Spiral wound Membranes for high temperature

Spiral wound Membranes for high temperature

Membrane elements of the DURATHERM series were designed for high temperature applications:

• Continuous operation T >50°C
• Upper limit T = 90°C

• Duratherm elements are constructed with the greatest care, using high quality materials in compliance with the FDA Code of Federal Regulations, Vol. 21
• The structure of Duratherm elements consists of a patented DURASAN® outer cage to ensure sanitary conditions; controlled flow is also maintained on the outer surface of the element, eliminating the concentrate gasket.

The DURATHERM family line - temperature limits for 3 models:

DURATHERM Membranes - offer

• Thin-film RO
• Thin-film NF
• Polyethersulfone UF

DURATHERM sizing parameters

• Do not exceed 33 l/(hxm2) or 2000 Wagner Units
• Max pressure drop (bar) vs. Temp (°C)

DURATHERM Applications:

• Purification of condensate from boilers and evaporators
• Concentration of hot liquids (integration or replacement of evaporators)
• Treatment of viscous liquids

DURATHERM HWS elements: Hot Water Sanitizing procedure:

• The elements must be clean
• The increase and decrease of temperature up to 80 - 90°C must occur with a maximum gradient of 5°C/min
• Even lower temperatures are effective for the inactivation of the cells
  - 10 min at 70°C inactivates bacteria + yeasts
  - 30 min at 62°C inactivates virus + mould

• Alternating cycles of cooling/heating also inactivate (do not kill) spores
• The pressure must be as low as possible!
  - P < 1.5 bar for MF + UF
  - P < 3 bar for NF + RO

• Cross flow velocity must be low
  - pressure drop <0.15 bar per element

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