[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: membrane reactor for CO2 (was APD V4 #14


This sure sounds like a gadget with a semipermeable silicone membrane.

About 25-30 years ago, many newspapers carried a picture of a gerbil in
a cage, under water, inside an aquarium with fish. Two sides of the cage
were covered by the membrane and enough oxygen diffused into the cage,
and CO2 out of the cage, so the gerbil could live there "indefinitely"
(food limited).

The CO2 diffuses through the membrane into the water. The reaction at
the membrane surface (water side) is

CO2 + H2O --> H2CO3 = carbonic acid (or CO2 dissolved in water).

Water movement removes the H2CO3 from the membrane, disturbing the
equilibrium, causing more CO2 to diffuse ....

With a tight system there should be NO loss of CO2 -- 100% utilization.

Whether this gadget is practical, cost effective, etc. -- that's another
question. A properly sized bell should do just as well.



> Date: Fri, 7 Jan 2000 10:10:49 -0500
> From: "Monolith Marine Monsters (m3)" <puffie at marine-monsters_com>
> Subject: RE: What is a membrane reactor for CO2?
>   >Date: Thu, 6 Jan 2000 16:41:44 -0500 (EST)
>   >From: wshimoda at alum_mit.edu
>   >Subject: What is a membrane reactor for CO2?
>   >
>   >I found a 'membrane reactor, double' at pets.com listed under
>   >their 'live plants supplies' section and was wondering if anyone
>   >knew what it was, how it worked, how well it worked, etc.?
>   >
>   >Thanks,
>   >Wade
> That should be the one made by Aqua Medic which is to be used with their
> chemical CO2 reactor the Ceomat.  The Ceomat is a relatively low pressured
> CO2 system, I doubt that if the membrane reactor is suitable to be used with
> other high pressured CO2 systems.  We used to sell those membrane reactors
> in the past.  They consist of a few whitish membrane and no microbubbles
> could be seen on its reactive side (as told by Ceomat users).  The
> instruction claims that CO2 reacts w/ H2O behind the membrane, etc.
> Edward
> Monolith Marine Monsters
> http://www.marine-monsters.com/fresh.html