Duracon NF2 3840C50

Summary

Product identification

The Duracon NF2 Series comprises proprietary thin-film nanofiltration (NF) membrane elements characterized by an approximate molecular weight cut-off of 150-300 Dalton for uncharged organic molecules. These membranes preferentially reject divalent and multivalent ions, while monovalent ion rejection depends on feed concentration and composition, allowing systems to operate at lower feed pressures than RO systems.

Key features and compliance:

• Minimum rejection: 96% on 2,000 ppm MgSO₄ at 25°C and 110psi.
• Designed for daily Clean-in-Place (CIP) and periodic hot-water sanitation.
• Applications: Typically used in food-related processes, including sugar monosaccharide purification and sugar fractionation.
• Construction: Features a Durasan* Cage patented outerwrap, a selection of feed spacers, and polysulfone parts.
• Compliance:
  • FDA Regulations (relevant sections of 21CFR)
  • EU Framework 1935/2004/EC
  • Halal & Kosher certification

Element Specifications (Selected Models):

• Duracon NF2 3840C50
  • Membrane: Thin-film membrane (TFM*)
  • Spacer: 50 mil (1.27 mm)
  • Active area: 55 ft² (5.1 m²)
  • Part number: 1207025
• Duracon NF2 8040C35
  • Membrane: Thin-film membrane (TFM*)
  • Spacer: 35 mil (0.89 mm)
  • Active area: 343 ft² (31.9 m²)
  • Part number: 1227615
• Duracon NF2 8040C50
  • Membrane: Thin-film membrane (TFM*)
  • Spacer: 50 mil (1.27 mm)
  • Active area: 275 ft² (25.6 m²)
  • Part number: 1256119

Operating limits

• Typical Operating Pressure: 140-800 psi (966-5,514 kPa)
• Maximum Operating Pressure: 1,200 psi (8,273 kPa)
• Maximum Temperature: 150°F (65°C)
• pH Range: 3.0-9.0
• Chlorine Tolerance: 500 ppm-hours (dechlorination recommended)
• Operating pressure (bar) multiplied by operating temperature (°C) should not exceed 2000.

Product water

• Clean Water Flux (CWF): 18 GFD (30 LMH) @ 110psi
• Typical Operating Flux: 5-20 GFD (8-34 LMH)
• After repeated 90°C sanitization cycles, approximately 30% of the original permeate flow rate may be lost before element performance stabilizes (over 90% of this reduction occurs during the first heat treatment). With this loss of permeate flow rate, the salt rejection increases.

Mechanical / hydraulic

Maximum Pressure Drops:

• Over an element:
  • 0°C-50°C: 15 psig (103 kPa)
  • 51°C-65°C: 7 psig (48 kPa)
• Per housing:
  • 0°C-50°C: 60 psig (414 kPa)
  • 51°C-65°C: 30 psig (207 kPa)

Dimensions and Weight:

• Duracon NF2 3840C
  • Length (A): 38.75 inches (98.4 cm)
  • Diameter (B): 0.833 inches (2.12 cm)
  • Diameter (C): 3.79 inches (9.6 cm)
  • Boxed Weight: 7 lbs (3.2 kg)
• Duracon NF2 8040C
  • Length (A): 40.00 inches (101.6 cm)
  • Diameter (B): 1.125 inches (2.86 cm)
  • Diameter (C): 7.91 inches (20.1 cm)
  • Boxed Weight: 35 lbs (15.9 kg)

CIP and Hot Water Sanitization

• Initial Flushing: New elements must be flushed with clean water (RO permeate strongly preferred) for at least an hour, at a transmembrane pressure not exceeding 45 psi (3 bar), to remove residual chemicals.
• System Operation Pre-Sanitization: The system must be started and in operation for a minimum of 24 hours prior to hot water sanitization. If new elements are to be hot water sanitized before first use, the system must be flushed at low transmembrane pressure (up to 45 psi (3 bar)) for a minimum of 24 hours prior to sanitization.
• Transmembrane Pressure during HW Sanitization: Should be maintained as low as possible, not exceeding 45 psi (3 bar).
• Cross Flow Pressure Drop during HW Sanitization: Should not exceed 2 psi per element or 10 psi per housing.

CIP Limits for NF elements:

• At 50°C (122°F): pH Minimum 2.0, pH Maximum 10.5
• At 45°C (113°F): pH Minimum 2.0, pH Maximum 11
• At 35°C (95°F): pH Minimum 1.5, pH Maximum 11.5
• At 25°C (77°F): pH Minimum 1.0, pH Maximum 11.5

Hot Water Sanitization Procedure Highlights:

1. Elements that have been in operation should be cleaned with an approved CIP procedure to remove any mineral scales or organic foulants, then thoroughly flushed for at least an hour.
2. Increase system temperature from room temperature to the target sanitization temperature (up to 90°C/194°F) at a rate not higher than 5°C/9°F per minute. Maintain the target temperature for 30 to 60 minutes. Duracon elements can withstand 90°C sustained for over 60 minutes.
3. Cool the system to room temperature at a rate not higher than 5°C/9°F per minute.

Disclaimer: This summary is based on extracted text and may not include all figures, footnotes, or the latest revisions present in the complete OEM PDF datasheet. For contractual purposes, always refer to the specific OEM PDF revision used for your project.

Official datasheet (PDF)

PDF datasheet