Duracon NF1 3840C50

Summary

Product identification

The Duracon NF1 Series consists of 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. Monovalent ions passing through the membrane do not contribute to osmotic pressure, allowing operation at lower feed pressures than RO systems. Duracon D-Series membrane has a minimum rejection of 98% on 2,000 ppm MgSO₄ at 25°C and 110 psi operating pressure.

Duracon NF1 Elements are designed for food-related processes requiring stringent sanitary procedures, including daily Clean-In-Place (CIP) and periodic hot-water sanitization (HWS). Applications include:

• Demineralization
• De-acidification
• Sugar concentration

Features:

• Durasan* Cage patented outerwrap
• Selection of feed spacers
• Polysulfone parts
• Membrane type: D-series, thin-film membrane (TFM*)

Compliance and Certifications:

• FDA Regulations relevant sections of 21CFR
• EU Framework 1935/2004/EC
• Halal & Kosher certification

Element Specification

Mechanical / Hydraulic

Dimensions and Weight

Maximum Pressure Drops

Operating limits

• Typical Operating Pressure: 140-800 psi (966-5,516 kPa)
• Typical Operating Flux: 5-20 GFD (8–34 LMH)
• Clean Water Flux (CWF): 14 GFD (24 LMH) @ 110 psi (CWF is the rate of water permeability after cleaning, and can vary ±25%. It is important to monitor CWF after each cleaning cycle.)
• Maximum 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)
• The product of operating pressure in bar and operating temperature in degrees Celsius should not exceed 2000.

CIP Parameters

Hot Water Sanitization

Preparation and Flushing:

• New elements must be flushed with clean water (RO permeate preferred) for at least one hour at a transmembrane pressure not exceeding 45 psi (3 bar) to remove residual chemicals.
• The system must operate 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 a low transmembrane pressure (up to 45 psi / 3 bar) for a minimum of 24 hours prior to sanitization.

Sanitization Procedure:

1. Elements that have been in operation should first be cleaned using an approved CIP procedure to remove scales or foulants, then thoroughly flushed for at least one hour.
2. Increase system temperature from room temperature to the target sanitization temperature (up to 90°C / 194°F) at a rate not exceeding 5°C / 9°F per minute. Maintain the target temperature for 30 to 60 minutes.
3. Cool the system to room temperature at a rate not exceeding 5°C / 9°F per minute.

Pressure and Flow during HWS:

• Transmembrane pressure during HWS should be maintained as low as possible, not exceeding 45 psi (3 bar), while ensuring some permeate flow for effective sanitization on the permeate side.
• Cross flow to the system should be monitored and adjusted so that the pressure drop is not more than 2 psi per element or 10 psi per housing.

Impact on Performance: Repeated 90°C sanitization cycles can lead to a loss of permeate flow rate. Under optimum conditions in a controlled environment with deionized water, approximately 30% of the original permeate flow rate was lost before the element performance stabilized after repeated heat treatments (over 90% of this reduction occurred during the first treatment). With this loss of permeate flow rate, the salt rejection increases. The rate of cooling and heating was not more than 5°C per minute, and the differential pressure drop per element did not exceed 2 psi during these tests.

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

Official datasheet (PDF)

PDF datasheet