Carbon capture system for production of soda ash, baking soda, methanol, & formaldehyde
AssigneeAgc Carbon Inc.
InventorSumeet Gandhi
Life of this patent
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Abstract
A carbon capture system is used to remove carbon dioxide from flue gas emissions. The system consists of a first scrubbing column, a carbonating tower, and a separation system. In the first scrubbing column, nitrates and sulfates are removed from the flue gas, producing a purified flue gas and a bottoms product containing the sulfates and nitrates. The purified flue gas is then transferred to a carbonating tower, where it is contacted with a solution (such as brine, ammonia, or a weak base) to remove carbon dioxide, producing a lean brine solution. The lean brine solution is then filtered to recover sodium bicarbonate or soda ash.
Claims20
A method comprising:
- receiving a flue gas at a carbon capture system, wherein the flue gas includes carbon dioxide, nitrogen, oxygen, nitrates and sulfates;
- introducing the flue gas into a first column of the carbon capture system, wherein the first column removes the nitrates and the sulfates from the flue gas creating a purified flue gas,
- removing, from the first column, the purified flue gas via an overhead stream;
- removing a bottoms product from the first column that includes the sulfates and nitrates from the flue gas;
- transferring the purified flue gas to a carbonating tower, wherein the carbonating tower has a top exit stream and a bottom exit stream;
- contacting, in the carbonating tower, the purified flue gas with at least one of a brine solution, ammonia, and a weak base to create at least a lean brine solution;
- transfer the lean brine solution from the bottom exit stream of the carbonating tower to a filter;
- and
- filtering, the lean brine solution to recover NaHCO3, wherein a primary source of carbon dioxide for the NaHCO3 is the purified flue gas.
A carbon capture system comprising:
- a first scrubbing column, wherein the first scrubbing column removes nitrates and sulfates from an input, wherein an overhead product from the first scrubbing column includes a flue gas after separation and a bottoms product from the first scrubbing column includes the sulfates and nitrates from the flue gas;
- a carbonating tower, wherein the carbonating tower removes carbon dioxide from the flue gas using at least ammonia, wherein a second overhead product from the carbonating tower includes oxygen, nitrogen and carbon monoxide and a second bottom from the carbonating tower includes a first lean caustic stream;
- and
- a separation system, wherein the separation system separates NaHCO3 from the second bottom, wherein a primary source of carbon dioxide for the NaHCO3 is the flue gas.
A carbon capture system comprising:
- a first scrubbing column, wherein the first scrubbing column removes nitrates and sulfates from an input, wherein an overhead product from the first scrubbing column includes a flue gas after separation and a bottoms product from the first scrubbing column includes the sulfates and nitrates from the flue gas;
- a carbonating tower, wherein the carbonating tower removes carbon dioxide from the flue gas using at least ammonia, wherein a second overhead product from the carbonating tower includes oxygen, nitrogen and carbon monoxide and a second bottom from the carbonating tower includes a first lean caustic stream;
- and
- a separation system, wherein the separation system separates Na2CO3 from the second bottom, wherein a primary source of carbon dioxide for the Na2CO3 is the flue gas.
Dependencies are inferred from the claim text.