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CO2 Filtering to use?

CO2 Filtering to use? - Chemistry Forum

CO2 Filtering to use? - Chemistry Forum. Discuss chemical reactions, chemistry.


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  #1  
Old 08-19-2003, 02:31 AM
Demšlitišn Man
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Default CO2 Filtering to use?



I am currently looking for any system to filter and store CO2 and/or
NO2 out of thin air. Or I would be willing to ferment or compost
materials of high carbon output, but I essentialy am looking for free
CO2. Would not have to be of best quality at first, but eventually
could be compressed to above liquid state. Please respond, and tell me
I'm and idiot if I am
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  #2  
Old 08-19-2003, 07:09 AM
Mike Darrett
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Default CO2 Filtering to use?

[Only registered users see links. ] (Demšlitišn Man) wrote in message news:<836b2e7d.0308181831.3da9e5a9@posting.google. com>...

Scrubbing air with sodium hydroxide comes to mind.

And then the question becomes, "How much energy is required in the
manufacture of said sodium hydroxide?"

Why not just ferment sugar cane, and collect the carbon dioxide?

Mike
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  #3  
Old 08-19-2003, 05:58 PM
Demšlitišn Man
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Default CO2 Filtering to use?

"John F. Porter" <kejfp@ust.hk> wrote in message news:<bhsvp4$jvs$1@news.ust.hk>...

I actually am looking for a way to bottle the CO2 for personal use. I
am going to be using the CO2 for some mini-guns (bb style), and a
CryO2 sytem for car cooling. I was hoping someone on the sci.chem
forums would know how to capture the CO2 created in fermentation or
free use for storage and compression. I guess I would need liquid CO2,
but very pure CO2 just above liquid level would do, as I can compress
that too. Maybe I should try the mech usenet area?

Thanks for all the help you two have given me, but helping the
environment I can live without (j/k)
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  #4  
Old 08-20-2003, 03:11 AM
Eric Lucas
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Default CO2 Filtering to use?


"Demšlitišn Man" <[Only registered users see links. ]> wrote in message
news:836b2e7d.0308181831.3da9e5a9@posting.google.c om...

You need to resign yourself to one immutable fact...it will *not* be free.
Separating CO2 is entropically uphill, and by the second (?) law of
thermodynamics, this will require an input of energy. Even if you use a
membrane, you still have to have a pressure differential to run the
membrane, which means running either pumps or compressors. As for practical
ways to minimize the cost, others will be probably have better ideas than I
do, but keep in mind that a producer like Air Products or Praxair may be in
a better position to minimize those costs (economies of scale, better
efficiency, etc.)

Eric Lucas


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  #5  
Old 08-21-2003, 07:08 PM
William David Thweatt
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Default CO2 Filtering to use?

=?ISO-8859-1?Q?Dem=F0liti=F0n_Man?= (jache@bawilson.net) wrote:
: "John F. Porter" <kejfp@ust.hk> wrote in message news:<bhsvp4$jvs$1@news.ust.hk>...
: > Dem?liti?n Man <jache@bawilson.net> wrote:
: > > I am currently looking for any system to filter and store CO2 and/or
: > > NO2 out of thin air. Or I would be willing to ferment or compost
: > > materials of high carbon output, but I essentialy am looking for free
: > > CO2. Would not have to be of best quality at first, but eventually
: > > could be compressed to above liquid state. Please respond, and tell me
: > > I'm and idiot if I am
: >
: > Hot carbonate solutions can absorb CO2 (and some other acid
: > gases) from gaseous mixtures
: >
: > K2CO3 + CO2 + H2O = 2 KHCO3
: > absorption - >
: > <- regeneration
: >
: > Amines (e.g. DEA) are commonly added to speed up the process.
: >
: > google gives 7440 hits for the Benfield process, the first one -
: > [Only registered users see links. ]
: > - gives some recent technical variations on the original version.

: I actually am looking for a way to bottle the CO2 for personal use. I
: am going to be using the CO2 for some mini-guns (bb style), and a
: CryO2 sytem for car cooling. I was hoping someone on the sci.chem
: forums would know how to capture the CO2 created in fermentation or
: free use for storage and compression. I guess I would need liquid CO2,
: but very pure CO2 just above liquid level would do, as I can compress
: that too. Maybe I should try the mech usenet area?

: Thanks for all the help you two have given me, but helping the
: environment I can live without (j/k)

If you have the right kind of compressor, you can make liquid air, then
let the O2 and N2 boil off, leaving a trace of CO2 as dry ice. Actually,
you can just buy some dry ice.

Actually, CO2 is cheap as Hell, why don't you just buy a tank and a
regulator?

--
--
William "Dave" Thweatt
Robert E. Welch Postdoctoral Fellow
Chemistry Department
Rice University
Houston, TX
[Only registered users see links. ]
[Only registered users see links. ]
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