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Honeywell. High Temperature Membrane for OBIGGS Application Lisbon 11/15/2004 Jim Zhou. Outline. Objectives Why high temperature membrane? Fiber spinning conditions Test results Conclusions. Objectives. Objectives

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honeywell
Honeywell

High Temperature Membrane for OBIGGS Application

Lisbon

11/15/2004

Jim Zhou

outline
Outline
  • Objectives
  • Why high temperature membrane?
  • Fiber spinning conditions
  • Test results
  • Conclusions
objectives
Objectives
  • Objectives
    • To develop a high temperature gas separation hollow fiber membrane suitable for the OBIGGS application
  • Why high temperature membrane?
    • Reduce the size and volume of the OBIGG system by taking advantage of higher gas permeability at higher temperatures and reduced cooling requirements at higher OBIGGS operating temperature
membrane material selection
Membrane Material Selection

Honeywell’s Innovative High Temperature Membrane

  • High O2, N2 permeability
  • High O2/N2 Selectivity
  • Wet spun with very thin selective layer to increase flux
  • Less susceptible to contaminants
  • Large operating temperature and pressure range
membranes and membrane modules
Membranes and Membrane Modules

Nitrogen

Oxygen

Water Vapor

Nitrogen

Oxygen and water vapor are “fast” gases which quickly permeate the membrane, allowing nitrogen to flow through the fiber bores as the product stream.

Feed Air

This illustration shows how fast gases like oxygen and moisture permeate the surface of the individual membrane fibers while nitrogen molecules remain inside and are delivered as the product gas.

membranes and membrane modules1
Membranes and Membrane Modules

End Plate

EnrichedNitrogenProductGas

Epoxy Tube Sheet

Support Core

Epoxy TubeSheet

Oxygen-Enriched Air

Hollow Fibers

Feed Air

O-Rings

Thousands of individual fibers wrapped around a core make up the nitrogen generating hollow fiber membrane module. The engineering of the module is important to maximizing the performance of the whole system.

fiber spinning conditions
Fiber Spinning Conditions

Phase inversion/Wet spinning process

  • Pros
    • Can produce membrane with extremely thin selective layer (Asymmetrical membrane structure)
  • Cons
    • Porous support layer may not be stable at high temperatures
    • Complex spinning and solvent leaching process
    • Membrane selectivity changes with the amount of solvent left behind
typical fiber spinning conditions
Typical Fiber Spinning Conditions
  • Fiber spinning condition ranges
      • Polymer dope rate: 1.2 to 2.5 g/min/per strand
      • Speed: 75 to 250 ft/min(23 to 76 m/min)
      • Center solvent rate: 0.5 to 2.0 ml/min
      • Temperature: Room to 100oC
      • Fiber ID: 100 to 160 micron
      • Fiber OD: 150 to 300 micron
membrane structure
Membrane Structure
  • Thin skin layer with porous support
  • High gas flux
conclusions
Conclusions
  • Membrane is stable at operating temperatures up to 160C
  • Membrane flux increase with increase temperature
  • Membrane performance influenced by spinning conditions
  • High temperature membrane offers advantages over conventional membranes
slide15

The Fourth Triennial International Aircraft Fire and Cabin Safety

Research Conference

The Fourth Triennial International Aircraft Fire and Cabin Safety

Research Conference