How can i separate water vapor from biogas

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Discussion Overview

The discussion centers on methods for separating water vapor from biogas, exploring various techniques and considerations related to the process. The scope includes practical applications and theoretical approaches to biogas purification.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant suggests that water vapor can be separated from biogas through condensation.
  • Another participant mentions that freezing or condensation is a viable method, noting that the useful components of biogas have higher boiling points than water.
  • There is a proposal to use chemicals like MgSO4 for water absorption, although concerns about energy consumption and practicality for large quantities are raised.
  • A participant questions the feasibility of using a flash tank for separation, indicating that it could be used under higher pressure to condense water vapor.
  • Another response suggests that a normal tank might suffice for condensation without the need for specialized flash tank equipment.
  • A participant inquires about the possibility of using a demister made of steel wool in a Pressure Swing Adsorption (PSA) system to purify biogas from water vapor, seeking opinions on its effectiveness.

Areas of Agreement / Disagreement

Participants express various methods for separating water vapor, but there is no consensus on the best approach. Multiple competing views and techniques remain under discussion.

Contextual Notes

Some methods discussed may depend on specific conditions such as pressure and temperature, and the practicality of certain chemical methods is questioned. The effectiveness of proposed solutions like the demister remains uncertain.

Who May Find This Useful

Individuals interested in biogas purification, environmental engineering, or those conducting research related to biogas systems may find this discussion relevant.

Abdallah
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Hi
I need to know how i can separate the water vapor from biogas
i know that there is separation of H2S and Co2
but what the procedure to remove water vapor from biogas ?
thank you :)
 
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Welcome to PF;
[W]hat [is] the procedure to remove water vapor from biogas ?
You condense it out.
 
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Condensation or freezing is a way to go.
Bio-gas (at least the useful bits of it) is methane maybe some ethane and rarely some propane. All with a boiling point higher than waters freezing point. Or higher pressure to induce condensation. There are chemicals like MgSo4 (dehydrated) that can absorb water although their dehydration is energy consuming and not practical for large quantities.
 
thank you
but can i use flash tank to separate it ??
 
Flash tanks are usually use for evaporating a process that is not necessary. You could use the tank to pump the gas at higher than normal pressure (check the tank specs) which would condense the water. The tank should be cooled not heated.

A normal tank should do, no need for the whole flash tank gear.
 
hi, can you build a demister in PSA system? I am doing my thesis on biogas and was wondering if I can build a demister using a steel wool to purify biogas from water vapour. Do you think it will help?
 

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