XUS290504

Summary

Product identification

• DOW™ Specialty Membrane XUS290504 Nanofiltration Element.
• High Temperature Nanofiltration Element offering distinct features:
  • Up to 70°C continuous operating temperature capability due to distinct element and membrane design.
  • Robust DOW FILMTEC™ nanofiltration membrane sheet.
  • The 34 mil feed spacer allows for maximum active membrane surface area while lessening the impact of fouling, reducing the pressure drop across the pressure vessel and enhancing cleaning effectiveness.
• Typical applications include:
  • Waste brine recycling from sugar decolorization.
  • Concentration of thin juice sugars or components in chemical processing.
  • Sulfate removal in Chloralkali process streams.

Mechanical / hydraulic

• DOW™ Specialty Membrane XUS290504
  • Active Area: 70 ft² (6 m²)
  • Feed Spacer Thickness: 34 mil
  • Minimum ATD OD: 3.9 in.
  • ATD included: Yes
• Element Dimensions (XUS290504)
  • A: 40.0 in (1016 mm)
  • B: 1.03 in (26 mm)
  • C: 0.75 OD in (19 OD mm)
  • D: 3.9 in (99 mm)
• DOW HYPERSHELL™ 4040 elements are designed to fit standard 4040 pressure vessels.

Operating limits

• Maximum Operating Temperature: 70°C (158°F)
• Maximum Operating Pressure at 80°C: 28 bar (406 psi)
• Maximum Single Element Pressure Drop < 50°C: 0.9 bar (13.1 psi)
• Maximum Single Element Pressure Drop < 80°C: 0.3 bar (4.4 psi)
• Maximum Vessel Pressure Drop < 50°C: 4.1 bar (60 psi)
• Maximum Vessel Pressure Drop < 80°C: 1.2 bar (17 psi)
• pH Range, Continuous Operation (<35°C): pH2 – pH11
• pH Range, Continuous Operation (35°C to 50°C): pH3 – pH10
• pH Range, Continuous Operation (< 70°C): pH4 – pH8
• Hydrogen Peroxide Limit: 20 ppm
• Free Chlorine Tolerance: Below Detectable Limits
• Maximum Feed Silt Density Index (SDI₁₅): SDI 5

Clean in Place (CIP) parameters

• Maximum CIP Pressure: 15 to 75 psi (1 to 5 bar)
• pH Range, Cleaning (45°C to 50°C): pH1.8 – pH11.0
• pH Range, Cleaning (< 45°C): pH1 – pH13
• Hydrogen Peroxide Limit, Short-Term Cleaning: 1,000 ppm

Important Start-Up Information

• New elements are normally cleaned prior to initial use.
• Avoid abrupt pressure or cross-flow variations on the spiral elements during start-up, shutdown, cleaning or other sequences to prevent possible membrane damage.
• During start-up, a gradual change from a standstill to operating state is recommended:
  • Feed pressure should be increased gradually over a 30-60 second timeframe.
  • Before initiating cross-flow at high permeate flux conditions, the set operating pressure should be maintained for 5-10 minutes.
  • Cross-flow velocity at set operating point should be achieved gradually over 15-20 seconds.
  • Avoid permeate-side backpressure at all times.
  • Any concentrate or permeate obtained from the first hour of operation should be discarded.
• Keep elements moist at all times after initial wetting.
• To control the spread of biological growth during system shutdowns, it is recommended that elements be immersed in a preservative solution.

Disclaimer: This summary is based on the provided text extract. The original PDF may contain additional figures, footnotes, or revisions not included here. For contractual data, please refer to the specific OEM PDF revision used on your project.

Official datasheet (PDF)

PDF datasheet