Method for removal of carbon dioxide from a carrier liquid

A method of removing carbon dioxide from a carrier liquid comprising:

• providing a heat exchanger with a cooling side and a heating side to conduct a heat exchange process between the carrier liquid and a compressed carbon dioxide gas;
• the cooling side of the heat exchanger having a cooling input port and a cooling output port;
• the heating side of the heat exchanger having a heating input port and a heating output port;
• conveying the carrier liquid to the heating input port, the carrier liquid being at a first temperature and a first pressure where the carbon dioxide is a carbon dioxide liquid;
• heating the carrier liquid through the heat exchanger, causing the carbon dioxide and a portion of the carrier liquid to vaporize as the carrier liquid and the carbon dioxide are brought to a second temperature where the carbon dioxide vaporizes to a carbon dioxide gas;
• passing the carrier liquid and the carbon dioxide gas through the heating output port to a feed inlet of a liquid removal vessel;
• removing a carbon dioxide depleted carrier liquid from the bottom of the liquid removal vessel;
• compressing the carbon dioxide gas from the liquid removal vessel through a compression process by raising the carbon dioxide gas to a second pressure at which the carbon dioxide gas is now the compressed carbon dioxide gas;
• sending the compressed carbon dioxide gas to the cooling input port;
• and
• cooling the compressed carbon dioxide gas by the heat exchange process with the carrier liquid through the heat exchanger, bringing the compressed carbon dioxide gas to a third temperature, by which process the carbon dioxide gas cools to a pure carbon dioxide liquid;
• wherein, given a pressure-temperature curve for carbon dioxide, the first temperature and the first pressure are located in a liquid phase area of the pressure-temperature curve for carbon dioxide;
• the second temperature is shifted from the first temperature to the second temperature, the second temperature being higher than the first temperature, and the combination of the first pressure and the second temperature being located in a gas phase area of the pressure-temperature curve for carbon dioxide that also allows for the compression from the first pressure to the second pressure to keep the carbon dioxide gas as a gas;
• and the third temperature being lower than the second temperature, the third temperature and second pressure being in the liquid phase area;
• and,
• wherein the compression process is sized to allow the heat exchange process to be efficient by avoiding an inflection region that occurs between a heat-temperature curve of the cooling side of the heat exchanger and a heat-temperature curve of the heating side of the heat exchanger;
• whereby carbon dioxide is removed from the carrier liquid.