Sequestration of carbon dioxide -Using chemistry to save the world

limestoneby Alison Christine

Mining Baking Soda From Greenhouse Gas Emissions
[Via Big Think]

What’s the Latest Development? This week San Antonio, TX saw construction begin on what will be the first-ever commercial plant designed to capture carbon dioxide from the atmosphere and turn it into baking soda, hydrogen gas, and chlorine gas. The aptly-named Skymine plant will work alongside a cement works, where it will treat emissions with sodium hydroxide to create the products, which can then be used in industrial and commercial applications.


You have to love an article with a chemical equation in it:

CO2 + H2O + NaCl —> NaHCO3 + H2 + Cl2

That is how this Texas company hopes to ‘scrub’ carbon dioxide from emissions at plants.

Cost of sequestration of CO2? About $20 a ton.Not bad at all. And it is carbon negative, a necessity for any such process.

This chemistry is limited as it used sodium producing sodium bicarbonate. They hope to use another process involving calcium that could make limestone.

Limestone would be a phenomenal way to sequester carbon dioxide in an inert fashion. it is actually one way how nature does it.

We have a long way to go. The US alone produces over 6 billion tons of carbon dioxide a year. This approach can, at the moment, sequester 83,000.

Let’s hope the limestone route works out. That could do much, much more.