Instructions for Use of Polyhydric Alcohol Phosphate Ester (PAPE)

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Polyhydric Alcohol Phosphate Ester (PAPE) is a high-performance, multifunctional scale and corrosion inhibitor. Because its structure incorporates multiple polyethylene glycol (polyoxyethylene) chains along with phosphate ester groups, it demonstrates high calcium tolerance, superior scale inhibition against BaSO4 and SrSO4, and excellent dispersion properties compared to traditional monomeric phosphonates.

Below are the standard technical specifications, dosing guidelines, application instructions, and handling protocols for industrial water treatment systems.

1. Technical Specifications

Parameter Standard Quality Index
Appearance Colorless to pale yellow transparent liquid
Active / Solid Content (%) 50.0%
Total Phosphoric Acid (PO43-, %) 30.0%
Organic Phosphonic Acid (PO43, %) 15.0%
Density (20°C) 1.25 g/cm3
pH (1% aqueous solution) 1.5 – 3.0

2. Dosing Guidelines & Application Parameters

Dosing varies based on water quality parameters (alkalinity, hardness, silica, and pH) and whether the primary target is scale suppression or corrosion control.

1.Determine Dosage Rates：Based on system type。

  • Open Recirculating Cooling Water: Add 5 – 15mg/L (ppm) when targeting scale control. Higher dosages (15 – 30mg/L) are used if the goal is combined corrosion protection in soft, corrosive water.

  • Closed-Loop Systems: Maintain 50 – 150+mg/L for heavy corrosion protection (steel/copper).

  • Oilfield Water Injection / Squeeze: Dosed continuous or batch-wise at 10 – 50mg/L downhole (commonly used as a direct alternative to commercial oilfield additives like Nalco Visco 953).

2.Solution Preparation & Dosing Point：Continuous Feed Setup。

  • Dilution: PAPE is miscible in water in all proportions. It can be dosed neat or pre-diluted in a chemical feed tank using soft or RO water.

  • Addition Point: Inject continuously via a metering pump at a point of high turbulence (e.g., cooling tower basin pump suction or make-up line) to ensure immediate dispersion.

3.System Control & Formulation Synergies：Target pH 7.0 – 8.5。

  • pH Control: Operates effectively across a broad pH spectrum, with pH  7.0 – 8.5 ideal for combined scale and corrosion control.

  • Formulation Blending: PAPE exhibits strong compatibility with polycarboxylic acid dispersants (e.g., AA/AMPS, PAAS, TERPOLYMER), phosphonates (HEDP, PBTC), and zinc salts.

  • Quaternary Compatibility: Unlike many polycarboxylates or organophosphonates, PAPE can be co-formulated with cationic biocides (like DDBAC/benzalkonium chloride) without forming precipitates.

3. Key Application Scenarios

  • High-Barium & High-Strontium Waters: Excellent choice for oilfields and mining circuits where BaSO4 and SrSO4 scales render traditional phosphonates ineffective.

  • Oily Wastewater / Refinery Cooling: Demonstrates superior film-forming and dispersant action in cooling water streams prone to oil or hydrocarbon leaks.

  • Low-Phosphorus Discharge Environments: Delivers carbon steel corrosion protection equivalent to higher-phosphorus packages, making it easier to meet local environmental phosphate discharge caps.

4. Packaging, Storage & Safety Protocols

  • Storage Compatibility: Standard product is acidic (pH 1.5 – 3.0). Store in plastic-lined tanks, HDPE, polypropylene, or FRP containers. Avoid prolonged contact with unlined mild steel or galvanized equipment.

  • Packaging & Shelf Life: Typically supplied in 25kg / 200kg plastic drums or 1000kg IBC totes. Shelf life is 10–12 months in a cool, ventilated area away from direct sunlight.

  • PPE & First Aid: Wear chemical-resistant gloves, safety goggles, and face shields when handling concentrate. In case of skin or eye contact, flush immediately with plentiful clean water for at least 15 minutes and seek medical evaluation if irritation persists.

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