I. Technical Characteristics and Advantages of PAPEMP
The molecular structure of PAPEMP simultaneously incorporates amino (-NH₂), ether (-O-), and phosphonic acid (-PO₃H₂) groups. This synergistic interaction of multiple functional groups confers three core advantages:
Ultra-high Chelating Capacity: PAPEMP exhibits a calcium ion chelation stability constant in the 10⁻⁵ range, significantly surpassing EDTA (10⁻¹⁰ range). In a water injection system at a certain oilfield, at a calcium ion concentration of 1200 mg/L, just 8 mg/L of PAPEMP reduced calcium carbonate scale deposition by 92%, whereas EDTA at the same concentration only achieved a 65% reduction2809-21-4.
High calcium tolerance: PAPEMP exhibits calcium tolerance exceeding 3000 mg/L, 15 times that of HEDP (200 mg/L). In a steel plant’s reverse osmosis system with feedwater TDS reaching 4500 mg/L, a composite formulation of PAPEMP 5 mg/L + polycarboxylate 3 mg/L increased system recovery from 75% to 85% and extended membrane element cleaning cycles to 6 months.
Environmental Friendliness: PAPEMP exhibits approximately 40% biodegradability (OECD 301F standard), significantly outperforming EDTA (<10% biodegradability). Its molecular structure lacks nitrogen-phosphorus double bonds, reducing risks of water eutrophication.
II. Typical Application Scenarios and Engineering Cases
Case 1: Circulating Cooling Water System in Power Industry
A thermal power plant’s circulating cooling water system uses Yellow River water as makeup water, with water hardness as high as 800 mg/L (as CaCO₃) and summer temperatures reaching 45°C. The original treatment regimen of HEDP 20 mg/L + polyacrylic acid 10 mg/L still resulted in frequent condenser scaling issues, with an end difference (difference between exhaust steam temperature and cooling water outlet temperature) of 8°C. After switching to PAPEMP, only 8 mg/L dosage achieved:
92% reduction in calcium carbonate scale deposition (verified by X-ray diffraction analysis)
3°C decrease in condenser end difference (5% energy savings)
Extended continuous operation cycle to 180 days (from 90 days)
This case demonstrates PAPEMP’s exceptional performance in high-temperature, high-hardness water conditions. Its calcium ion chelation capability eliminates the need for frequent system shutdowns and cleaning.
Case 2: Yellowing Inhibition in Textile Dyeing
A dyeing plant using EDTA as a chelating agent for cotton fabrics experienced a 15% yellowing rate due to EDTA forming colored complexes with iron ions. After switching to PAPEMP at 3 mg/L:
Yellowing rate reduced to below 2% (verified by Datacolor colorimeter)
Dye utilization increased by 10% (reducing wastewater color intensity)
Chemical cost per ton of fabric decreased by 8 yuan
PAPEMP’s ether-based structure preferentially chelates heavy metal ions in water, preventing their binding with dye molecules and thereby resolving yellowing issues.