Method to reduce energy costs for co2 capture by mineral looping

Abstract

A method for capturing and releasing carbon dioxide is provided. An alkaline earth metal hydroxide is contacted with a carbon dioxide-containing gas to form a basic alkaline earth metal carbonate having carbonate and hydroxide groups and optionally water of hydration. The basic carbonate is regenerated by contacting with heated steam to yield recycled hydroxide and a regeneration off-gas comprising carbon dioxide. Regeneration may be conducted at temperatures up to 300° C., including ≤250° C., optionally in a flowing system with an inlet for steam and an outlet for off-gas. The recycled hydroxide may be re-contacted with carbon dioxide for multiple cycles. The off-gas may be cooled, dried, compressed, and/or purified for storage in a storage vessel or geological injection.

Dependencies are inferred from the claim text.