Energy efficient approach to co2 capture process

A system for capturing carbon dioxide including:

• a feed line transporting an exhaust gas;
• a first separator configured to draw liquid off the exhaust gas;
• a first compressor configured to compress the exhaust gas received from the first separator;
• a first membrane configured to separate the exhaust gas received from the first compressor into a retentate stream of exhaust gas and a permeate stream of exhaust gas wherein the permeate stream of exhaust gas includes a larger amount of carbon dioxide than the retentate stream of exhaust gas;
• a first ejector configured to compress the permeate stream of exhaust gas;
• a second separator configured to draw liquid off the exhaust gas received from the first ejector;
• a second compressor configured to further compress the exhaust gas received from the second separator;
• and
• a flow divider configured to divert the exhaust gas received from the second compressor to a carbon dioxide storage tank.

A method for capturing carbon dioxide from an exhaust gas including the steps of:

• transporting exhaust gas to a first separator;
• separating the exhaust gas at the first separator into a gas in a first gaseous path and a liquid in a first liquid path;
• compressing the exhaust gas from the first gaseous path at a first compressor;
• filtering the exhaust gas from the first compressor at a first membrane to separate the exhaust gas received into a retentate stream of exhaust gas and a permeate stream of exhaust gas wherein the permeate stream of exhaust gas includes a larger amount of carbon dioxide than the retentate stream of exhaust gas;
• compressing the exhaust gas from the permeate stream at a first ejector;
• separating the exhaust gas at a second separator into a gas in a second gaseous path and a liquid in a second liquid path;
• compressing the exhaust gas from the second gaseous path at a second compressor;
• and
• transporting a portion of the exhaust gas from the second compressor to a carbon dioxide storage tank.