[Gasification] Pure H from Water Gas after eggshells used to stripCO2

[Mark Ludlow]

CO2 passes freely through egg shell. This is what is responsible for the
rise in pH of eggs during storage. There's huge amount of CaCO3 in the
ecosphere and more being formed every second.

However, there's really no calcium oxide freely available in nature. You can
make it by heating CaCO3 to 850C, but this is far from a free ride. Calcium
oxide absorbs both CO2 and H2O (with a large evolution of heat).

Mark

-----Original Message-----
From: gasification-bounces at listserv.repp.org
[mailto:gasification-bounces at listserv.repp.org] On Behalf Of drewrt
Sent: Friday, September 28, 2007 8:48 AM
To: gasification at listserv.repp.org
Subject: [Gasification] Pure H from Water Gas after eggshells used to
stripCO2

An interesting news article

> Chemical and biomolecular engineer L.S. Fan and former doctoral 
> student Mahesh Iyer, came up with the idea when they were trying to 
> improve a method of hydrogen production called the water-gas-shift 
> reaction. With this method, fossil fuels such as coal are gasified to 
> produce carbon monoxide gas, which then combines with water to produce 
> carbon dioxide and hydrogen.


> The process works because eggshells are mostly made up of calcium 
> carbonate - a very absorbent material. Calcium carbonate is a common 
> ingredient in calcium supplements and antacids. When calcium carbonate 
> is heated, it becomes calcium oxide, which will then absorb acidic gas 
> such as carbon dioxide.
>
> Calcium carbonate captures 78 per cent of carbon dioxide by weight, 
> said Fan. That means given equal amounts of carbon dioxide and 
> eggshell, the eggshell absorbs 78 per cent of the carbon dioxide.
>
>
> http://www.cbc.ca/technology/story/2007/09/27/eggshells.html



Drew

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