What techniques are available to separate/filter gases?

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Discussion Overview

The discussion focuses on various techniques available for separating or filtering gases within a flowing gas stream that contains multiple species. Participants explore theoretical and practical methods for gas separation, including physical, chemical, and phase change techniques.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant mentions centrifugation to separate based on density.
  • Another suggests using a molecular sieve for particle size separation.
  • A method involving electrical or magnetic fields for separation based on charge differences is proposed.
  • It is noted that chemical reactions could be used to bond with target species for separation.
  • Distillation is brought up as a technique, with a clarification that it requires a phase change to liquid.
  • Another participant suggests moving gases through a vacuum to separate based on relative velocities.
  • Gas chromatography is mentioned as a separation technique.
  • Different solubilities are proposed as a basis for separation.
  • References to gas separation methods such as pressure swing adsorption and cryogenic distillation are provided.

Areas of Agreement / Disagreement

Participants present multiple techniques for gas separation, and while there is some overlap in suggestions, no consensus on a definitive list of methods is reached. The discussion remains open with various competing views on the effectiveness and applicability of the mentioned techniques.

Contextual Notes

Some techniques mentioned may depend on specific conditions or assumptions not fully explored in the discussion, such as the physical state of the gases or the specific application context.

pa5tabear
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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?
 
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jedishrfu said:
how about distillation?

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

But yes, I guess that still counts.

Thanks!
 
You could move them through a vacuum and separate based on their relative velocities
 
Exploit different solubilities.
 

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