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Re: Dolomite CO2 generator (was APD V3 #1078

Hello Roger,

Pressure equalization would certainly work -- you would be able to
adjust the drop rate, at least for a period of time.

Another thing that I would worry about in the dolomite/HCl CO2 generator
is that hydrochloric acid is a GAS and, if its concentration is high
enough, it readily comes out of solution. 

So, it might happen, that you would be adding HCl, along with CO2, to
your tank. Not an encouraging prospect.



> DIYers,
> Bob Dixon has on a couple occasions floated the idea that CO2 could be
> generated by dripping hydrochloric acid over dolomite or limestone chips.
> The last time this came up I commented that I considered the design a
> few times and couldn't think of a practical way to do it without using a
> dosing pump to feed the acid.  Gravity feed alone couldn't be used because
> the acid would have to drip into a pressurized container.
> This afternoon in my office (while enjoying a MicroSoft moment - i.e.
> downtime) it suddenly occured to me how the method might be made to work.
> If a a gas line is run from the pressurized reactor to the top of the acid
> reservoir there will be equal pressures in the acid reservoir and at the
> acid outlet.  That way gravity feed should work.
> Of course, this will put some highly corrosive material under pressure,
> with a chance for serious problems.  But, what the heck...
> Roger Miller