more specialized compared with bulk water treatment, they highlight PAPEMP’s versatility in structure–property tuning for complex molecular systems.
• Beyond pharmaceuticals, PAPEMP is also used as an additive in lubricants to improve anti-wear, antioxidant and anti-corrosion properties, taking advantage of its metal-chelating and film-forming characteristics. In broader oil and gas operations beyond injection-water conditioning, PAPEMP-containing formulations are applied in extraction and refining processes to control scaling, mitigate equipment yellowing and maintain system cleanliness. In environmental and agricultural water-treatment scenarios, PAPEMP serves as a high-efficiency scale inhibitor and dispersant that helps maintain system efficiency while meeting increasingly strict regulatory and performance requirements.

Storage & Handling

• Store in tightly sealed plastic drums in a cool, ventilated place
• Keep away from strong oxidizers and metal salt residues
• Avoid direct sunlight and high temperatures
• Ensure equipment grounding and maintain dry, clean handling conditions

Usage Notice

• Wear protective gloves and goggles during handling
• Avoid mixing with strong oxidizers or strong bases
• Evaluate chemical compatibility before formulation
• Follow local regulations for chemical handling and disposal
• Cooling-water base program: PAPEMP is dosed at 5–100 mg/L as a stand-alone or core component scale and corrosion inhibitor in industrial circulating cooling-water systems, with performance improving as dosage increases within this range.
• Cooling-water PAPEMP + AA/AMPS blend: a formulation combining PAPEMP and AA/AMPS copolymer at around 2.5 mg/L each under about 2.5 concentration cycles gives optimum carbonate scale inhibition and metal-oxide dispersion in high-hardness, high-alkalinity recirculating circuits.
• Cooling-water PAPEMP + HPA + ATMP formulation: a composite inhibitor of PAPEMP, HPA and ATMP is designed for extremely harsh conditions of high hardness, high turbidity, high pH and high concentration ratio, allowing safe system operation without pH adjustment.
• Cooling-water PAPEMP + AA/AMPS high-iron formula: PAPEMP combined with AA/AMPS is used in high-iron, high-turbidity make-up water to control Fe₂O₃, Fe(OH)₃ and Zn(OH)₂ deposition and to support high-cycle operation without fouling.
• PAPEMP-based SPC-680 product: a proprietary inhibitor with PAPEMP as the main active component is applied to high-concentration circulating water to further enhance corrosion and scale control while reducing blowdown.
• Brackish-water RO antiscalant KC-1: an RO antiscalant formulated from AA/AMPS, PAPEMP, PBTCA and HPMA is used in brackish-water systems to provide strong CaCO₃ scale inhibition under dynamic test conditions.
• High-efficiency multifunctional RO antiscalant: a composite formulation containing roughly 5–25% EDDHA-Na, 5–20% PAPEMP, 3–12% HPMA, 2–10% AA/AMPS, 1–15% DBNPA, 0.5–8% isothiazolinone and the balance deionized or RO permeate water offers combined antiscaling and biocidal performance for RO membranes.
• Papermaking application dosing: in paper production, PAPEMP is added at about 0.01–1% based on dry pulp weight to act as a chelating, dispersing and anti-yellowing agent that stabilizes process water and improves sheet quality.
• Papermaking bleaching sequence: in an oxygen–chlorine–peroxide-enhanced alkali extraction bleaching sequence, PAPEMP is used as a chelant to stabilize bleaching chemicals and prevent metal-ion catalyzed decomposition of oxidants.
• Textile disperse-dye printing paste: a typical disperse-dye printing formulation with x% disperse dye, 3% urea, 1% ammonium sulfate, about 50% stock paste and balance water can include PAPEMP as a chelating dispersant to improve color uniformity after drying at 70–80 °C and steaming at around 180 °C.
• Generic metal-cleaning concentrates: acidic metal cleaning formulations containing phosphoric acid, nonionic surfactants and glycol ether solvents can incorporate PAPEMP as a chelating component to enhance removal of rust, scale and oxides from metal surfaces.
• Alkaline metal-cleaning agent: a metal cleaner composed of 5–15 parts polyoxyethylene ether surfactant, 15–25 parts inorganic alkali, 0.01–0.05 parts defoamer and 1–5 parts PAPEMP as complexing agent in water is used for degreasing and scale removal on metal products.
• Non-cyanide copper plating bath: a cyanide-free copper plating solution with 8–12 g/L copper, 80–250 g/L main complexant that can include PAPEMP, 20–30 g/L potassium sulfate, 40–60 g/L copper sulfate and 20–25 mL/L organic additives at pH 8.5–9.5 and 20–40 °C deposits uniform, dense copper coatings.
• General liquid detergent formulation: a liquid detergent containing 15% sodium linear alkylbenzene sulfonate, 10% fatty-alcohol ethoxylate, 5–10% sodium tripolyphosphate, 3–8% 4A zeolite, 0.1–0.5% PAPEMP, 3–5% propylene glycol and balance water plus fragrance and preservative uses PAPEMP as a chelant to maintain clarity and boost cleaning in hard water.
• Phosphate-free laundry liquid: a low-phosphorus laundry liquid with 0.1–0.5% PAPEMP, suitable levels of sodium citrate and a 3:1 anionic to nonionic surfactant ratio achieves strong detergency while replacing conventional phosphate builders.
• Household and industrial cleaning products: PAPEMP is included at about 0.1–0.5% in washing and cleaning formulations such as industrial detergents and dishwashing liquids to soften hard water, enhance surfactant cleaning power and prevent metal-ion-induced precipitation.

Packaging

• Plastic drums, 30 kg net each
• Customized packaging available upon request