US 12,533,652 B2 · Composition and process for capturing carbon dioxide

Abstract

A solid sorbent composition including calcium oxide, calcium aluminate, and a mixed metal oxide characterized by a perovskite crystalline structure, for example, lanthanum aluminate. The solid sorbent finds utility in capturing carbon dioxide from a gaseous stream containing carbon dioxide, such as emissions streams produced in combustion processes or streams derived from closed environments including airplanes, spaceships, and submarines. A reversible carbon dioxide process is disclosed involving (a) contacting a carbon dioxide-containing gaseous stream with the solid sorbent composition in a carbonator to produce a solid mixture containing calcium carbonate and a gaseous product stream reduced in carbon dioxide concentration; and (b) heating the solid mixture containing calcium carbonate in a calcinator (decarbonator) to regenerate the solid sorbent composition and produce a gaseous stream enriched in carbon dioxide.

Claims20

Dependent claims

A sorbent composition comprising calcium oxide, calcium aluminate, and lanthanum aluminate characterized by a perovskite crystalline structure, the sorbent composition being prepared by a process comprising:

(a) preparing a mixture of calcium oxide or a precursor thereof, calcium aluminate or a precursor thereof, and lanthanum aluminate having a perovskite crystalline structure or a precursor thereof;
(b) calcining the mixture under a dry gas to form a first calcined material;
(c) contacting the first calcined material with carbon dioxide in the presence of water vapor at a first temperature sufficient to form an at least partially carbon dioxide-saturated material;
(d) decarbonating the at least partially carbon dioxide-saturated material at a second temperature sufficient to remove the carbon dioxide and form a second calcined material;
(e) cooling the second calcined material to the first temperature;
and
(f) repeating steps (c) through (e) at least once so as to yield the sorbent composition.

4 more elements

Dependencies are inferred from the claim text.

Composition and process for capturing carbon dioxide

Life of this patent

Composition and process for capturing carbon dioxide

Life of this patent

Abstract

Claims20