TECHNIQUES FOR BIOCATALYTIC TREATMENT OF CO2-CONTAINING GAS AND FOR SEPARATION OF BIOCATALYST FROM ION LOADED STREAMS

摘要

Various enzyme-enhanced CO2 capture techniques are described. In some implementations, a process for CO2 capture includes absorption and desorption stages, and a separation stage for removing at least a portion of the enzymes from the ion loaded solution. The enzyme-depleted solution is supplied to desorption, while the enzyme-enriched solution is recycled back into the absorption stage. A filtration membrane may be used for the separation stage. In some scenarios, the separation may provide the enzyme enriched solution with sufficient fluidity for liquid transport through a conduit back into the absorption stage. The separation may be conducted in accordance with a selected absorption compound, such as an amino or carbonate compound, such that the recycle flow of the enzyme-enriched solution is sufficiently low so that the enzyme-enhanced CO2 capture system maintains energy efficiency. Other techniques related to enzyme separation are described and can further improve CO2 capture.