Duracid NF2540F30

Summary

Product identification

• Product Line: Duracid Series Industrial acid stable nanofiltration elements
• Membrane Type: Proprietary thin-film nanofiltration membrane, Duracid, Thin-film membrane (TFM*)
• Molecular Weight Cut-Off: Approximately 150-200 Dalton for uncharged organic molecules
• Key Characteristics:
  • Engineered to operate continuously under extreme acid conditions (pH at or below zero).
  • Divalent and multivalent ions are preferentially rejected.
  • Monovalent ions and mineral acids commonly have full transmission (transmission can vary depending upon feed concentration and composition).
  • Mineral acids and monovalent ions have minor contribution to osmotic pressure.
• Applications: Acid purification, metals concentration in low pH streams.
• Construction Materials: Patented feed spacers, polysulfone parts, fiberglass outer wrap. All materials of construction are low pH tolerant.
• Features & Benefits:
  • Extreme low pH stability
  • 100% wet testing Quality Assurance
  • Durable construction
  • High temperature compatibility
• Markets:
  • Metal Surface Treatment / Coating / Galvanic
  • Heap Leaching Process in Mining
  • Phosphate-based Chemical Production
  • Spent Acid Recovery

Operating limits

• Typical Operating Pressure: 400 – 800 psi (2758 – 5516 kPa)
• Maximum Operating Pressure:
  • 1200 psi (8,273 kPa) @ T < 77°F (25°C)
  • 800 psi (5,515 kPa) @ T < 122°F (50°C)
  • 600 psi (4,137 kPa) @ T < 158°F (70°C)
• Maximum Temperature:
  • Continuous operation: 158°F (70°C)
  • Clean-In-Place (CIP): 158°F (70°C)
• Continuous pH: < 10 (up to 70°C)
• CIP pH:
  • < 11.0 @ T < 113°F (45°C)
  • < 10.5 @ T < 131⁰F (55°C)
  • < 10.0 @ T < 158°F (70°C)
• Chlorine Tolerance: 500 ppm x hours (dechlorination recommended)

Feed water

• Pre-conditioning: A 5-minute pure water flush at a minimum pressure of 500 psig (3447 kPa) at ambient temperature is required to optimize flow and rejection performance.
• Typical Process Streams (Acid Concentration):
  • HCl: 5-37%
  • H₂SO₄: 5-20%
  • H₃PO₄: 5-20%
• Membrane Metal Rejection (Based on flat sheet test conducted at 25°C (77°F) under 400 psig operating pressure in a dead-end filtration mode):
  • Fe²⁺ (2000 ppm): >90% in 5% H₂SO₄, >85% in 5% H₃PO₄
  • Al³⁺ (2000 ppm): >90% in 5% H₂SO₄, >85% in 5% H₃PO₄
  • Cu²⁺ (2000 ppm): >90% in 5% H₂SO₄, >85% in 5% H₃PO₄
  • Cd²⁺ (100 ppm): >90% in 5% H₂SO₄, >85% in 5% H₃PO₄
  • Ni⁺ (2000 ppm): >90% in 5% H₂SO₄, >85% in 5% H₃PO₄

Product water

• Typical Operating Flux: 5 – 14 GFD (9 – 24 LMH)
• Clean Water Flux (CWF): 10-19 GFD (17-32 LMH) @ 225 psi (1551 kPa). (CWF is the rate of water permeability through the membrane after cleaning at reproducible temperature and pressure. It can vary ±25%.)
• Average MgSO₄ Rejection: 98% (Measured on pre-conditioned elements after 24 hours operation; testing conditions: 2,000 ppm MgSO₄ solution at 110 psi (760 kPa) operating pressure, 77°F (25°C), 15% recovery.)

Mechanical / hydraulic

• Model: Duracid NF2540F30
  • Dimensions (Male, Figure 1):
    • A: 40.0 inches (101.6 cm)
    • B: 0.75 inches (1.9 cm)
    • C: 2.4 inches (6.1 cm)
  • Boxed Weight: 4 lbs (1.8 kg)
  • Spacer: 30 mil (0.76 mm)
  • Active Area: 28 ft² (2.6 m²)
  • Outer Wrap: Fiberglass
  • Part Number: 1231058
  • Average Permeate Flow (measured on pre-conditioned elements after 24 hours operation):
    • 155 gpd (0.6 m³/day) (Testing conditions: 2,000 ppm MgSO₄ solution at 110 psi (760 kPa) operating pressure, 77°F (25°C), 15% recovery.)
    • 560 gpd (2.1 m³/day) (Testing conditions: 3% glucose solution at 440 psi (3034 kPa) operating pressure, 77°F (25°C), 15% recovery.)
  • Maximum Crossflow: 7 gpm (1.6 m³/hr)
• Maximum Pressure Drops:
  • Over an element:
    • 15 psig (103 kPa) for 0°C-50°C
    • 7 psig (48 kPa) for 51°C-70°C
  • Per housing:
    • 60 psig (414 kPa) for 0°C-50°C
    • 30 psig (207 kPa) for 51°C-70°C

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Disclaimer: This summary is based on the provided text extract and may not include all figures, footnotes, or the most recent revisions of the OEM PDF datasheet. For contractual data, please refer to the specific OEM PDF revision used on your project.

Official datasheet (PDF)

PDF datasheet