본문 바로가기


Membrane Technology – Principle
Gas separation membranes are very fine hollow fibers through which different mixtures of gases are fed. As the gases travel through the tubes, a process called selective permeation (Diffusion-Sorption) allows us to separate gases using.

At a closer look, gas separation membrane, the wall of each of these micro-thin hollow fibers, is an asymmetric filter made of various types of polymer. As different gases travel through the fiber, they come into contact with the membrane and permeate through it.

The permeation rate of each gas is determined by its solubility in the membrane material and its diffusion rate. Gases with higher solubility and smaller molecules (fast gases) can pass through the membrane faster than other less soluble gases with generally larger molecules (slow gases).

Gases which permeate faster and more are collected outside of the hollow fiber as permeates while gases which do not permeate so well and stay inside of the fiber until they reach the other end are separated out as retentates. Depending on the properties of the desired gas, either or both of permeates and retentates can be used.

For instance, if we want to separate methane from carbon dioxide for biogas upgrading, we would feed biogas through the membrane filter. Since carbon dioxide (CO2) permeates through the membrane much faster than the heavier methane (CH4), we get carbon dioxide ‘filtered’ out of the membrane fiber as permeate and methane staying inside the hollow fiber as retentate; methane is then collected at the end of the membrane filter.
Membrane Technology - Benefits
  • Simple and Reliable Design
    · No auxiliary media (water, solvents, etc.) required
    · Simple modular set-up without break-in period
    · Compact system with low space requirements
    · Easy to start and stop operation at short intervals
    · Durable module design guarantees long working life
      even in taxing conditions
  • Flexible Application
    · Modular design allows easy expansion
    · Flexible integration with the main system
    · Easy to adjust purity
    · Flexible installation positioning
  • Economic Solution
    · Simple design reduces mechanical requirements
    · Low installation costs
    · Short installation time
    · Low operational costs
    · Low maintenance requirements: time and costs saved
  • Improved Safety
    · No risks associated with handling gas cylinders
    · No chemicals required
  • Environmental Friendly Benefits
    · Separation at room temperature: low energy consumption
    · No phase change
    · No environmental emissions (no waste water or absorbent)
    · No additional supply materials required: no secondary pollution
Membrane Separation Process
Gas Separation Membrane