What techniques are available to separate/filter gases?

[pa5tabear]

If you have a flowing gas stream, with multiple species, how many different techniques are there to separate species or particulates?

I know you can:

-use centrifugation or similar techniques to separate based upon density

-use a molecular sieve to separate based upon particle size

-use an electrical or magnetic field to separate based upon charge differences

-use another chemical to bond/react with a target species



Is there anything else I'm missing? Or suggestions on where to read about this?

 

[jedishrfu]

how about distillation?

 

[pa5tabear]

how about distillation?

This would require a phase change to liquid, wouldn't it?

But yes, I guess that still counts.

Thanks!

 

[kateman]

You could move them through a vacuum and separate based on their relative velocities

 

[Ygggdrasil]

Gas chromatography
http://en.wikipedia.org/wiki/Gas_chromatography

 

[NascentOxygen]

Exploit different solubilities.

 

[Borek]

http://en.wikipedia.org/wiki/Gas_separation
http://en.wikipedia.org/wiki/Pressure_Swing_Adsorption
http://en.wikipedia.org/wiki/Vacuum_swing_adsorption

And cryogenic distillation.