Patent ID: 8641805

Claim:
A reactor including: first and second chambers, wherein the first chamber is defined by an inner wall formation and the second chamber is entirely or at least in part defined by an annular spacing between the inner wall formation and an outer wall formation arranged about or around the inner wall formation, the inner wall formation and the outer wall formation being concentrically arranged and said inner and outer walls are constructed from concrete or structural ceramics, wherein the first chamber includes an upper inlet supplying a liquid absorbent rich in carbon dioxide to an upper section of the first chamber, an upper outlet discharging gas phase highly concentrated in carbon dioxide from the first chamber, a lower outlet discharging the liquid absorbent lean in carbon dioxide from a lower region of the first chamber; wherein the second chamber includes an upper inlet supplying liquid absorbent lean in carbon dioxide to an upper section of the second chamber, the upper inlet being flow connected to the lower outlet of the first chamber, a lower inlet supplying gas phase rich in carbon dioxide to a lower section of the second chamber, a lower outlet discharging liquid absorbent that is rich in carbon dioxide from the second chamber and is flow connected to the upper inlet of the first chamber, and an outlet discharging a stream of gas lean in carbon dioxide; and wherein the inner and outer walls are constructed by assembling falsework that forms boundaries defining the inner and outer walls, and concrete or structural ceramic is poured into the falsework to form the wall.