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RE: [PSUBS-MAILIST] CO2 scrubber
Here is some stuff I got off the net.
When I was a kid, I used quicklime (calcium oxide) or slaked lime (calcium
hydroxide), both of which were available cheaply in technical grade (along
with inert substances like sand, alumina, rust or magnesium oxides. Slaked
lime is basically the hydrated version of quck or burnt lime, and is the
active ingredient in soda lime.
You can get quicklime or slaked lime from many sources: garden shops, large
hardware stores, cement mixing plants --and nowadays, the food grade version
called "cal" is widely available for home tortilla makers. Almost every city
has a local tortilla factory that will sell you a few pounds very cheaply
out of their bulk stock (but don't let "food grade" make you careless: the
stuff is still dangerous, if taken directly internally vs. used sparingly in
food prep, where it is largely neutralized and/or washed out before
consumption)
Calcium hydroxide is less caustic than soda lime, which includes the more
potent sodium and potassium hydroxides as well. Slaked lime can also be
largely regenerated several times for reuse by baking at kitchen oven
temperatiures. Soda lime may regenerate bettter (I'm guessing) due to the
excess of stronger hydroxides, but though lye and potash lye (sodium and
potassium hydroxides, respectively) were readily available, I didn't feel
any need to add them: a 25 lb bag of lime lasted me years.
What about using drierite instead of soda lime? It can be regenerated:
http://envsupport.licor.com/docs/Ascarite_Note.pdf
Hugh
-----Original Message-----
From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Alan James
Sent: Sunday, 20 June 2010 10:56 a.m.
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] CO2 scrubber
Hugh
I've seen slaked lime (calcium hydroxide) at 22c a kilo. I wonder why
they charge so much for what we buy?
Alan
----- Original Message -----
From: "Hugh Fulton" <hc.fulton@gmail.com>
To: <personal_submersibles@psubs.org>
Sent: Sunday, June 20, 2010 10:09 AM
Subject: RE: [PSUBS-MAILIST] CO2 scrubber
> Anything can be done with power to burn. CO2 scrubbing is done with water
> at elevated pressures in biogas treatment on large scales using tower
> fillers such as the rings. Generally done more effectively at just over
> 1000 psi.
> Also CO2 levels from 20-30% scrubbing down to 3-5% from memory. Not
> viable
> with p-subs. Why aren't the sofnolimes of the world out of business?
> Because it is the best system. More to the point is how can we regenerate
> the 'limes in a safe and effective way. Now that is a better thread to
> follow. At $15 per kilo it would be nice to stick it in the oven, or
> whatever it takes for 10 minutes to bring it back. Hugh
>
>
>
> -----Original Message-----
> From: owner-personal_submersibles@psubs.org
> [mailto:owner-personal_submersibles@psubs.org] On Behalf Of Alan James
> Sent: Sunday, 20 June 2010 8:06 a.m.
> To: personal_submersibles@psubs.org
> Subject: Re: [PSUBS-MAILIST] CO2 scrubber
>
> Hi Jim,
> It sounds like it wouldn't be very energy efficient for our psubs.
> If we are pumping 160 liters of air a minute through our scrubbers,
> (deep worker figures) then we would have to push the same amount
> of air but above ambient seawater pressure to mix with outside water
> or draw the water into the hull & then pump it out, wouldn't we?
> Alan
>
> ----- Original Message -----
> From: "Jim Rudholm" <jimrudholm@gmail.com>
> To: <personal_submersibles@psubs.org>
> Sent: Sunday, June 20, 2010 4:23 AM
> Subject: [PSUBS-MAILIST] CO2 scrubber
>
>
>> http://www.gizmag.com/dixon-ring-co2-scrubbing-system/15473/
>>
>>
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