I heard about a cryogenic process (CFZ) for separation of CO2 a few months back; this effort was being pioneered by ExxonMobil.

While at first sight it looks like an effective idea, I wonder how much it could cost given that it could take a considerable amount of energy to cryogenically cool the CO2. And how well the costs will compare to other separation / capture mechanisms such as the amine based capture mechanisms.

Any thoughts?

Here is a link that might be useful: Cryogenic CO2 Separation Process