EDTMPS Technical Specifications

Here are the detailed technical specifications for EDTMPS (Ethylenediamine Tetra(methylene Phosphonic Acid Sodium Salt):

1. Basic Chemical Properties

Property Specification

CAS No. 1429-50-1 (Sodium salt) / 2067-79-0 (Acid form)

Molecular Formula C₆H₁₂N₂O₁₂P₄Na₄

Molecular Weight 612.0 g/mol

Appearance Clear to pale yellow liquid or white crystalline powder

Active Content 30-50% (liquid), ≥90% (solid)

pH (1% aqueous solution) 9.5-11.5

Density (20°C, liquid) 1.30-1.40 g/cm³

2. Performance Characteristics

Parameter Value

Phosphorus content (as PO₄³⁻) 24-26%

Calcium chelation value ≥450 mg CaCO₃/g

Thermal stability Stable to 100°C (short-term to 120°C)

Effective pH range 2-12 (optimal 7-9)

Chlorine tolerance Poor (degrades at >1 mg/L residual chlorine)

3. Typical Impurity Limits

Impurity Maximum Level

Chloride (Cl⁻) ≤0.5%

Iron (Fe) ≤10 ppm

Heavy metals (as Pb) ≤5 ppm

Water insoluble matter ≤0.1%

4. Storage & Handling

Storage temperature: 5-40°C (avoid freezing)

Packaging:

Liquid: HDPE drums (200L, 1000L IBC)

Solid: 25kg woven bags with PE liner

Shelf life: 2 years (liquid), 3 years (solid)

5. Typical Applications & Dosage

Application Dosage (active ingredient)

Cooling water systems 5-20 mg/L

Boiler water treatment 2-10 mg/L

RO membrane antiscalant 1-5 mg/L

Oilfield scale control 10-50 mg/L

6. Safety & Regulatory

Safety: Non-flammable, non-explosive

Handling: Use PPE (gloves, goggles)

Regulatory:

REACH registered

NSF/ANSI 60 certified options available

Meets ISO 9001 quality standards

Key Advantages

Excellent scale inhibition for CaCO₃, CaSO₄, BaSO₄

Good synergies with zinc and polymer corrosion inhibitors

Cost-effective phosphonate option

Limitations

Poor resistance to chlorine/oxidizers

Not biodegradable

Limited effectiveness in high calcium (>500 mg/L as CaCO₃) systems